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AUSCERT External Security Bulletin Redistribution
ESB-2021.3599
Cisco Adaptive Security Appliance Software and Firepower
Threat Defense Software Vulnerabilities
28 October 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Adaptive Security Appliance (ASA)
Cisco Firepower Threat Defense (FTD)
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-40125 CVE-2021-40117 CVE-2021-34794
CVE-2021-34792 CVE-2021-34787
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-snmpaccess-M6yOweq3
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-rule-bypass-ejjOgQEY
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ikev2-dos-g4cmrr7C
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-dos-4ygzLKU9
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-dos-Unk689XY
Comment: This bulletin contains five (5) Cisco Systems security advisories.
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Cisco Adaptive Security Appliance Software and Firepower Threat Defense
Software SNMP Access Control Vulnerability
Priority: Medium
Advisory ID: cisco-sa-asaftd-snmpaccess-M6yOweq3
First Published: 2021 October 27 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvv49739 CSCvw31710 CSCvw51436
CVE Names: CVE-2021-34794
CWEs: CWE-284
Summary
o A vulnerability in the Simple Network Management Protocol version 3
(SNMPv3) access control functionality of Cisco Adaptive Security Appliance
(ASA) Software and Cisco Firepower Threat Defense (FTD) Software could
allow an unauthenticated, remote attacker to query SNMP data.
This vulnerability is due to ineffective access control. An attacker could
exploit this vulnerability by sending an SNMPv3 query to an affected device
from a host that is not permitted by the SNMPv3 access control list. A
successful exploit could allow the attacker to send an SNMP query to an
affected device and retrieve information from the device. The attacker
would need valid credentials to perform the SNMP query.
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-asaftd-snmpaccess-M6yOweq3
This advisory is part of the October 2021 release of the Cisco ASA, FTD,
and FMC Security Advisory Bundled publication. For a complete list of the
advisories and links to them, see Cisco Event Response: October 2021 Cisco
ASA, FMC, and FTD Software Security Advisory Bundled Publication .
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected Cisco Adaptive
Security Appliances and Cisco Firepower Appliances if they were running a
vulnerable release of Cisco ASA Software or FTD Software and had SNMPv3
access control configured.
For information about which Cisco software releases were vulnerable at the
time of publication, see the Fixed Software section of this advisory. See
the Details section in the bug ID(s) at the top of this advisory for the
most complete and current information.
Determine the Device Configuration
To determine whether an SNMPv3 user-based access control entry is
configured, run the show running-config snmp-server CLI command and check
for the presence of version 3 in the output. The following output shows a
configured SNMPv3 access entry:
ASA# show running-config snmp-server | include host
snmp-server host internalMgmt 10.10.10.10 version 3 snmpUser
snmp-server host internalMgmt 10.11.12.13 community snmpCommunity
ASA#
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect Cisco Firepower
Management Center (FMC) Software.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories 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.
Fixed Releases
At the time of publication, the release information in the following table
(s) was accurate. See the Details section in the bug ID(s) at the top of
this advisory for the most complete and current information.
The left column lists Cisco software releases, and the right column
indicates whether a release was affected by the vulnerability described in
this advisory and which release included the fix for this vulnerability.
ASA Software
Cisco ASA Software Release First Fixed Release for This Vulnerability
Earlier than 9.8 ^1 Not vulnerable.
9.8 Not vulnerable.
9.9 ^1 Not vulnerable.
9.10 ^1 Not vulnerable.
9.12 Not vulnerable.
9.13 ^1 Not vulnerable.
9.14 9.14.2.4
9.15 9.15.1.7
9.16 Not vulnerable.
1. Cisco ASA Software releases 9.7 and earlier as well as releases 9.9,
9.10, and 9.13 have reached end of software maintenance . Customers are
advised to migrate to a supported release that includes the fix for this
vulnerability.
FTD Software
Cisco FTD Software Release First Fixed Release for This Vulnerability
6.2.2 and earlier ^1 Not vulnerable.
6.2.3 Not vulnerable.
6.3.0 ^1 Not vulnerable.
6.4.0 6.4.0.13 (Nov 2021)
6.5.0 ^1 Migrate to a fixed release.
