Cisco Webex flaw allows unauthenticated remote attackers to join private meetings

Pierluigi Paganini January 25, 2020

Cisco addressed a vulnerability in Cisco Webex that could be exploited by a remote, unauthenticated attacker to join a protected video conference meeting.

Cisco has addressed a high-severity flaw in the Cisco Webex video conferencing platform (CVE-2020-3142) that could be exploited by a remote, unauthenticated attacker to enter a password-protected video conference meeting.

In order to exploit the CVE-2020-3142 flaw, the attacker only needs to know the meeting ID that once inserted in the Webex mobile application for either iOS or Android will allow him to join the meeting bypassing any authentication.

“A vulnerability in Cisco Webex Meetings Suite sites and Webex Meetings Online sites could allow an unauthenticated, remote attendee to join a password-protected meeting without providing the meeting password. The connection attempt must initiate from a Webex mobile application for either iOS or Android.” reads the security advisory published by Cisco. “An unauthorized attendee could exploit this vulnerability by accessing a known meeting ID or meeting URL from the mobile device’s web browser.”

The CVE-2020-3142 vulnerability has received a CVSS score of 7.5 out of 10, it was discovered while its experts were resolving a Cisco TAC support case.

Fortunately, the presence of the attackers in the meeting is easy to detect because the unauthorized attendees would be visible in the attendee list of the meeting as a mobile attendee. 

The vulnerability affects Cisco Webex Meetings Suite sites and Cisco Meetings Online sites for versions earlier than 39.11.5 (for the former) and 40.1.3 (for the latter).  

Cisco addressed the CVE-2020-3142 vulnerability with the release of the versions 39.11.5 and later and 40.1.3 and later for Webex Meetings Suite sites and Webex Meetings Online sites.

The good news is that the Cisco Product Security Incident Response Team (PSIRT) is not aware of any attack exploiting the vulnerability in the wild.

A couple of weeks ago, Cisco Systems released security fixes for two high-severity vulnerabilities in its products, including a remote code execution flaw in the Webex video conferencing platform.

The Webex flaw addressed by Cisco resides in the web-based management interface of Webex Video Mesh, a feature that enables on-premises infrastructure for video conferencing.

This flaw affects Webex Video Mesh Software releases earlier than 2019.09.19.1956m.

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Pierluigi Paganini

(SecurityAffairs – Webex, hacking)

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