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AUSCERT External Security Bulletin Redistribution
ESB-2018.1198
Security Bulletins - Cisco Adaptive Security Appliance
19 April 2018
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Adaptive Security Appliance
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Cross-site Scripting -- Remote with User Interaction
Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2018-0251 CVE-2018-0242 CVE-2018-0240
CVE-2018-0231 CVE-2018-0228 CVE-2018-0227
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asawvpn
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asawvpn2
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa_inspect
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa1
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa2
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa3
Comment: This bulletin contains six (6) Cisco Systems security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Adaptive Security Appliance WebVPN Cross-Site Scripting Vulnerability
Medium
Advisory ID: cisco-sa-20180418-asawvpn
First Published: 2018 April 18 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvg33985
CVSS Score: Base 6.1
CVSS: 3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:X/RL:X/RC:X
CVE-2018-0242
CWE-79
Summary
o A vulnerability in the WebVPN web-based management interface of Cisco
Adaptive Security Appliance could allow an unauthenticated, remote attacker
to conduct a cross-site scripting (XSS) attack against a user of the
web-based management interface of an affected device.
The vulnerability is due to insufficient validation of user-supplied input
by the web-based management interface of an affected device. An attacker
could exploit this vulnerability by persuading a user of the interface to
click a crafted link. A successful exploit could allow the attacker to
execute arbitrary script code in the context of the interface or allow the
attacker to access sensitive browser-based information.
There are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asawvpn
Affected Products
o Vulnerable Products
This vulnerability affects Cisco Adaptive Security Appliance. For
information about affected software releases, consult the Cisco bug ID(s)
at the top of this advisory.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
vulnerability.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o For information about fixed software releases, consult the Cisco bug ID(s)
at the top of this advisory.
When considering software upgrades, customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories and Alerts page, to determine exposure and a
complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o This vulnerability was found during the resolution of a Cisco TAC support
case.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy. This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
Subscribe to Cisco Security Notifications
o Subscribe
Action Links for This Advisory
o Understanding Cross-Site Scripting (XSS) Threat Vectors
Related to This Advisory
o Cross-Site Scripting
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asawvpn
Revision History
o +---------+--------------------------+---------+--------+----------------+
| Version | Description | Section | Status | Date |
+---------+--------------------------+---------+--------+----------------+
| 1.0 | Initial public release. | - | Final | 2018-April-18 |
+---------+--------------------------+---------+--------+----------------+
Legal Disclaimer
o THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND
OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT
OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES
THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information
or contain factual errors. The information in this document is intended for
end users of Cisco products.
- -------------------------------------------------------------------------------
Cisco Adaptive Security Appliance Clientless SSL VPN Cross-Site Scripting
Vulnerability
Medium
Advisory ID: cisco-sa-20180418-asawvpn2
First Published: 2018 April 18 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvh20742
CVSS Score: Base 6.1
CVSS: 3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:X/RL:X/RC:X
CVE-2018-0251
CWE-79
Summary
o A vulnerability in the Web Server Authentication Required screen of the
Clientless Secure Sockets Layer (SSL) VPN portal of Cisco Adaptive Security
Appliance (ASA) Software could allow an unauthenticated, remote attacker to
conduct a cross-site scripting (XSS) attack against a user of that portal
on an affected device.
The vulnerability is due to insufficient validation of user-supplied input
by the web-based interface of an affected device. An attacker could exploit
this vulnerability by persuading a user of the interface to click a crafted
link. A successful exploit could allow the attacker to execute arbitrary
script code in the context of the portal or allow the attacker to access
sensitive browser-based information.
There are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asawvpn2
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco products if they are running
a vulnerable release of Cisco ASA Software:
- 3000 Series Industrial Security Appliances
- Adaptive Security Virtual Appliance (ASAv)
- ASA 5500 Series Adaptive Security Appliances
- ASA 5500-X Series Next-Generation Firewalls
- ASA Services Module for Cisco Catalyst 6500 Series Switches
- ASA Services Module for Cisco 7600 Series Routers
For information about affected software releases, consult the Cisco bug ID
(s) at the top of this advisory.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
vulnerability.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o For information about fixed software releases, consult the Cisco bug ID(s)
at the top of this advisory.
When considering software upgrades, customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories and Alerts page, to determine exposure and a
complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o This vulnerability was found during the resolution of a Cisco TAC support
case.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy. This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
Subscribe to Cisco Security Notifications
o Subscribe
Action Links for This Advisory
o Understanding Cross-Site Scripting (XSS) Threat Vectors
Related to This Advisory
o Cross-Site Scripting
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asawvpn2
Revision History
o +---------+--------------------------+---------+--------+----------------+
| Version | Description | Section | Status | Date |
+---------+--------------------------+---------+--------+----------------+
| 1.0 | Initial public release. | - | Final | 2018-April-18 |
+---------+--------------------------+---------+--------+----------------+
Legal Disclaimer
o THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND
OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT
OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES
THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information
or contain factual errors. The information in this document is intended for
end users of Cisco products.
- -------------------------------------------------------------------------------
Cisco Adaptive Security Appliance Application Layer Protocol Inspection Denial
of Service Vulnerabilities
High
Advisory ID: cisco-sa-20180418-asa_inspect
First Published: 2018 April 18 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCve61540
CSCvh23085
CSCvh95456
CVSS Score: Base 8.6
CVSS: 3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
CVE-2018-0240
CWE-399
Summary
o Multiple vulnerabilities in the Application Layer Protocol Inspection
feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco
Firepower Threat Defense (FTD) Software could allow an unauthenticated,
remote attacker to trigger a reload of an affected device, resulting in a
denial of service (DoS) condition.
The vulnerabilities are due to logical errors during traffic inspection. An
attacker could exploit these vulnerabilities by sending a high volume of
malicious traffic across an affected device. An exploit could allow the
attacker to cause a deadlock condition, resulting in a reload of an
affected device.
Cisco has released software updates that address these vulnerabilities.