6.6.0 6.6.5
6.7.0 6.7.0.1
7.0.0 Not vulnerable.
1. Cisco FMC and FTD Software releases 6.2.2 and earlier, as well as
releases 6.3.0 and 6.5.0, have reached end of software maintenance .
Customers are advised to migrate to a supported release that includes the
fix for this vulnerability.
For instructions on upgrading your FTD device, see Cisco Firepower
Management Center Upgrade Guide .
The Cisco Product Security Incident Response Team (PSIRT) validates only
the affected and fixed release information that is documented in this
advisory.
Exploitation and Public Announcements
o The Cisco 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 internal security testing.
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.
Related to This Advisory
o Cisco Event Response: October 2021 Cisco ASA, FMC, and FTD Software
Security Advisory Bundled Publication
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-snmpaccess-M6yOweq3
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-OCT-27 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------------------------------------------------------------------------------------------
Cisco Adaptive Security Appliance Software and Firepower Threat Defense
Software Identity-Based Rule Bypass Vulnerability
Priority: Medium
Advisory ID: cisco-sa-asaftd-rule-bypass-ejjOgQEY
First Published: 2021 October 27 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvx47895
CVE Names: CVE-2021-34787
CWEs: CWE-183
Summary
o A vulnerability in the identity-based firewall (IDFW) rule processing
feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco
Firepower Threat Defense (FTD) Software could allow an unauthenticated,
remote attacker to bypass security protections.
This vulnerability is due to improper handling of network requests by
affected devices configured to use object group search. An attacker could
exploit this vulnerability by sending a specially crafted network request
to an affected device. A successful exploit could allow the attacker to
bypass access control list (ACL) rules on the device, bypass security
protections, and send network traffic to unauthorized hosts.
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-asaftd-rule-bypass-ejjOgQEY
This advisory is part of the October 2021 release of the Cisco ASA, FTD,
and FMC Security Advisory Bundled publication. For a complete list of the
advisories and links to them, see Cisco Event Response: October 2021 Cisco
ASA, FMC, and FTD Software Security Advisory Bundled Publication .
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected Cisco products if
they were running a vulnerable release of Cisco ASA Software or FTD
Software and had IDFW rules using object group search properties.
For information about which Cisco software releases were vulnerable at the
time of publication, see the Fixed Software section of this advisory. See
the Details section in the bug ID(s) at the top of this advisory for the
most complete and current information.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect Cisco Firepower
Management Center (FMC) Software.
Details
o Exploitation of this vulnerability could allow an attacker to bypass
protections that are provided by an ACL that is applied on an affected
device. The overall impact of exploitation is organization-specific because
it depends on the importance of the assets that the ACL was supposed to
protect. Customers should evaluate how exploitation of this vulnerability
would impact their network and proceed according to their own
vulnerability-handling and remediation processes.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories 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.
Fixed Releases
At the time of publication, the release information in the following table
(s) was accurate. See the Details section in the bug ID(s) at the top of
this advisory for the most complete and current information.
The left column lists Cisco software releases, and the right column
indicates whether a release was affected by the vulnerability described in
this advisory and which release included the fix for this vulnerability.
ASA Software
Cisco ASA Software Release First Fixed Release for This Vulnerability
9.7 and earlier ^1 Migrate to a fixed release.
9.8 9.8.4.40
9.9 ^1 Migrate to a fixed release.
9.10 ^1 Migrate to a fixed release.
9.12 9.12.4.25
9.13 ^1 Migrate to a fixed release.
9.14 9.14.3.1
9.15 9.15.1.17
9.16 9.16.1.28
1. Cisco ASA Software releases 9.7 and earlier as well as releases 9.9,
9.10, and 9.13 have reached end of software maintenance . Customers are
advised to migrate to a supported release that includes the fix for this
vulnerability.
FTD Software
Cisco FTD Software Release First Fixed Release for This Vulnerability
6.3 and earlier ^1 Migrate to a fixed release.
6.4 6.4.0.13 (Nov 2021)
6.5 ^1 Migrate to a fixed release.
