Cisco on Wednesday announced patches for a critical vulnerability in its Expressway series and TelePresence Video Communication Server (VCS) enterprise collaboration and video communication solutions.
Tracked as CVE-2023-20105 (CVSS score of 9.6), the vulnerability allows an administrator with ‘read-only’ rights to elevate their privileges to ‘read-write’.
The issue exists because password change requests are not handled properly, allowing an attacker authenticated as a ‘read-only’ administrator to send a crafted request to change the password for any user account on the system, including that of a ‘read-write’ administrator, and then impersonate them.
Cisco Expressway series and TelePresence VCS deployments that have granted CLI access to a read-only administrator are also vulnerable to CVE-2023-20192, a high-severity vulnerability also leading to escalation of privilege. According to Cisco, CLI access is disabled by default for read-only users.
“This vulnerability is due to incorrect implementation of user role permissions. An attacker could exploit this vulnerability by authenticating to the application as a read-only CLI administrator and issuing commands normally reserved for administrators with read-write capabilities,” Cisco explains in an advisory.
An attacker could exploit this flaw to execute commands they would not normally have access to, including modifying system configuration parameters.
Expressway series and TelePresence VCS version 14.2.1 contains patches for CVE-2023-20105, while version 14.3.0 addresses CVE-2023-20192.
This week, Cisco also announced patches for high-severity denial-of-service (DoS) bugs in the Unified Communications Manager IM & Presence service and Firepower 2100 series appliances, as well as a high-severity code execution flaw in AnyConnect Secure Mobility Client and Secure Client software for Windows.
Cisco also released fixes for two medium-severity vulnerabilities, namely a DoS bug in Unified Communications Manager and Unified Communications Manager Session Management Edition and an escalation of privilege issue in Secure Workload.
Additionally, the company warned that no patches will be released for a medium-severity cross-site scripting (XSS) flaw in Small Business 200, 300, and 500 series switches, which reached end-of-life (EoL) in or before 2019.
The tech giant says it is not aware of any of these vulnerabilities being exploited in malicious attacks. Additional information on the vulnerabilities can be found on Cisco’s product security page.