There are no workarounds that address these vulnerabilities.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa_inspect
Affected Products
o Vulnerable Products
These vulnerabilities affect Cisco ASA Software and Cisco FTD Software
configured for Application Layer Protocol Inspection running on the
following Cisco products.
- 3000 Series Industrial Security Appliance (ISA)
- ASA 5500 Series Adaptive Security Appliances
- ASA 5500-X Series Next-Generation Firewalls
- ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco
7600 Series Routers
- Adaptive Security Virtual Appliance (ASAv)
- Firepower 2100 Series Security Appliance
- Firepower 4100 Series Security Appliance
- Firepower 9300 ASA Security Module
- FTD Virtual (FTDv)
Application Layer Protocol Inspection is enabled in Cisco ASA Software and
Cisco FTD Software by default. Refer to the Cisco ASA Series Firewall CLI
Configuration Guide for details on the default application inspection
policy.
ASA Software
Cisco ASA Software is only vulnerable if running software release 9.6 or
later.
Determining the Cisco ASA Software Release
To determine whether a vulnerable version of Cisco ASA Software is running
on a device, administrators can use the show version command in the CLI.
The following example shows the output of the command for a device that is
running Cisco ASA Software Release 9.7(1)4:
ciscoasa# show version | include Version
Cisco Adaptive Security Appliance Software Version 9.7(1)4
Firepower Extensible Operating System Version 2.1(1.66)
Baseboard Management Controller (revision 0x1) Firmware Version: 2.4
Customers who use Cisco Adaptive Security Device Manager (ASDM) to manage
devices can locate the software release in the table that appears in the
login window or the upper-left corner of the Cisco ASDM window.
FTD Software
Cisco FTD Software is only vulnerable if running software release 6.1.0 or
later.
Determining the Cisco FTD Software Release
To determine which Cisco FTD Software release is running on a device,
administrators can log in to the device and use the show version command in
the CLI. The following example shows the output of the command for a device
that is running Cisco FTD Software Release 6.2.2:
> show version
------------------[ ftd ]-----------------------
Model : Cisco Firepower 2130 Threat Defense (77) Version 6.2.2 (Build 81)
UUID : 0cd3595a-7efa-11e7-aaa1-ee3989c8bf25
Rules update version : 2017-12-20-001-vrt
VDB version : 290
----------------------------------------------------
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these
vulnerabilities.
Workarounds
o There are no workarounds that address these vulnerabilities.
Fixed Software
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license:
https://www.cisco.com/c/en/us/products/end-user-license-agreement.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades, customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories and Alerts page, to determine exposure and a
complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC:
https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Fixed Releases
Customers should upgrade to an appropriate release as indicated in the
table(s) in this section. To help ensure a complete upgrade solution,
consider that this advisory is part of a collection that includes the
following advisories:
- cisco-sa-20180418-asa1: Cisco Adaptive Security Appliance SSL
Certificate Bypass Vulnerability
- cisco-sa-20180418-asa2: Cisco Adaptive Security Appliance Flow Creation
Denial of Service Vulnerability
- cisco-sa-20180418-asa3: Cisco Adaptive Security Appliance TLS Denial of
Service Vulnerability
- cisco-sa-20180418-asaanyconnect: Cisco ASA Software, FTD Software, and
AnyConnect Secure Mobility Client SAML Authentication Session Fixation
Vulnerability
- cisco-sa-20180418-asa_inspect: Cisco Adaptive Security Appliance
Application Layer Protocol Inspection Denial of Service Vulnerability
In the following table(s), the left column lists major releases of Cisco
software. The center column indicates whether a major release is affected
by the vulnerability described in this advisory and the first minor release
that includes the fix for this vulnerability. The right column indicates
whether a major release is affected by all the vulnerabilities described in
this collection of advisories and the current recommended release for those
vulnerabilities.
ASA Software
Cisco ASA First Fixed Release Recommended Fixed Release for All the
Major for These Vulnerabilities Described in this
Release Vulnerabilities Collection of Advisories
Prior to Not vulnerable 9.1.7.20
9.1^1
9.1 Not vulnerable 9.1.7.20
9.2 Not vulnerable 9.2.4.27
9.3^1 Not vulnerable 9.4.4.14
9.4 Not vulnerable 9.4.4.14
9.5^1 Not vulnerable 9.6.4.6
9.6 9.6.4.6 9.6.4.6
9.7 9.7.1.24 9.7.1.24
9.8 9.8.2.24 9.8.2.28
9.9 9.9.1.4 9.9.2.1
^1 Cisco ASA Software releases prior to 9.1 and ASA releases 9.3 and 9.5
have reached End of Software Maintenance. Customers should migrate to a
supported release.
The software is available for download from Cisco Software Center by
navigating to Products > Security > Firewalls > Adaptive Security
Appliances (ASA) > ASA 5500-X Series Firewalls where there is a list of ASA
hardware platforms. The majority of these software releases are listed
under Interim.