6.6 6.6.5
6.7 6.7.0.3 (Jan 2022)
7.0 7.0.1
1. Cisco FMC and FTD Software releases 6.2.2 and earlier, as well as
releases 6.3.0 and 6.5.0, have reached end of software maintenance .
Customers are advised to migrate to a supported release that includes the
fix for this vulnerability.
For instructions on upgrading your FTD device, see Cisco Firepower
Management Center Upgrade Guide .
The Cisco Product Security Incident Response Team (PSIRT) validates only
the affected and fixed release information that is documented in this
advisory.
Exploitation and Public Announcements
o The Cisco 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.
Related to This Advisory
o Cisco Event Response: October 2021 Cisco ASA, FMC, and FTD Software
Security Advisory Bundled Publication
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-rule-bypass-ejjOgQEY
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-OCT-27 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------------------------------------------------------------------------------------------
Cisco Adaptive Security Appliance Software and Firepower Threat Defense
Software IKEv2 Site-to-Site VPN Denial of Service Vulnerability
Priority: Medium
Advisory ID: cisco-sa-asaftd-ikev2-dos-g4cmrr7C
First Published: 2021 October 27 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvy93480
CVE Names: CVE-2021-40125
CWEs: CWE-416
Summary
o A vulnerability in the Internet Key Exchange Version 2 (IKEv2)
implementation of Cisco Adaptive Security Appliance (ASA) Software and
Cisco Firepower Threat Defense (FTD) Software could allow an authenticated,
remote attacker to trigger a denial of service (DoS) condition on an
affected device.
This vulnerability is due to improper control of a resource. An attacker
with the ability to spoof a trusted IKEv2 site-to-site VPN peer and in
possession of valid IKEv2 credentials for that peer could exploit this
vulnerability by sending malformed, authenticated IKEv2 messages to an
affected device. A successful exploit could allow the attacker to trigger a
reload of the 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-asaftd-ikev2-dos-g4cmrr7C
This advisory is part of the October 2021 release of the Cisco ASA, FTD,
and FMC Security Advisory Bundled publication. For a complete list of the
advisories and links to them, see Cisco Event Response: October 2021 Cisco
ASA, FMC, and FTD Software Security Advisory Bundled Publication .
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected Cisco products if
they were running a vulnerable release of Cisco ASA Software or Cisco FTD
Software and were configured with at least one IKEv2 site-to-site VPN peer.
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory. See the Details section in the bug
ID(s) at the top of this advisory for the most complete and current
information.
Determine the IKEv2 Site-to-Site VPN Configuration
To determine whether an IKEv2 site-to-site VPN peer is configured and
enabled on the device, use the show running-config crypto CLI command and
look for the presence of all of the following:
IKEv2 enabled on an interface
A crypto map specifying an IKEv2 proposal
The same crypto map in the same sequence number identifying a peer for
the IPsec connection
The same crypto map enabled on an interface on which IKEv2 is enabled
The following example shows the output of the show running-config crypto
command on a device that has IKEv2 enabled on the outside interface on
which crypto map abcmap in sequence number 1 specifies IKEv2 proposal
secure and IPsec peer 10.10.4.108 and on which crypto map abcmap is bound
to the outside interface:
firewall# show running-config crypto
.
.
.
crypto ikev2 enable outside
.
.
.
crypto map abcmap 1 set peer 10.10.4.108
crypto map abcmap 1 set ikev2 ipsec-proposal secure
crypto map abcmap interface outside
.
.
.
firewall#
In this example, the device is vulnerable to authenticated IKEv2 messages
with an IPv4 source address of 10.10.4.108 destined to the outside
interface.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect Cisco Firepower
Management Center (FMC) Software.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories 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.
Fixed Releases
At the time of publication, the release information in the following table
(s) was accurate. See the Details section in the bug ID(s) at the top of
this advisory for the most complete and current information.
The left column lists Cisco software releases, and the right column
indicates whether a release was affected by the vulnerability described in
this advisory and which release included the fix for this vulnerability.
Cisco ASA Software
Cisco has released the following software updates to address this
vulnerability. Customers who require software updates for platforms or
releases that are not listed are advised to contact their support
organization.
ASA Software Release First Fixed Release for This Vulnerability
9.7 and earlier ^1 Not vulnerable.
