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AUSCERT External Security Bulletin Redistribution
ESB-2021.3595
Cisco Adaptive Security Appliance Software and Firepower Threat Defense
Software Web Services multiple vulnerabilities
28 October 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Adaptive Security Appliance Software
Firepower Threat Defense Software
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-2021-40118 CVE-2021-34704 CVE-2021-1573
CVE-2021-1444
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asafdt-webvpn-dos-KSqJAKPA
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-xss-webui-gQLSFyPM
Comment: This bulletin contains two (2) Cisco Systems security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Adaptive Security Appliance Software and Firepower Threat Defense
Software Web Services Denial of Service Vulnerabilities
Priority: High
Advisory ID: cisco-sa-asafdt-webvpn-dos-KSqJAKPA
First Published: 2021 October 27 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvy36910 CSCvy58278 CSCvy89144
CVE Names: CVE-2021-1573 CVE-2021-34704 CVE-2021-40118
CWEs: CWE-121 CWE-234 CWE-787
Summary
o Multiple vulnerabilities in the web services interface of Cisco Adaptive
Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD)
Software could allow an unauthenticated, remote attacker to trigger a
denial of service (DoS) condition.
These vulnerabilities are due to improper input validation when parsing
HTTPS requests. An attacker could exploit these vulnerabilities by sending
a malicious HTTPS request to 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 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-asafdt-webvpn-dos-KSqJAKPA
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
These vulnerabilities affect Cisco products if they are running a
vulnerable release of Cisco ASA Software or Cisco FTD Software with a
vulnerable AnyConnect or WebVPN configuration.
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
Determine the ASA Software Configuration
Use the show-running-config CLI command to determine whether the software
has a vulnerable feature configured. In the following table, the left
column lists the Cisco ASA Software features that are vulnerable. The right
column indicates the basic configuration for each feature from the show
running-config CLI command. If a device is running a vulnerable release and
has one of these features configured, it is vulnerable.
Cisco ASA Feature Vulnerable Configuration
AnyConnect Internet Key Exchange crypto ikev2 enable client-services port
Version 2 Remote Access (with
client services)
webvpn
AnyConnect SSL VPN enable
Clientless SSL VPN webvpn
enable
Determine the FTD Software Configuration
Use the show-running-config CLI command to determine whether the software
has a vulnerable feature configured. In the following table, the left
column lists the Cisco FTD Software features that are vulnerable. The right
column indicates the basic configuration for each feature from the show
running-config CLI command. If a device is running a vulnerable release and
has one of these features configured, it is vulnerable.
Cisco FTD Feature Vulnerable Configuration
AnyConnect Internet Key Exchange crypto ikev2 enable client-services port
Version 2 Remote Access (with
client services) ^1,2
AnyConnect SSL VPN ^1,2 webvpn
enable
1. Remote Access VPN features were introduced in Cisco FTD Software Release
6.2.2.
2. Remote Access VPN features are enabled by using Devices > VPN > Remote
Access in Cisco Firepower Management Center (FMC) or by using Device >
Remote Access VPN in Cisco Firepower Device Manager (FDM).
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by these vulnerabilities.
Cisco has confirmed that these vulnerabilities do not affect Cisco
Firepower Management Center (FMC) Software.
Workarounds
o There are no workarounds that address these vulnerabilities.
Fixed Software
o Cisco has released free software updates that address the vulnerabilities
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 columns indicate whether a release is affected by the
vulnerabilities described in this advisory and the first release that
includes the fix for these vulnerabilities. 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 First Fixed First Fixed First Fixed First Fixed Release for
ASA Release for Release for Release for All Vulnerabilities
Major CVE-2021-1573 CVE-2021-34704 CVE-2021-40118 Described in the Bundle
Release of Advisories
9.7 and Migrate to a Not Migrate to a Migrate to a fixed
earlier fixed vulnerable. fixed release. release.
^1 release.
9.8 9.8.4.40 Not 9.8.4.40 9.8.4.40
vulnerable.
Migrate to a Not Migrate to a Migrate to a fixed
9.9 ^1 fixed vulnerable. fixed release. release.
release.
Migrate to a Not Migrate to a Migrate to a fixed
9.10 ^1 fixed vulnerable. fixed release. release.
release.
9.12 9.12.4.26 Not 9.12.4.29 9.12.4.29
vulnerable.
Migrate to a Not Migrate to a Migrate to a fixed
9.13 ^1 fixed vulnerable. fixed release. release.
release.