FTD Software
Cisco Recommended Fixed Release for All the
FTD First Fixed Release for These Vulnerabilities Described in this Collection of
Major Vulnerabilities Advisories
Release
6.0 Not vulnerable Cisco_FTD_SSP_Hotfix_EI-6.1.0.7-2.sh (41xx and
9300 FTD hardware platform)
Cisco_FTD_Hotfix_EI-6.1.0.7-2.sh (All FTD
hardware platforms except 41xx and 9300)
Cisco_FTD_SSP_Hotfix_EI-6.1.0.7-2.sh (41xx and
9300 FTD hardware platform)
6.0.1 Not vulnerable
Cisco_FTD_Hotfix_EI-6.1.0.7-2.sh (All FTD
hardware platforms except 41xx and 9300)
Cisco_FTD_SSP_Hotfix_EI-6.1.0.7-2.sh
(41xx and 9300 FTD hardware Cisco_FTD_SSP_Hotfix_EI-6.1.0.7-2.sh (41xx and
platform) 9300 FTD hardware platform)
6.1.0
Cisco_FTD_Hotfix_EI-6.1.0.7-2.sh Cisco_FTD_Hotfix_EI-6.1.0.7-2.sh (All FTD
(All FTD hardware platforms except hardware platforms except 41xx and 9300)
41xx and 9300)
6.2.0 6.2.0.5 6.2.0.5
6.2.1 Migrate to 6.2.2.2 Cisco_FTD_SSP_Hotfix_BD-6.2.2.3-4.sh.REL.tar
(41xx and 9300 FTD hardware platforms)
Cisco_FTD_SSP_FP2K_Hotfix_BD-6.2.2.3-4.sh.REL.tar
(21xx FTD hardware platform)
Cisco_FTD_Hotfix_BD-6.2.2.3-4.sh.REL.tar (All
other FTD hardware platforms)
Cisco_FTD_SSP_Hotfix_BD-6.2.2.3-4.sh.REL.tar
(41xx and 9300 FTD hardware platforms)
6.2.2 6.2.2.2 Cisco_FTD_SSP_FP2K_Hotfix_BD-6.2.2.3-4.sh.REL.tar
(21xx FTD hardware platform)
Cisco_FTD_Hotfix_BD-6.2.2.3-4.sh.REL.tar (All
other FTD hardware platforms)
Cisco_FTD_SSP_Hotfix_A-6.2.3.1-10.sh.REL.tar
(41xx and 9300 FTD hardware platforms)
6.2.3 Not vulnerable Cisco_FTD_SSP_FP2K_Hotfix_A-6.2.3.1-10.sh.REL.tar
(21xx FTD hardware platform)
Cisco_FTD_Hotfix_A-6.2.3.1-10.sh.REL.tar (All
other FTD hardware platforms)
The software is available for download from Cisco Software Center by
navigating to Products > Security > Firewalls> Next-Generation Firewalls
(NGFW) where there is a list of possible FTD hardware platforms.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o These vulnerabilities were found during the resolution of Cisco TAC support
cases.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy. This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
Subscribe to Cisco Security Notifications
o Subscribe
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa_inspect
Revision History
o +---------+--------------------------+---------+--------+----------------+
| Version | Description | Section | Status | Date |
+---------+--------------------------+---------+--------+----------------+
| 1.0 | Initial public release. | -- | Final | 2018-April-18 |
+---------+--------------------------+---------+--------+----------------+
Legal Disclaimer
o THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND
OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT
OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES
THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information
or contain factual errors. The information in this document is intended for
end users of Cisco products.
- -------------------------------------------------------------------------------
Cisco Adaptive Security Appliance Virtual Private Network SSL Client
Certificate Bypass Vulnerability
High
Advisory ID: cisco-sa-20180418-asa1
First Published: 2018 April 18 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvg40155
CVSS Score: Base 7.5
CVSS: 3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:X/RL:X/RC:X
CVE-2018-0227
Summary
o A vulnerability in the Secure Sockets Layer (SSL) Virtual Private Network
(VPN) Client Certificate Authentication feature for Cisco Adaptive Security
Appliance (ASA) could allow an unauthenticated, remote attacker to
establish an SSL VPN connection and bypass certain SSL certificate
verification steps.
The vulnerability is due to incorrect verification of the SSL Client
Certificate. An attacker could exploit this vulnerability by connecting to
the ASA VPN without a proper private key and certificate pair. A successful
exploit could allow the attacker to establish an SSL VPN connection to the
ASA when the connection should have been rejected.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa1
Affected Products
o Vulnerable Products
This vulnerability affects Cisco Adaptive Security Appliance (ASA) and
Firepower Threat Defense (FTD) Software that is running on the following
Cisco products:
- 3000 Series Industrial Security Appliances (ISA)
- ASA 5500 Series Adaptive Security Appliances
- ASA 5500-X Series Next-Generation Firewalls
- ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco
7600 Series Routers
- Adaptive Security Virtual Appliances (ASAv)
- Firepower 4110 Security Appliances
- Firepower 9300 ASA Security Modules
To be considered vulnerable, the ASA or FTD has to be configured for Client
Certificate Authentication. Administrators can check for a vulnerable
configuration using the show running-config tunnel-group | include
authentication | include certificate command. If either the authentication
certificate or authentication multiple-certificate configuration option is
present in the configuration then the device is vulnerable. The following
is an example of a vulnerable configuration:
asa# show running-config tunnel-group | include authentication | include certificate
authentication certificate
authentication multiple-certificate
Vulnerable ASA Software
ASA Software is only vulnerable if running one of the following software
versions:
Release 9.4
ASA software versions 9.4.3.1, 9.4.3.2 and 9.4.4 through 9.4.4.13
Release 9.5
ASA software versions 9.5.2.7, 9.5.2.8 and 9.5.3.7 through 9.5.3.9
Release 9.6
ASA software versions 9.6.2.9 through 9.6.2.21 and 9.6.3 through 9.6.3.17
Determining the ASA Software Release
To determine whether a vulnerable version of Cisco ASA Software is running
on a device, administrators can use the show version | include Version
command in the CLI. The following example shows the output of the command
for a device that is running Cisco ASA Software Release 9.4(4):
ciscoasa# show version | include Version
Cisco Adaptive Security Appliance Software Version 9.4(4)
Device Manager Version 7.4(1)
Customers who use Cisco Adaptive Security Device Manager (ASDM) to manage
devices can locate the software release in the table that appears in the
login window or the upper-left corner of the Cisco ASDM window.
Vulnerable FTD Software
FTD software is only vulnerable if running one of the following software
versions:
Release 6.0
FTD software versions 6.0 through 6.0.1.4.
Release 6.1
FTD software versions 6.1.0 through 6.1.0.5.
Determining the Running FTD Software Release
Administrators can use the show versionCLI command to determine the FTD
release. In this example, the device is running software release 6.1.0.
> show version
---------------------[ ftd ]---------------------
Model : Cisco ASA5525-X Threat Defense (75) Version 6.1.0 (Build 362)
UUID : 2849ba3c-ecb8-11e6-98ca-b9fc2975893c
Rules update version : 2017-03-15-001-vrt
VDB version : 279
----------------------------------------------------
Products Confirmed Not Vulnerable
Cisco has confirmed that this vulnerability does not affect Firepower 2100
Series Security Appliances.