9.8 9.8.4.40
9.9 ^1 Migrate to a fixed release.
9.10 ^1 Migrate to a fixed release.
9.12 9.12.4.30
9.13 ^1 Migrate to a fixed release.
9.14 9.14.3.9
9.15 9.15.1.17
9.16 9.16.2
1. Cisco ASA Software releases 9.7 and earlier as well as releases 9.9,
9.10, and 9.13 have reached end of software maintenance . Customers are
advised to migrate to a supported release that includes the fix for this
vulnerability.
Cisco FTD Software
FTD Software Release First Fixed Release for This Vulnerability
6.2.2 and earlier ^1 Migrate to a fixed release.
6.2.3 Migrate to a fixed release.
6.3.0 ^1 Migrate to a fixed release.
6.4.0 6.4.0.13 (Nov 2021)
6.5.0 ^1 Migrate to a fixed release.
6.6.0 6.6.5
6.7.0 6.7.0.3 (Jan 2022)
7.0.0 7.0.1
1. Cisco FMC and FTD Software releases 6.2.2 and earlier, as well as
releases 6.3.0 and 6.5.0, have reached end of software maintenance .
Customers are advised to migrate to a supported release that includes the
fix for this vulnerability.
For instructions on upgrading your FTD device, see Cisco Firepower
Management Center Upgrade Guide .
The Cisco Product Security Incident Response Team (PSIRT) validates only
the affected and fixed release information that is documented in this
advisory.
Exploitation and Public Announcements
o The Cisco 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 internal security testing.
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.
Related to This Advisory
o Cisco Event Response: October 2021 Cisco ASA, FMC, and FTD Software
Security Advisory Bundled Publication
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ikev2-dos-g4cmrr7C
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-OCT-27 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------------------------------------------------------------------------------------------
Cisco Adaptive Security Appliance Software and Firepower Threat Defense
Software SSL/TLS Denial of Service Vulnerability
Priority: High
Advisory ID: cisco-sa-asaftd-dos-4ygzLKU9
First Published: 2021 October 27 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvy43187
CVE Names: CVE-2021-40117
CWEs: CWE-119
Summary
o A vulnerability in SSL/TLS message handler for Cisco Adaptive Security
Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software
could allow an unauthenticated, remote attacker to cause a denial of
service (DoS) condition on an affected device.
This vulnerability exists because incoming SSL/TLS packets are not properly
processed. An attacker could exploit this vulnerability by sending a
crafted SSL/TLS packet to an affected device. A successful exploit could
allow the attacker to cause the affected device to reload, resulting in a
DoS condition.
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-asaftd-dos-4ygzLKU9
This advisory is part of the October 2021 release of the Cisco ASA, FTD,
and FMC Security Advisory Bundled publication. For a complete list of the
advisories and links to them, see Cisco Event Response: October 2021 Cisco
ASA, FMC, and FTD Software Security Advisory Bundled Publication .
Affected Products
o Vulnerable Products
This vulnerability affects Cisco products if they are running a vulnerable
release of Cisco ASA Software or Cisco FTD Software and have a vulnerable
AnyConnect or WebVPN configured.
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
Determine the ASA Software Configuration
To determine if a device is configured for AnyConnect IKEv2 Remote Access,
AnyConnect SSL VPN, or Clientless SSL VPN, use the show running-config CLI
command. In the following table, the left column lists the Cisco ASA
features that are vulnerable. The right column indicates the vulnerable
configuration for the feature from the show running-config CLI command. If
the device is configured for one of these features, it is considered
vulnerable.
Cisco ASA Feature Vulnerable Configuration
AnyConnect IKEv2 Remote Access crypto ikev2 enable client-services port
(with client services)
webvpn
AnyConnect SSL VPN enable
Clientless SSL VPN webvpn
enable
Determine the FTD Software Configuration
To determine if a device is configured for AnyConnect IKEv2 Remote Access
or AnyConnect SSL VPN, use the show running-config CLI command. In the
following table, the left column lists the Cisco FTD features that are
vulnerable. The right column indicates the basic configuration for the
feature from the show running-config CLI command. If the device is
configured for one of these features, it is considered vulnerable.
