June 27, 2022

TheCyberThrone

Thinking Security ! Always

Zoom RCE bug Haunts ! Patch it

A bunch of bugs identified in Zoom that can be exploited to compromise another user over chat by sending specially crafted Extensible Messaging and Presence Protocol (XMPP) messages.

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Below are the vulnerabilities addressed

  • CVE-2022-22784 – Improper XML Parsing in Zoom Client for Meetings
  • CVE-2022-22785 – Improperly constrained session cookies in Zoom Client for Meetings
  • CVE-2022-22786 – Update package downgrade in Zoom Client for Meetings for Windows
  • CVE-2022-22787 – Insufficient hostname validation during server switch in Zoom Client for Meetings

The most severe flaw addressed by Zoom is tracked as CVE-2022-22784 with a CVSS score: 8.1, it is an Improper XML Parsing in Zoom Client for Meetings.

A threat actor can exploit the flaw to break out of the current XMPP message context and create a new message context to have the receiving user’s client perform a variety of actions.

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Chaining the above vulnerabilities, an attacker can trick a vulnerable client into connecting to a rogue server, potentially leading to arbitrary code execution due to an update package downgrade in Zoom Client for Windows that could allow the installation of a less secure version.

This issue could be used in a more sophisticated attack to trick a user into downgrading their Zoom client to a less secure version.Zoom users are recommended to install the latest version (5.10.0) that addresses the above vulnerabilities.

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