CVE-2022-20934: 
Cisco Firepower Threat Defense (FTD) vulnerability analysis and mitigation

A vulnerability in the Command Line Interface (CLI) of Cisco Firepower Threat Defense (FTD) Software and Cisco FXOS Software was identified as CVE-2022-20934. The vulnerability was discovered by Brandon Sakai of Cisco during internal security testing and was publicly disclosed on November 9, 2022. This security flaw affects Cisco Firepower 4100 Series and Firepower 9300 Series running vulnerable releases of Cisco FXOS Software (Cisco Advisory).

The vulnerability stems from improper input validation for specific CLI commands, allowing command injection attacks. It has been assigned a CVSS v3.1 base score of 6.0 (Medium) with the vector string CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N. The vulnerability is classified under CWE-77 (Improper Neutralization of Special Elements used in a Command) and CWE-78 (OS Command Injection) (NVD).

A successful exploitation of this vulnerability allows an authenticated attacker with Administrator credentials to escape the restricted command prompt and execute arbitrary commands on the underlying operating system with root privileges. In deployments where administrators are prevented from accessing expert mode (such as multi-Instance deployments or systems configured with system lockdown-sensor command), this vulnerability can be exploited to regain access to the expert mode command prompt (Cisco Advisory).

Cisco has released software updates that address this vulnerability. No workarounds are available that address this vulnerability. Customers are advised to regularly consult the advisories for Cisco products and use the Cisco Software Checker to determine their exposure and a complete upgrade solution (Cisco Advisory).