On devices running Cisco FTD Software, the show running-config command is
available from Diagnostic CLI mode only. To enter Diagnostic CLI mode, use
the system support diagnostic-cli command in the regular Cisco Firepower
Threat Defense CLI.
Cisco FTD Feature Vulnerable Configuration
AnyConnect IKEv2 Remote Access crypto ikev2 enable client-services port
(with client services) ^1,2
AnyConnect SSL VPN ^1,2 webvpn
enable
1. Remote Access VPN features are enabled through Devices > VPN > Remote
Access in the Cisco Firepower Management Center (FMC) or through Device >
Remote Access VPN in Cisco Firepower Device Manager (FDM).
2. Remote Access VPN features were first supported in Cisco FTD Software
Release 6.2.2.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect Cisco Firepower
Management (FMC) Software.
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 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
In the following table(s), the left column lists Cisco software releases.
The center column indicates whether a release is affected by the
vulnerability described in this advisory and the first release that
includes the fix for this vulnerability. The right column indicates whether
a release is affected by any of the Critical or High SIR vulnerabilities
described in this bundle and which release includes fixes for those
vulnerabilities.
ASA Software
Cisco ASA First Fixed Release First Fixed Release for All
Software for This Vulnerabilities Described in the Bundle
Release Vulnerability of Advisories
9.7 and Migrate to a fixed Migrate to a fixed release.
earlier ^1 release.
9.8 9.8.4.40 9.8.4.40
9.9 ^1 Migrate to a fixed Migrate to a fixed release.
release.
9.10 ^1 Migrate to a fixed Migrate to a fixed release.
release.
9.12 9.12.4.26 9.12.4.29
9.13 ^1 Migrate to a fixed Migrate to a fixed release.
release.
9.14 9.14.3.9 9.14.3.9
9.15 9.15.1.17 9.15.1.17
9.16 Not vulnerable. 9.16.2.3
1. Cisco ASA Software releases 9.7 and earlier as well as releases 9.9,
9.10, and 9.13 have reached end of software maintenance . Customers are
advised to migrate to a supported release that includes the fix for this
vulnerability.
FTD Software
Cisco FTD First Fixed Release First Fixed Release for All
Software for This Vulnerabilities Described in the Bundle
Release Vulnerability of Advisories
6.2.2 and Migrate to a fixed Migrate to a fixed release.
earlier ^1 release.
6.2.3 6.2.3.17 Migrate to a fixed release.
6.3.0 ^1 Migrate to a fixed Migrate to a fixed release.
release.
6.4.0 6.4.0.13 (Nov 2021) 6.4.0.13 (Nov 2021)
6.5.0 ^1 Migrate to a fixed Migrate to a fixed release.
release.
6.6.0 6.6.5 6.6.5.1 (Nov 2021)
6.7.0 6.7.0.3 (Jan 2022) 6.7.0.3 (Jan 2022)
7.0.0 Not vulnerable. 7.0.1
1. Cisco FMC and FTD Software releases 6.2.2 and earlier, as well as
releases 6.3.0 and 6.5.0, have reached end of software maintenance .
Customers are advised to migrate to a supported release that includes the
fix for this vulnerability.
For instructions on upgrading your FTD device, see Cisco Firepower
Management Center Upgrade Guide .
The Cisco Product Security Incident Response Team (PSIRT) validates only
the affected and fixed release information that is documented in this
advisory.
Exploitation and Public Announcements
o The Cisco 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 by Sanmith Prakash of Cisco during internal
security testing.
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.
Related to This Advisory
o Cisco Event Response: October 2021 Cisco ASA, FMC, and FTD Software
Security Advisory Bundled Publication
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-dos-4ygzLKU9
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-OCT-27 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------------------------------------------------------------------------------------------
Cisco Adaptive Security Appliance Software and Firepower Threat Defense
Software Resource Exhaustion Denial of Service Vulnerability
Priority: High
Advisory ID: cisco-sa-asa-ftd-dos-Unk689XY
First Published: 2021 October 27 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvx79526
CVE Names: CVE-2021-34792
CWEs: CWE-400
Summary
o A vulnerability in the memory management of Cisco Adaptive Security
Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could
allow an unauthenticated, remote attacker to cause a denial of service
(DoS) condition on an affected device.
