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AUSCERT External Security Bulletin Redistribution
ESB-2022.5772
Cisco Firepower Threat Defense Software and Cisco FXOS
Software Command Injection Vulnerability
10 November 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Firepower Threat Defense Software
Cisco FXOS Software
Publisher: Cisco Systems
Operating System: Cisco
Resolution: Patch/Upgrade
CVE Names: CVE-2022-20934
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-fxos-cmd-inj-Q9bLNsrK
Comment: CVSS (Max): 6.0 CVE-2022-20934 (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N)
CVSS Source: Cisco Systems
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
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Cisco Firepower Threat Defense Software and Cisco FXOS Software Command
Injection Vulnerability
Priority: Medium
Advisory ID: cisco-sa-ftd-fxos-cmd-inj-Q9bLNsrK
First Published: 2022 November 9 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCwb41854 CSCwc02133
CVE Names: CVE-2022-20934
CWEs: CWE-77
Summary
o A vulnerability in the CLI of Cisco Firepower Threat Defense (FTD) Software
and Cisco FXOS Software could allow an authenticated, local attacker to
execute arbitrary commands on the underlying operating system as root .
This vulnerability is due to improper input validation for specific CLI
commands. An attacker could exploit this vulnerability by injecting
operating system commands into a legitimate command. A successful exploit
could allow the attacker to escape the restricted command prompt and
execute arbitrary commands on the underlying operating system. To
successfully exploit this vulnerability, an attacker would need valid
Administrator credentials.
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-ftd-fxos-cmd-inj-Q9bLNsrK
This advisory is part of the November 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: November 2022
Semiannual 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 FTD Software.
At the time of publication, this vulnerability also affected the following
products if they were running a vulnerable release of Cisco FXOS Software:
Firepower 4100 Series
Firepower 9300 Series
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
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 the following
Cisco products:
Adaptive Security Appliance (ASA) Software
Firepower 1000 Series
Firepower 2100 Series
Firepower Management Center (FMC) Software
Details
o For Cisco products that are listed as vulnerable in this security advisory,
Administrator accounts have access by default to the underlying operating
system through expert mode. In the most common scenario, an attacker would
not gain any benefit by exploiting this vulnerability because all the
command execution capabilities would be available to them through
legitimate means. However, for deployments in which administrators are
prevented from accessing the expert mode (for example, multi-Instance
deployments or systems configured with the system lockdown-sensor command),
this vulnerability can be exploited to regain access to the expert mode
command prompt, which should no longer be available.
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.
Cisco ASA, FMC, FTD, and FXOS Software
To help customers determine their exposure to vulnerabilities in Cisco ASA,
FMC, FTD, and FXOS Software, Cisco provides the Cisco Software Checker .
This tool identifies any Cisco security advisories that impact a specific
software release and the earliest release that fixes the vulnerabilities
that are described in each advisory ("First Fixed"). If applicable, the
tool also returns the earliest release that fixes all the vulnerabilities
that are described in all the advisories that the Software Checker
identifies ("Combined First Fixed").
To use the tool, go to the Cisco Software Checker page and follow the
instructions. Alternatively, use the following form to search for
vulnerabilities that affect a specific software release. To use the form,
follow these steps:
1. Choose which advisories the tool will search-all advisories, only
advisories with a Critical or High Security Impact Rating (SIR) , or
only this advisory.
2. Choose the appropriate software.
3. Choose the appropriate platform.
4. Enter a release number-for example, 2.9.1.158 for Cisco Firepower 4100
Series Security Appliances or 9.16.2.11 for Cisco ASA Software.
5. Click Check .
For instructions on upgrading your FTD device, see Cisco Firepower
Management Center Upgrade Guide .
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 by Brandon Sakai 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: November 2022 Semiannual Cisco ASA, FMC, and FTD
Software Security Advisory Bundled Publication
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-fxos-cmd-inj-Q9bLNsrK
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2022-NOV-09 |
+----------+---------------------------+----------+--------+--------------+
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