No other Cisco products are currently known to be affected by this
vulnerability.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license: http://www.cisco.com/en/US/docs/general/warranty/English/
EU1KEN_.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades, customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories and Alerts page, to determine exposure and a
complete upgrade solution.
In all cases, customers should ensure that the devices to upgrade contain
sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC: http://www.cisco.com/en
/US/support/tsd_cisco_worldwide_contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Fixed Releases
Customers should upgrade to an appropriate release as indicated in the
table(s) in this section. To help ensure a complete upgrade solution,
consider that this advisory is part of a collection that includes the
following advisories:
- cisco-sa-20180418-asa1: Cisco Adaptive Security Appliance SSL
Certificate Bypass Vulnerability
- cisco-sa-20180418-asa2: Cisco Adaptive Security Appliance Flow Creation
Denial of Service Vulnerability
- cisco-sa-20180418-asa3: Cisco Adaptive Security Appliance TLS Denial of
Service Vulnerability
- cisco-sa-20180418-asaanyconnect: Cisco ASA Software, FTD Software, and
AnyConnect Secure Mobility Client SAML Authentication Session Fixation
Vulnerability
- cisco-sa-20180418-asa_inspect: Cisco Adaptive Security Appliance
Application Layer Protocol Inspection Denial of Service Vulnerability
In the following table(s), the left column lists major releases of Cisco
software. The center column indicates whether a major release is affected
by the vulnerability described in this advisory and the first minor release
that includes the fix for this vulnerability. The right column indicates
whether a major release is affected by all the vulnerabilities described in
this collection of advisories and the current recommended release for those
vulnerabilities.
ASA Software
+---------------+----------------------------+-----------------------------------------------------+
| Cisco ASA | Recommended Fixed Release | Recommended Fixed Release for All the |
| Major | for This Vulnerability | Vulnerabilities Described in the Collection of |
| Release | | Advisories |
+---------------+----------------------------+-----------------------------------------------------+
| Prior to 9.1^ | Not vulnerable | 9.1.7.20 |
| 1 | | |
+---------------+----------------------------+-----------------------------------------------------+
| 9.1 | Not vulnerable | 9.1.7.20 |
+---------------+----------------------------+-----------------------------------------------------+
| 9.2 | Not vulnerable | 9.2.4.27 |
+---------------+----------------------------+-----------------------------------------------------+
| 9.3^1 | Not vulnerable | 9.4.4.14 |
+---------------+----------------------------+-----------------------------------------------------+
| 9.4 | 9.4.4.14 or later | 9.4.4.14 |
+---------------+----------------------------+-----------------------------------------------------+
| 9.5^1 | Migrate to 9.6.3.20 | 9.6.4.6 |
+---------------+----------------------------+-----------------------------------------------------+
| 9.6 | 9.6.3.20 or later | 9.6.4.6 |
+---------------+----------------------------+-----------------------------------------------------+
| 9.7 | Not vulnerable | 9.7.1.24 |
+---------------+----------------------------+-----------------------------------------------------+
| 9.8 | Not vulnerable | 9.8.2.28 |
+---------------+----------------------------+-----------------------------------------------------+
| 9.9 | Not vulnerable | 9.9.2.1 |
+---------------+----------------------------+-----------------------------------------------------+
^1Cisco ASA Software releases prior to 9.1 and ASA releases 9.3 and 9.5
have reached End of Software Maintenance. Customers should migrate to a
supported release.
The software is available for download from Cisco Software Center by
navigating to Products > Security > Firewalls > Adaptive Security
Appliances (ASA) > ASA 5500-X Series Firewalls where there is a list of ASA
hardware platforms. The majority of these software releases are listed
under Interim.
FTD Software
+---------------+-----------------------------+----------------------------------------------------+
| Cisco FTD | Recommended Fixed Release | Recommended Fixed Release for All the |
| Major | for This Vulnerability | Vulnerabilities Described in the Collection of |
| Release | | Advisories |
+---------------+-----------------------------+----------------------------------------------------+
| | | Cisco_FTD_SSP_Hotfix_EI-6.1.0.7-2.sh (41xx and |
| | | 9300 FTD hardware platform) |
| 6.0 | Migrate to 6.1.0.6 | |
| | | Cisco_FTD_Hotfix_EI-6.1.0.7-2.sh (All FTD hardware |
| | | platforms except 41xx and 9300) |
+---------------+-----------------------------+----------------------------------------------------+
| | | Cisco_FTD_SSP_Hotfix_EI-6.1.0.7-2.sh (41xx and |
| | | 9300 FTD hardware platform) |
| 6.0.1 | Migrate to 6.1.0.6 | |
| | | Cisco_FTD_Hotfix_EI-6.1.0.7-2.sh (All FTD hardware |
| | | platforms except 41xx and 9300) |
+---------------+-----------------------------+----------------------------------------------------+
| | | Cisco_FTD_SSP_Hotfix_EI-6.1.0.7-2.sh (41xx and |
| | | 9300 FTD hardware platform) |
| 6.1.0 | 6.1.0.6 or later | |
| | | Cisco_FTD_Hotfix_EI-6.1.0.7-2.sh (All FTD hardware |
| | | platforms except 41xx and 9300) |
+---------------+-----------------------------+----------------------------------------------------+
| 6.2.0 | Not vulnerable | 6.2.0.5 |
+---------------+-----------------------------+----------------------------------------------------+
| | | Cisco_FTD_SSP_Hotfix_BD-6.2.2.3-4.sh.REL.tar (41xx |
| | | and 9300 FTD hardware platforms) |
| | | |
| 6.2.1 | Not vulnerable | Cisco_FTD_SSP_FP2K_Hotfix_BD-6.2.2.3-4.sh.REL.tar |
| | | (21xx FTD hardware platform) |
| | | |
| | | Cisco_FTD_Hotfix_BD-6.2.2.3-4.sh.REL.tar (All |
| | | other FTD hardware platforms) |
+---------------+-----------------------------+----------------------------------------------------+
| | | Cisco_FTD_SSP_Hotfix_BD-6.2.2.3-4.sh.REL.tar (41xx |
