CVE-2023-20248

Description

The vulnerability in the web-based management interface of Cisco TelePresence Management Suite (TMS) Software could allow an authenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the interface. This vulnerability is due to insufficient input validation by the web-based management interface.
An attacker could exploit these vulnerabilities by string termination injection in a script block inside the video address parameter of the new conference. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

Proof-of-concept

1. Login to CMS app with the Operator access
2. Navigate to „Booking -> New Conference”
3. Check „Externally Hosted”, and in the „Video address” field enter the following string:
   "});alert(document.domain);$('STM').keyup(function(){//

4. Click on „Save Conference” button and then „Meeting Details” button

Timeline

• 24-04-2023 - Vulnerability reported to vendor
• 24-04-2023 - First response from Cisco to percise versions tested
• 27-07-2023 - Successful reproduction of the vulnerability by Cisco
• 11-01-2024 - Security advisory is published by Cisco

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-tms-portal-xss-AXNeVg3s
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-20248