This vulnerability is due to improper resource management when connection
rates are high. An attacker could exploit this vulnerability by opening a
significant number of connections on an affected device. A successful
exploit could allow the attacker to cause the device to reload, resulting
in a DoS condition.
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-asa-ftd-dos-Unk689XY
This advisory is part of the October 2021 release of the Cisco ASA, FTD,
and FMC Security Advisory Bundled publication. For a complete list of the
advisories and links to them, see Cisco Event Response: October 2021 Cisco
ASA, FMC, and FTD Software Security Advisory Bundled Publication .
Affected Products
o Vulnerable Products
This vulnerability affects Cisco ASA Software releases 9.14.1 until the
first fixed release and Cisco FTD Software releases 6.6.0 until the first
fixed release.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect Cisco Firepower
Management Center (FMC) Software.
Indicators of Compromise
o Exploitation of this vulnerability can cause a memory leak. If there is a
memory leak, the device could stop passing traffic or performance could
degrade.
To get alerts about sustained high memory usage, administrators can set up
syslog monitoring of Error Message 321006. For details on setting up and
logging system messages, see the Cisco ASA Series General Operations CLI
Configuration Guide .
Contact the Cisco Technical Assistance Center (TAC) if additional
assistance is required to determine whether a device has been compromised
by exploitation of 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 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
In the following table(s), the left column lists Cisco software releases.
The center column indicates whether a release is affected by the
vulnerability described in this advisory and the first release that
includes the fix for this vulnerability. The right column indicates whether
a release is affected by any of the Critical or High SIR vulnerabilities
described in this bundle and which release includes fixes for those
vulnerabilities.
ASA Software
Cisco ASA First Fixed Release First Fixed Release for All
Software for This Vulnerabilities Described in the Bundle
Release Vulnerability of Advisories
9.7 and Not vulnerable. Migrate to a fixed release.
earlier ^1
9.8 Not vulnerable. 9.8.4.40
9.9 ^1 Not vulnerable. Migrate to a fixed release.
9.10 ^1 Not vulnerable. Migrate to a fixed release.
9.12 Not vulnerable. 9.12.4.29
9.13 ^1 Not vulnerable. Migrate to a fixed release.
9.14 9.14.3.9 9.14.3.9
9.15 9.15.1.17 9.15.1.17
9.16 9.16.2.3 9.16.2.3
1. Cisco ASA Software releases 9.7 and earlier as well as releases 9.9,
9.10, and 9.13 have reached end of software maintenance . Customers are
advised to migrate to a supported release that includes the fix for this
vulnerability.
FTD Software
Cisco FTD First Fixed Release First Release for All Vulnerabilities
Software for This Vulnerability Described in the Bundle of Advisories
Release
6.2.2 and Not vulnerable. Migrate to a fixed release.
earlier ^1
6.2.3 Not vulnerable. Migrate to a fixed release.
6.3.0 ^1 Not vulnerable. Migrate to a fixed release.
6.4.0 Not vulnerable. 6.4.0.13 (Nov 2021)
6.5.0 ^1 Not vulnerable. Migrate to a fixed release.
6.6.0 6.6.5 6.6.5.1 (Nov 2021)
6.7.0 6.7.0.3 (Jan 2022) 6.7.0.3 (Jan 2022)
7.0.0 7.0.1 7.0.1
1. Cisco FMC and FTD Software releases 6.2.2 and earlier, as well as
releases 6.3.0 and 6.5.0, have reached end of software maintenance .
Customers are advised to migrate to a supported release that includes the
fix for this vulnerability.
For instructions on upgrading your FTD device, see Cisco Firepower
Management Center Upgrade Guide .
The Cisco Product Security Incident Response Team (PSIRT) validates only
the affected and fixed release information that is documented in this
advisory.
Exploitation and Public Announcements
o The Cisco 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.
Related to This Advisory
o Cisco Event Response: October 2021 Cisco ASA, FMC, and FTD Software
Security Advisory Bundled Publication
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-dos-Unk689XY
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-OCT-27 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------END INCLUDED TEXT--------------------
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