| | | and 9300 FTD hardware platforms) |
| | | |
| 6.2.2 | Not vulnerable | Cisco_FTD_SSP_FP2K_Hotfix_BD-6.2.2.3-4.sh.REL.tar |
| | | (21xx FTD hardware platform) |
| | | |
| | | Cisco_FTD_Hotfix_BD-6.2.2.3-4.sh.REL.tar (All |
| | | other FTD hardware platforms) |
+---------------+-----------------------------+----------------------------------------------------+
| | | Cisco_FTD_SSP_Hotfix_A-6.2.3.1-10.sh.REL.tar (41xx |
| | | and 9300 FTD hardware platforms) |
| | | |
| 6.2.3 | Not vulnerable | Cisco_FTD_SSP_FP2K_Hotfix_A-6.2.3.1-10.sh.REL.tar |
| | | (21xx FTD hardware platform) |
| | | |
| | | Cisco_FTD_Hotfix_A-6.2.3.1-10.sh.REL.tar (All |
| | | other FTD hardware platforms) |
+---------------+-----------------------------+----------------------------------------------------+
The software is available for download from Cisco Software Center by
navigating to Products > Security > Firewalls> Next-Generation Firewalls
(NGFW) where there is a list of FTD hardware platforms.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o This vulnerability was resolved during resolution of a Cisco TAC Support
case.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy. This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
Subscribe to Cisco Security Notifications
o Subscribe
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa1
Revision History
o +---------+--------------------------+---------+--------+----------------+
| Version | Description | Section | Status | Date |
+---------+--------------------------+---------+--------+----------------+
| 1.0 | Initial public release | - | Final | 2018-April-18 |
+---------+--------------------------+---------+--------+----------------+
Legal Disclaimer
o THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND
OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT
OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES
THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information
or contain factual errors. The information in this document is intended for
end users of Cisco products.
- -------------------------------------------------------------------------------
Cisco Adaptive Security Appliance Flow Creation Denial of Service Vulnerability
High
Advisory ID: cisco-sa-20180418-asa2
First Published: 2018 April 18 16:00 GMT
Version 1.0: Final
Workarounds: Yes
Cisco Bug IDs: CSCvf63718
CVSS Score: Base 8.6
CVSS: 3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
CVE-2018-0228
Summary
o A vulnerability in the ingress flow creation functionality of Cisco
Adaptive Security Appliance (ASA) could allow an unauthenticated, remote
attacker to cause the CPU to increase upwards of 100% utilization, causing
a denial of service (DoS) condition on an affected system.
The vulnerability is due to incorrect handling of an internal software lock
that could prevent other system processes from getting CPU cycles, causing
a high CPU condition. An attacker could exploit this vulnerability by
sending a steady stream of malicious IP packets that can cause connections
to be created on the targeted device. A successful exploit could allow the
attacker to exhaust CPU resources, resulting in a DoS condition during
which traffic through the device could be delayed. This vulnerability
applies to either IPv4 or IPv6 ingress traffic.
Cisco has released software updates that address this vulnerability. There
are workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa2
Affected Products
o Vulnerable Products
This vulnerability affects Cisco Adaptive Security Appliance (ASA) and
Firepower Threat Defense (FTD) Software that is running on the following
Cisco products:
- 3000 Series Industrial Security Appliances (ISA)
- ASA 5500 Series Adaptive Security Appliances
- ASA 5500-X Series Next-Generation Firewalls
- ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco
7600 Series Routers
- Adaptive Security Virtual Appliances (ASAv)
- Firepower 2100 Series Security Appliances
- Firepower 4110 Security Appliances
- Firepower 9300 ASA Security Modules
For information about which software releases are vulnerable, see the Fixed
Software section of this advisory.
Determining the ASA Software Release
To determine whether a vulnerable version of Cisco ASA Software is running
on a device, administrators can use the show version | include Version
command in the CLI. The following example shows the output of the command
for a device that is running Cisco ASA Software Release 9.4(4):
ciscoasa# show version | include Version
Cisco Adaptive Security Appliance Software Version 9.4(4)
Device Manager Version 7.4(1)
Customers who use Cisco Adaptive Security Device Manager (ASDM) to manage
devices can locate the software release in the table that appears in the
login window or the upper-left corner of the Cisco ASDM window.
Determining the Cisco Firepower System Software Release
To determine which Cisco Firepower System Software release is running on a
device, administrators can log in to the device and use the show version
command in the CLI. The following example shows the output of the command
for a device that is running Release 6.2.0:
> show version
---------------------[ ftd ]---------------------
Model : Cisco ASA5525-X Threat Defense (75) Version 6.2.0 (Build 362)
UUID : 2849ba3c-ecb8-11e6-98ca-b9fc2975893c
Rules update version : 2017-03-15-001-vrt
VDB version : 279
----------------------------------------------------
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
vulnerability.
Workarounds
o The ASA and FTD configuration commands, set connection
per-client-embryonic-max (TCP) and set connection per-client-max (non-TCP
protocols), can be configured to limit the number of connection requests
allowed. Using these configuration parameters can reduce the number of
connections and greatly reduce the impact of the DoS attack.
Fixed Software
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license: http://www.cisco.com/en/US/docs/general/warranty/English/
EU1KEN_.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades, customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories and Alerts page, to determine exposure and a
complete upgrade solution.
