On Wednesday, Cisco rolled out security updates to address a critical flaw impacting its IP Phone 6800, 7800, 7900, and 8800 Series products. The vulnerability, tracked as CVE-2023-20078, is rated 9.8 out of 10 on the CVSS scoring system and is described as a command injection bug in the web-based management interface arising due to insufficient validation of user-supplied input. Successful exploitation of the bug could allow an unauthenticated, remote attacker to inject arbitrary commands that are executed with the highest privileges on the underlying operating system.
"An attacker could exploit this vulnerability by sending a crafted request to the web-based management interface," Cisco said in an alert published on March 1, 2023. Also patched by the company is a high-severity denial-of-service (DoS) vulnerability affecting the same set of devices, as well as the Cisco Unified IP Conference Phone 8831 and Unified IP Phone 7900 Series. CVE-2023-20079 (CVSS score: 7.5), also a result of insufficient validation of user-supplied input in the web-based management interface, could be abused by an adversary to cause a DoS condition.
While Cisco has released Cisco Multiplatform Firmware version 11.3.7SR1 to resolve CVE-2023-20078, the company said it does not plan to fix CVE-2023-20079, as both the Unified IP Conference Phone models have entered end-of-life (EoL).