CVE-2022-22784: Zoom Meetings XXE Vulnerability

CVE-2022-22784 Overview

CVE-2022-22784 is an XML injection vulnerability (CWE-91) affecting the Zoom Client for Meetings across all major platforms including Android, iOS, Linux, MacOS, and Windows. The vulnerability stems from improper parsing of XML stanzas in XMPP messages, which allows malicious users to break out of the current XMPP message context and create new message contexts. This could enable attackers to manipulate the receiving user's client to perform various actions, including forging XMPP messages that appear to originate from the server.

Critical Impact

Attackers can exploit improper XML parsing to forge XMPP messages and manipulate Zoom client behavior, potentially compromising confidentiality and integrity of communications.

Affected Products

• Zoom Meetings for Android (versions before 5.10.0)
• Zoom Meetings for iOS (versions before 5.10.0)
• Zoom Meetings for Linux (versions before 5.10.0)
• Zoom Meetings for MacOS (versions before 5.10.0)
• Zoom Meetings for Windows (versions before 5.10.0)

Discovery Timeline

• 2022-05-18 - CVE-2022-22784 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2022-22784

Vulnerability Analysis

This XML injection vulnerability (CWE-91) exists in the XMPP message handling component of the Zoom Client for Meetings. XMPP (Extensible Messaging and Presence Protocol) is used by Zoom for real-time messaging and presence information exchange between clients and servers. The vulnerability arises because the Zoom client fails to properly validate and sanitize XML stanzas within incoming XMPP messages.

When an attacker sends a specially crafted XMPP message containing malicious XML content, the parser incorrectly interprets the injected XML elements as legitimate message boundaries. This allows the attacker to escape the current message context and inject arbitrary XML stanzas that the client will process as valid server communications.

Root Cause

The root cause is improper input validation in the XMPP message parser. The Zoom client does not adequately sanitize or escape special XML characters and stanza delimiters within received XMPP messages. This failure to properly parse XML boundaries enables injection attacks where malicious XML content can break out of its intended context and be interpreted as separate, legitimate protocol messages.

Attack Vector

The attack is network-based and requires the attacker to have low-privileged access to send XMPP messages to target users. No user interaction is required for exploitation. An attacker can leverage this vulnerability by:

1. Crafting malicious XMPP messages containing embedded XML stanzas designed to escape the current message context
2. Sending these messages to target users through the Zoom messaging infrastructure
3. The receiving client's flawed XML parser processes the injected stanzas as legitimate protocol messages
4. The attacker can then forge messages that appear to come from the server, potentially manipulating client behavior or extracting sensitive information

The vulnerability can be used to forge XMPP messages from the server, enabling sophisticated attacks that could compromise the integrity and confidentiality of communications.

Detection Methods for CVE-2022-22784

Indicators of Compromise

• Unusual or malformed XMPP message traffic patterns containing nested or escaped XML stanzas
• Zoom client logs showing unexpected message context switches or parsing errors
• Network traffic containing XMPP messages with suspicious XML injection patterns such as premature stanza closures
• Client behavior inconsistent with legitimate server communications

Detection Strategies

• Monitor network traffic for XMPP messages containing potentially malicious XML constructs or unexpected stanza boundaries
• Implement deep packet inspection rules to detect XML injection patterns in XMPP communications
• Deploy endpoint detection solutions to identify Zoom clients running vulnerable versions (prior to 5.10.0)
• Audit Zoom client versions across the organization to identify systems requiring updates

Monitoring Recommendations

• Enable verbose logging on Zoom clients where possible to capture XMPP message parsing anomalies
• Configure network monitoring tools to alert on suspicious XML patterns in messaging protocols
• Establish baseline communication patterns for Zoom XMPP traffic to detect deviations
• Integrate Zoom client version inventory with vulnerability management systems

How to Mitigate CVE-2022-22784

Immediate Actions Required

• Update all Zoom Client for Meetings installations to version 5.10.0 or later immediately
• Verify updates have been applied across all platforms (Android, iOS, Linux, MacOS, Windows)
• Implement network segmentation to limit exposure of vulnerable clients if immediate patching is not possible
• Review recent communications for signs of exploitation or message manipulation

Patch Information

Zoom has addressed this vulnerability in Zoom Client for Meetings version 5.10.0. Organizations should upgrade to this version or later to remediate the issue. For detailed patch information and download links, refer to the Zoom Security Bulletin.

Workarounds

• Restrict Zoom messaging functionality for users on vulnerable versions until patches can be applied
• Implement network-level filtering to detect and block potentially malicious XMPP traffic patterns
• Consider deploying application-layer firewalls capable of inspecting and sanitizing XMPP traffic
• Enforce automatic updates for Zoom clients through enterprise management policies where available

# Verify Zoom client version on systems
# Linux/MacOS - Check installed Zoom version
zoom --version

# Windows PowerShell - Query installed Zoom version
Get-WmiObject -Class Win32_Product | Where-Object {$_.Name -like "*Zoom*"} | Select-Object Name, Version