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AUSCERT External Security Bulletin Redistribution
ESB-2017.2496
Cisco Adaptive Security Appliance Software Multiple Vulnerability
5 October 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Adaptive Security Appliance (ASA)
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Cross-site Scripting -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2017-12265 CVE-2017-12246
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171004-asa
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171004-asa1
Comment: This bulletin contains two (2) Cisco Systems security advisories.
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Cisco Adaptive Security Appliance Software Direct Authentication Denial of
Service Vulnerability
High
Advisory ID:
cisco-sa-20171004-asa
First Published:
2017 October 4 16:00 GMT
Version 1.0:
Final
Workarounds:
No workarounds available
Cisco Bug IDs:
CSCvd59063
CVSS Score: Base 8.6
CVE-2017-12246
CWE-399
Summary
A vulnerability in the implementation of the direct authentication feature in
Cisco Adaptive Security Appliance (ASA) Software could allow an
unauthenticated, remote attacker to cause an affected device to unexpectedly
reload, resulting in a denial of service (DoS) condition.
The vulnerability is due to incomplete input validation of the HTTP header. An
attacker could exploit this vulnerability by sending a crafted HTTP request to
the local IP address of an affected device. A successful exploit could allow
the attacker to cause the affected device to reload.
Note: Only traffic directed to the affected system can be used to exploit this
vulnerability. This vulnerability affects systems that have the direct
authentication feature enabled. This vulnerability can be triggered by IPv4 or
IPv6 traffic.
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-20171004-asa
Affected Products
Vulnerable Products
This vulnerability affects Cisco Adaptive Security Appliance (ASA) Software
that is running on the following Cisco products:
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
ASA 1000V Cloud Firewall
Adaptive Security Virtual Appliance (ASAv)
Firepower 4110 Security Appliance
Firepower 9300 ASA Security Module
ISA 3000 Industrial Security Appliance
For information about which software releases are vulnerable, see the Fixed
Software section of this advisory.
This vulnerability affects devices that are running a vulnerable release of
Cisco ASA Software and have direct authentication enabled. The vulnerability
only applies to HTTP access over the web management interface, telnet access
with direct authentication is not vulnerable.
Direct Authentication
To determine whether direct authentication is enabled, administrators can use
the show running-config | include "aaa authentication listener" command in the
CLI and verify that the command returns output.
The following example shows the output of the command for a device that is
running Cisco ASA Software and has direct authentication enabled:
ciscoasa# show running-config | include "aaa authentication listener"
aaa authentication listener http inside port 5555
For additional information, refer to the configuration example in the Direct
Authentication section of the Cut-Through and Direct ASA Authentication
Configuration Example document.
Determining the Running 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 9.2(1):
ciscoasa# show version | include Version
Cisco Adaptive Security Appliance Software Version 9.2(1)
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.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
vulnerability.
Cisco has confirmed that this vulnerability does not affect the following
Cisco platforms:
Firepower 2100 Series Security Appliance
Firepower Threat Defense Software
Workarounds
There are no workarounds that address this vulnerability.
Fixed Software
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 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:
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
In the following table, the left column lists major releases of Cisco ASA
Software. The right column indicates whether a major release is affected by
the vulnerability described in this advisory and the first release that
includes the fix for this vulnerability. Customers should upgrade to an
appropriate release as indicated in this section.
Cisco ASA Major Release First Fixed Release
Prior to 9.1[1] Affected, migrate to 9.1.7.17 or later
9.1 9.1.7.17 or later
9.2 9.2.4.20 or later
9.3[1] Affected, migrate to 9.4.4.6
9.4 9.6.3 or later
9.5[1] 9.5.3.9 or later
9.6 9.6.3 or later
9.7 9.7.1.8 or later
9.8 9.8.1 or later
[1]Cisco ASA Software releases prior to 9.1 and Cisco ASA releases 9.3 and 9.5
have reached End of Software Maintenance. Customers should migrate to a
supported release.
Exploitation and Public Announcements
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
This vulnerability was found during resolution of a Cisco TAC support case.
URL
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171004-asa
Revision History
Version Description Section Status Date
1.0 Initial public release. - Final 2017-October-04
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Cisco Adaptive Security Appliance Software HREF Cross-Site Scripting
Vulnerability
Medium
Advisory ID:
cisco-sa-20171004-asa1
First Published:
2017 October 4 16:00 GMT
Version 1.0:
Final Workarounds: No workarounds available
Cisco Bug IDs:
CSCve91068
CVSS Score:
Base 6.1
CVE-2017-12265
CWE-79
Summary
A vulnerability in the web-based management interface 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 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.
Additional information about XSS attacks and potential mitigations can be
found at:
https://tools.cisco.com/security/center/content/CiscoAppliedMitigationBulletin/cisco-amb-20060922-understanding-xss
https://www.owasp.org/index.php/Cross-site_Scripting_(XSS)
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-20171004-asa1
Affected Products
Vulnerable Products
The vulnerability exists in the Cisco Adaptive Security Appliance (ASA)
Software when the WEBVPN feature is enabled. The following two commands in the
configuration file indicate that the WEBVPN feature is enabled:
webvpn
enable outside
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
There are no workarounds that address this vulnerability.
Fixed Software
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
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
This vulnerability was found during resolution of a Cisco TAC support case.
URL
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171004-asa1
Revision History
Version Description Section Status Date
1.0 Initial public release. - Final 2017-October-04
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