In all cases, customers should ensure that the devices to upgrade contain
sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC: http://www.cisco.com/en
/US/support/tsd_cisco_worldwide_contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Fixed Releases
Customers should upgrade to an appropriate release as indicated in the
table(s) in this section. To help ensure a complete upgrade solution,
consider that this advisory is part of a collection that includes the
following advisories:
- cisco-sa-20180418-asa1: Cisco Adaptive Security Appliance SSL
Certificate Bypass Vulnerability
- cisco-sa-20180418-asa2: Cisco Adaptive Security Appliance Flow Creation
Denial of Service Vulnerability
- cisco-sa-20180418-asa3: Cisco Adaptive Security Appliance TLS Denial of
Service Vulnerability
- cisco-sa-20180418-asaanyconnect: Cisco ASA Software, FTD Software, and
AnyConnect Secure Mobility Client SAML Authentication Session Fixation
Vulnerability
- cisco-sa-20180418-asa_inspect: Cisco Adaptive Security Appliance
Application Layer Protocol Inspection Denial of Service Vulnerability
In the following table(s), the left column lists major releases of Cisco
software. The center column indicates whether a major release is affected
by the vulnerability described in this advisory and the first minor release
that includes the fix for this vulnerability. The right column indicates
whether a major release is affected by all the vulnerabilities described in
this collection of advisories and the current recommended release for those
vulnerabilities.
ASA Software
+-----------------+----------------------------+-----------------------------------------------------------+
| Cisco ASA Major | First Fixed Release for | Recommended Fixed Release for All the Vulnerabilities |
| Release | This Vulnerability | Described in the Collection of Advisories |
+-----------------+----------------------------+-----------------------------------------------------------+
| Prior to 9.1^1 | Migrate to 9.1.7.20 | 9.1.7.20 |
+-----------------+----------------------------+-----------------------------------------------------------+
| 9.1 | 9.1.7.20 | 9.1.7.20 |
+-----------------+----------------------------+-----------------------------------------------------------+
| 9.2 | 9.2.4.27 | 9.2.4.27 |
+-----------------+----------------------------+-----------------------------------------------------------+
| 9.3^1 | Migrate to 9.4.4.13 | 9.4.4.14 |
+-----------------+----------------------------+-----------------------------------------------------------+
| 9.4 | 9.4.4.13 | 9.4.4.14 |
+-----------------+----------------------------+-----------------------------------------------------------+
| 9.5^1 | Migrate to 9.6.3.17 | 9.6.4.6 |
+-----------------+----------------------------+-----------------------------------------------------------+
| 9.6 | 9.6.3.17 | 9.6.4.6 |
+-----------------+----------------------------+-----------------------------------------------------------+
| 9.7 | 9.7.1.16 | 9.7.1.24 |
+-----------------+----------------------------+-----------------------------------------------------------+
| 9.8 | 9.8.2.14 | 9.8.2.28 |
+-----------------+----------------------------+-----------------------------------------------------------+
| 9.9 | 9.9.1 | 9.9.2.1 |
+----------------------------------------------------------------------------------------------------------+
^1Cisco ASA Software releases prior to 9.1 and ASA releases 9.3 and 9.5
have reached End of Software Maintenance. Customers should migrate to a
supported release.
The software is available for download from Cisco Software Center by
navigating to Products > Security > Firewalls > Adaptive Security
Appliances (ASA) > ASA 5500-X Series Firewalls where there is a list of ASA
hardware platforms. The majority of these software releases are listed
under Interim.
FTD Software
+---------------+-----------------------------+----------------------------------------------------+
| Cisco FTD | Recommended Fixed Release | Recommended Fixed Release for All the |
| Major | for This Vulnerability | Vulnerabilities Described in the Collection of |
| Release | | Advisories |
+---------------+-----------------------------+----------------------------------------------------+
| | | Cisco_FTD_SSP_Hotfix_EI-6.1.0.7-2.sh (41xx and |
| | | 9300 FTD hardware platform) |
| 6.0 | Migrate to 6.1.0.6 or later | |
| | | Cisco_FTD_Hotfix_EI-6.1.0.7-2.sh (All FTD hardware |
| | | platforms except 41xx and 9300) |
+---------------+-----------------------------+----------------------------------------------------+
| | | Cisco_FTD_SSP_Hotfix_EI-6.1.0.7-2.sh (41xx and |
| | | 9300 FTD hardware platform) |
| 6.0.1 | Migrate to 6.1.0.6 or later | |
| | | Cisco_FTD_Hotfix_EI-6.1.0.7-2.sh (All FTD hardware |
| | | platforms except 41xx and 9300) |
+---------------+-----------------------------+----------------------------------------------------+
| | | Cisco_FTD_SSP_Hotfix_EI-6.1.0.7-2.sh (41xx and |
| | | 9300 FTD hardware platform) |
| 6.1.0 | 6.1.0.6 | |
| | | Cisco_FTD_Hotfix_EI-6.1.0.7-2.sh (All FTD hardware |
| | | platforms except 41xx and 9300) |
+---------------+-----------------------------+----------------------------------------------------+
| 6.2.0 | 6.2.0.5 | 6.2.0.5 |
+---------------+-----------------------------+----------------------------------------------------+
| | | Cisco_FTD_SSP_Hotfix_BD-6.2.2.3-4.sh.REL.tar (41xx |
| | | and 9300 FTD hardware platforms) |
| | | |
| 6.2.1 | Migrate to 6.2.2.2 | Cisco_FTD_SSP_FP2K_Hotfix_BD-6.2.2.3-4.sh.REL.tar |
| | | (21xx FTD hardware platform) |
| | | |
| | | Cisco_FTD_Hotfix_BD-6.2.2.3-4.sh.REL.tar (All |
| | | other FTD hardware platforms) |
+---------------+-----------------------------+----------------------------------------------------+
| | | Cisco_FTD_SSP_Hotfix_BD-6.2.2.3-4.sh.REL.tar (41xx |
| | | and 9300 FTD hardware platforms) |
| | | |
| 6.2.2 | 6.2.2.2 | Cisco_FTD_SSP_FP2K_Hotfix_BD-6.2.2.3-4.sh.REL.tar |
| | | (21xx FTD hardware platform) |
| | | |
| | | Cisco_FTD_Hotfix_BD-6.2.2.3-4.sh.REL.tar (All |
| | | other FTD hardware platforms) |
+---------------+-----------------------------+----------------------------------------------------+
| | | Cisco_FTD_SSP_Hotfix_A-6.2.3.1-10.sh.REL.tar (41xx |
| | | and 9300 FTD hardware platforms) |
| | | |
| 6.2.3 | Not vulnerable | Cisco_FTD_SSP_FP2K_Hotfix_A-6.2.3.1-10.sh.REL.tar |
| | | (21xx FTD hardware platform) |
| | | |
| | | Cisco_FTD_Hotfix_A-6.2.3.1-10.sh.REL.tar (All |
| | | other FTD hardware platforms) |
+---------------+-----------------------------+----------------------------------------------------+
The software is available for download from Cisco Software Center by
navigating to Products > Security > Firewalls> Next-Generation Firewalls
(NGFW) where there is a list of possible FTD hardware platforms.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o This vulnerability was found during resolution of a Cisco TAC support case.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy. This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
Subscribe to Cisco Security Notifications
o Subscribe
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa2
Revision History
o +---------+--------------------------+---------+--------+----------------+
| Version | Description | Section | Status | Date |
+---------+--------------------------+---------+--------+----------------+
| 1.0 | Initial public release. | - | Final | 2018-April-18 |
+---------+--------------------------+---------+--------+----------------+
Legal Disclaimer
o THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND
OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT
OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES
THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information
or contain factual errors. The information in this document is intended for
end users of Cisco products.
