Cisco Expressway Series and TelePresence Video Communication Server Cross-Site Scripting Vulnerability

Vulnerability

The vulnerability is a cross-site scripting (XSS) issue in the web-based management interface of Cisco Expressway Series and Cisco TelePresence Video Communication Server (VCS). It exists in software releases earlier than X12.5.4. The flaw is due to insufficient validation of user-supplied input by the web-based management interface, enabling an attacker to inject arbitrary script code.

Exploitation

An unauthenticated, remote attacker can exploit this vulnerability by persuading a user of the web-based management interface to click a malicious link. No special network position or authentication is required beyond standard web access to the interface [1]. The attacker must craft the link and convince a user to interact with it (e.g., via social engineering or embedding in a legitimate-looking page).

Impact

A successful exploit allows the attacker to execute arbitrary script code in the context of the affected interface or access sensitive browser-based information. This can lead to disclosure of session tokens, credentials, or other sensitive data stored in the browser, potentially compromising the management session and the device itself.

Mitigation

Cisco has released software updates to address this vulnerability. Customers should upgrade to Cisco Expressway Series and TelePresence VCS Release X12.5.4 or later. There are no workarounds available [1]. The fix was published on 2019-10-16.