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AUSCERT External Security Bulletin Redistribution
ESB-2022.1921
Cisco Firepower Threat Defense Software TCP Proxy Denial of
Service Vulnerability
29 April 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Firepower Threat Defense Software
Publisher: Cisco Systems
Operating System: Cisco
Resolution: Patch/Upgrade
CVE Names: CVE-2022-20746
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-tcp-dos-kM9SHhOu
Comment: CVSS (Max): 8.6 CVE-2022-20746 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)
CVSS Source: Cisco Systems
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
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Cisco Firepower Threat Defense Software TCP Proxy Denial of Service
Vulnerability
Priority: High
Advisory ID: cisco-sa-ftd-tcp-dos-kM9SHhOu
First Published: 2022 April 27 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvz00032
CVE Names: CVE-2022-20746
CWEs: CWE-476
Summary
o A vulnerability in the TCP proxy functionality of Cisco Firepower Threat
Defense (FTD) Software could allow an unauthenticated, remote attacker to
trigger a denial of service (DoS) condition.
This vulnerability is due to improper handling of TCP flows. An attacker
could exploit this vulnerability by sending a crafted stream of TCP traffic
through 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-asaftd-tcp-dos-kM9SHhOu
This advisory is part of the April 2022 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: April 2022 Cisco
ASA, FMC, and FTD Software Security Advisory Bundled Publication .
Affected Products
o Vulnerable Products
This vulnerability affects Cisco products if they are running Cisco FTD
Software Release 7.0.0 or Release 7.0.0.1 and have the TCP Intercept
feature enabled.
Determine the TCP Intercept Configuration
To determine the status of the TCP Intercept feature, use the show
running-config policy-map | include embryonic command on the device CLI. If
the command returns output, TCP Intercept is enabled and the device is
affected by this vulnerability. If the command does not return output, TCP
Intercept is disabled and the device is not affected by this vulnerability.
The following example shows the output of a device on which TCP Intercept
is enabled with both a global limit and a per-client limit of one for
half-open (embryonic) TCP connections:
ftd# show running-config policy-map | include embryonic
set connection embryonic-conn-max 1 per-client-embryonic-max 1
Having either a global ( embryonic-conn-max) or a per client (
per-client-embryonic-max ) limit configured is sufficient to enable the TCP
Intercept feature. The exact value of these limits does not affect the
vulnerability status of the device.
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 Adaptive
Security Appliance (ASA) Software or Cisco Firepower Management Center
(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 with service contracts that entitle
them to regular software updates should obtain security fixes through their
usual update channels.
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.
The Cisco Support and Downloads page on Cisco.com provides information
about licensing and downloads. This page can also display customer device
support coverage for customers who use the My Devices tool.
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.
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 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. 6.4.0.15 (May 2022)
6.5.0 ^1 Not vulnerable. Migrate to a fixed release.
6.6.0 Not vulnerable. 6.6.5.2
6.7.0 Not vulnerable. Migrate to a fixed release.
7.0.0 7.0.1 7.0.2 (May 2022)
7.1.0 Not vulnerable. 7.1.0.1
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: April 2022 Cisco ASA, FMC, and FTD Software Security
Advisory Bundled Publication
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-tcp-dos-kM9SHhOu
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2022-APR-27 |
+----------+---------------------------+----------+--------+--------------+
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