- -------------------------------------------------------------------------------
Cisco Adaptive Security Appliance TLS Denial of Service Vulnerability
High
Advisory ID: cisco-sa-20180418-asa3
First Published: 2018 April 18 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCve18902
CSCve34335
CSCve38446
CVSS Score: Base 8.6
CVSS: 3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
CVE-2018-0231
CWE-20
Summary
o A vulnerability in the Transport Layer Security (TLS) library of Cisco
Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat
Defense (FTD) Software could allow an unauthenticated, remote attacker to
trigger a reload of the affected device, resulting in a denial of service
(DoS) condition.
The vulnerability is due to insufficient validation of user-supplied input.
An attacker could exploit this vulnerability by sending a malicious TLS
message to an interface enabled for Secure Layer Socket (SSL) services on
an affected device. Messages using SSL Version 3 (SSLv3) or SSL Version 2
(SSLv2) cannot be be used to exploit this vulnerability. An exploit could
allow the attacker to cause a buffer underflow, triggering a crash on an
affected device.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa3
Affected Products
o Vulnerable Products
This vulnerability affects Cisco ASA Software and Cisco FTD Software that
is running on the following Cisco products:
- Adaptive Security Virtual Appliance (ASAv)
- Firepower Threat Defense Virtual (FTDv)
- Firepower 2100 Series Security Appliance
ASA Software
Cisco ASA Software is only vulnerable if running software version 9.2 or
later.
In the following table, the left column lists the vulnerable Cisco ASA
features. The right column indicates the vulnerable configuration from the
CLI command show running-config, if it can be determined.
Feature Vulnerable Configuration
http server enable <port>
Adaptive Security Device Manager http <remote_ip_address>
(ASDM)^1 <remote_subnet_mask>
<interface_name>
AnyConnect SSL VPN webvpn
enable <interface_name>
http server enable <port>
Cisco Security Manager^2 http <remote_ip_address>
<remote_subnet_mask>
<interface_name>
Clientless SSL VPN webvpn
enable <interface_name>
webvpn
mus password <password>
Mobile User Security (MUS) mus server enable port <port #>
mus <address> <mask>
<interface_name>
Security Assertion Markup Language N/A
(SAML) Single Sign-On (SSO)^3
^1 ASDM is vulnerable only from an IP address in the configured http
command range.
^2 Cisco Security Manager is vulnerable only from an IP address in the
configured http command range.
^3 SAML SSO is first supported as of software release 9.6.
Determining the Cisco ASA Software Release
To determine whether a vulnerable version of Cisco ASA Software is running
on a device, administrators can use the show version command in the CLI.
The following example shows the output of the command for a device that is
running Cisco ASA Software Release 9.7(1)4:
ciscoasa# show version | include Version
Cisco Adaptive Security Appliance Software Version 9.7(1)4
Firepower Extensible Operating System Version 2.1(1.66)
Baseboard Management Controller (revision 0x1) Firmware Version: 2.4
Customers who use Cisco Adaptive Security Device Manager (ASDM) to manage
devices can locate the software release in the table that appears in the
login window or the upper-left corner of the Cisco ASDM window.
FTD Software
The FTD Software is only vulnerable if running software versions 6.0,
6.0.1, 6.1.0, 6.2.1, or 6.2.2 prior to their respective first fixed
releases.
In the following table, the left column lists the vulnerable Cisco FTD
features. The right column indicates the vulnerable configuration from the
CLI command show running-config, if it can be determined.
Feature Vulnerable Configuration
HTTP Service http server enable <port #>
enabled^1 http <remote_ip_address> <remote_subnet_mask>
<interface_name>
AnyConnect SSL VPN^ webvpn
2,3 enable <interface_name>
^1 The HTTP feature is enabled via the Firepower Threat Defense Platform
Settings > HTTP configuration page on the Firepower Management Console
(FMC).
^2 Remote Access VPN features are enabled via the Devices > VPN > Remote
Access configuration page on the FMC or via the Device > Remote Access VPN
configuration page on the Firepower Device Manager (FDM).
^3 Remote Access VPN features are first supported as of software release
6.2.1.