9.14 9.14.3 Not 9.14.3.9 9.14.3.9
vulnerable.
9.15 9.15.1.17 9.15.1.17 9.15.1.17 9.15.1.17
9.16 9.16.1.28 9.16.2 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 these
vulnerabilities.
FTD Software
Cisco First Fixed First Fixed First Fixed First Fixed Release for
FTD Release for Release for Release for All Vulnerabilities
Major CVE-2021-1573 CVE-2021-34704 CVE-2021-40118 Described in the Bundle
Release of Advisories
6.2.2 Migrate to a
and fixed Not Migrate to a Migrate to a fixed
earlier release. vulnerable. fixed release. release.
^1
Migrate to a Not Migrate to a Migrate to a fixed
6.2.3 fixed vulnerable. fixed release. release.
release.
6.3.0 ^ Migrate to a Not Migrate to a Migrate to a fixed
1 fixed vulnerable. fixed release. release.
release.
6.4.0 6.4.0.13 (Nov Not 6.4.0.13 (Nov 6.4.0.13 (Nov 2021)
2021) vulnerable. 2021)
6.5.0 ^ Migrate to a Not Migrate to a Migrate to a fixed
1 fixed vulnerable. fixed release. release.
release.
6.6.0 6.6.5 Not 6.6.5 6.6.5.1 (Nov 2021)
vulnerable.
6.7.0 6.7.0.3 (Jan 6.7.0.3 (Jan 6.7.0.3 (Jan 6.7.0.3 (Jan 2022)
2022) 2022) 2022)
7.0.0 7.0.1 7.0.1 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 these vulnerabilities.
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 vulnerabilities that are described in this advisory.
Source
o CVE-2021-1573 was found during internal security testing.
Cisco would like to thank Nikita Abramov of Positive Technologies for
reporting CVE-2021-34704.
Cisco would like to thank Ruslan Sayfiev, Denis Faiustov, and Masahiro
Kawada of Ierae Security for reporting CVE-2021-40118.
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-asafdt-webvpn-dos-KSqJAKPA
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 Web Services Interface Cross-Site Scripting Vulnerability
Priority: Medium
Advisory ID: cisco-sa-asaftd-xss-webui-gQLSFyPM
First Published: 2021 October 27 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvy20504
CVE Names: CVE-2021-1444
CWEs: CWE-79
Summary
o A vulnerability in the web services interface of Cisco Adaptive Security
Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software
could allow an unauthenticated, remote attacker to conduct cross-site
scripting (XSS) attacks against a user of the interface.
This vulnerability is due to insufficient validation of user-supplied input
by the web services 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.
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-xss-webui-gQLSFyPM
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 had a vulnerable AnyConnect or WebVPN configuration.
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 Device Configuration
Determine the Vulnerable ASA Software Configuration
To determine if a device is configured for AnyConnect IKEv2 Remote Access,
AnyConnect SSL VPN access, 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 Software Feature Vulnerable Configuration
AnyConnect Internet Key Exchange crypto ikev2 enable client-services port
Version 2 (IKEv2) Remote Access
(with client services)
webvpn
AnyConnect SSL VPN enable
Clientless SSL VPN webvpn
enable
Determine the Vulnerable FTD Software Configuration
To determine if a device is configured for AnyConnect IKEv2 Remote Access
or AnyConnect SSL VPN access, 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 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 FTD Software Feature Vulnerable Configuration
AnyConnect Internet Key Exchange crypto ikev2 enable client-services port
Version 2 (IKEv2) Remote Access
(with client services) ^1,2
AnyConnect SSL VPN ^1,2 webvpn
enable
1. Remote Access VPN features are first supported in Cisco FTD Software
Release 6.2.2.
2. Remote Access VPN features are enabled by using Devices > VPN > Remote
Access in Cisco Firepower Management Center (FMC) or by using Device >
Remote Access VPN in Cisco Firepower Device Manager (FDM).
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 these vulnerabilities do 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 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 9.12.4.26
9.13 ^1 Migrate to a fixed release.
9.14 9.14.3
9.15 9.15.1.17 (Target 10/13/2021)
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
6.2.2 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.
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 Cisco would like to thank Maxim Suslov for reporting this vulnerability.
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
Cross-Site Scripting
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-xss-webui-gQLSFyPM
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-OCT-27 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------END INCLUDED TEXT--------------------
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