Determining the Cisco FTD Software Release
To determine which Cisco FTD Software release is running on a device,
administrators can log in to the device and use the show version command in
the CLI. The following example shows the output of the command for a device
that is running Cisco FTD Software Release 6.2.2:
> show version
------------------[ ftd ]-----------------------
Model : Cisco Firepower 2130 Threat Defense (77) Version 6.2.2 (Build 81)
UUID : 0cd3595a-7efa-11e7-aaa1-ee3989c8bf25
Rules update version : 2017-12-20-001-vrt
VDB version : 290
----------------------------------------------------
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
vulnerability.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license:
https://www.cisco.com/c/en/us/products/end-user-license-agreement.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades, customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories and Alerts page, to determine exposure and a
complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC:
https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Fixed Releases
Customers should upgrade to an appropriate release as indicated in the
table(s) in this section. To help ensure a complete upgrade solution,
consider that this advisory is part of a collection that includes the
following advisories:
- cisco-sa-20180418-asa1: Cisco Adaptive Security Appliance SSL
Certificate Bypass Vulnerability
- cisco-sa-20180418-asa2: Cisco Adaptive Security Appliance Flow Creation
Denial of Service Vulnerability
- cisco-sa-20180418-asa3: Cisco Adaptive Security Appliance TLS Denial of
Service Vulnerability
- cisco-sa-20180418-asaanyconnect: Cisco ASA Software, FTD Software, and
AnyConnect Secure Mobility Client SAML Authentication Session Fixation
Vulnerability
- cisco-sa-20180418-asa_inspect: Cisco Adaptive Security Appliance
Application Layer Protocol Inspection Denial of Service Vulnerability
In the following table(s), the left column lists major releases of Cisco
software. The center column indicates whether a major release is affected
by the vulnerability described in this advisory and the first minor release
that includes the fix for this vulnerability. The right column indicates
whether a major release is affected by all the vulnerabilities described in
this collection of advisories and the current recommended release for those
vulnerabilities.
ASA Software
Cisco ASA First Fixed Release Recommended Fixed Release for All the
Major for This Vulnerabilities Described in this
Release Vulnerability Collection of Advisories
Prior to Not vulnerable 9.1.7.20
9.1^1
9.1 Not vulnerable 9.1.7.20
9.2 9.2.4.27 9.2.4.27
9.3^1 Migrate to 9.4.4.13 9.4.4.14
9.4 9.4.4.13 9.4.4.14
9.5^1 Migrate to 9.6.3.20 9.6.4.6
9.6 9.6.3.20 9.6.4.6
9.7 9.7.1.16 9.7.1.24
9.8 9.8.2.14 9.8.2.28
9.9 Not vulnerable 9.9.2.1
^1 Cisco ASA Software releases prior to 9.1 and ASA releases 9.3 and 9.5
have reached End of Software Maintenance. Customers should migrate to a
supported release.
The software is available for download from Cisco Software Center by
navigating to Products > Security > Firewalls > Adaptive Security
Appliances (ASA) > ASA 5500-X Series Firewalls where there is a list of ASA
hardware platforms. The majority of these software releases are listed
under Interim.
FTD Software
Cisco First Fixed Recommended Fixed Release for All the
FTD Release for This Vulnerabilities Described in this Collection of
Major Vulnerability Advisories
Release
Cisco_FTD_SSP_Hotfix_EI-6.1.0.7-2.sh (41xx and
Migrate to 9300 FTD hardware platform)
6.0 6.1.0.6
Cisco_FTD_Hotfix_EI-6.1.0.7-2.sh (All FTD
hardware platforms except 41xx and 9300)
Cisco_FTD_SSP_Hotfix_EI-6.1.0.7-2.sh (41xx and
Migrate to 9300 FTD hardware platform)
6.0.1 6.1.0.6
Cisco_FTD_Hotfix_EI-6.1.0.7-2.sh (All FTD
hardware platforms except 41xx and 9300)
Cisco_FTD_SSP_Hotfix_EI-6.1.0.7-2.sh (41xx and
9300 FTD hardware platform)
6.1.0 6.1.0.6
Cisco_FTD_Hotfix_EI-6.1.0.7-2.sh (All FTD
hardware platforms except 41xx and 9300)
6.2.0 Not vulnerable^1 6.2.0.5
Cisco_FTD_SSP_Hotfix_BD-6.2.2.3-4.sh.REL.tar
(41xx and 9300 FTD hardware platforms)
6.2.1 Migrate to Cisco_FTD_SSP_FP2K_Hotfix_BD-6.2.2.3-4.sh.REL.tar
6.2.2.1 (21xx FTD hardware platform)
Cisco_FTD_Hotfix_BD-6.2.2.3-4.sh.REL.tar (All
other FTD hardware platforms)
Cisco_FTD_SSP_Hotfix_BD-6.2.2.3-4.sh.REL.tar
(41xx and 9300 FTD hardware platforms)
6.2.2 6.2.2.1 Cisco_FTD_SSP_FP2K_Hotfix_BD-6.2.2.3-4.sh.REL.tar
(21xx FTD hardware platform)
Cisco_FTD_Hotfix_BD-6.2.2.3-4.sh.REL.tar (All
other FTD hardware platforms)
Cisco_FTD_SSP_Hotfix_A-6.2.3.1-10.sh.REL.tar
(41xx and 9300 FTD hardware platforms)
6.2.3 Not vulnerable Cisco_FTD_SSP_FP2K_Hotfix_A-6.2.3.1-10.sh.REL.tar
(21xx FTD hardware platform)
Cisco_FTD_Hotfix_A-6.2.3.1-10.sh.REL.tar (All
other FTD hardware platforms)
^1 Cisco FTD Software release 6.2.0 introduced a new HTTP server and thus
the attack vector via the HTTP Service no longer applies.
The software is available for download from Cisco Software Center by
navigating to Products > Security > Firewalls> Next-Generation Firewalls
(NGFW) where there is a list of possible FTD hardware platforms.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o This vulnerability was found during the resolution of a Cisco TAC support
case.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy. This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
Subscribe to Cisco Security Notifications
o Subscribe
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa3
Revision History
o +---------+--------------------------+---------+--------+----------------+
| Version | Description | Section | Status | Date |
+---------+--------------------------+---------+--------+----------------+
| 1.0 | Initial public release. | - | Final | 2018-April-18 |
+---------+--------------------------+---------+--------+----------------+
Legal Disclaimer
o THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND
OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT
OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES
THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information
or contain factual errors. The information in this document is intended for
end users of Cisco products.
- --------------------------END INCLUDED TEXT--------------------
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