CVE-2024-39826
📋 TL;DR
A race condition vulnerability in Zoom Workplace Team Chat for Windows allows authenticated users to potentially access sensitive information through network access. This affects Zoom Workplace apps and SDKs on Windows systems. Only authenticated users can exploit this vulnerability.
💻 Affected Systems
- Zoom Workplace Apps
- Zoom SDKs
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Authenticated attacker could access sensitive chat data, files, or user information from other users' Team Chat sessions.
Likely Case
Limited information disclosure within the same organization, potentially exposing internal communications or shared files.
If Mitigated
With proper access controls and monitoring, impact is minimal as it requires authenticated access and specific timing conditions.
🎯 Exploit Status
Race conditions require precise timing and authenticated access, making exploitation non-trivial but possible.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check latest Zoom Workplace updates via Zoom advisory ZSB-24023
Vendor Advisory: https://www.zoom.com/en/trust/security-bulletin/zsb-24023
Restart Required: Yes
Instructions:
1. Open Zoom Workplace application
2. Navigate to Settings > Check for Updates
3. Install any available updates
4. Restart the application
🔧 Temporary Workarounds
Disable Team Chat Feature
windowsTemporarily disable Team Chat functionality until patched
Administrative controls via Zoom admin portal to disable Team Chat
Restrict Network Access
windowsLimit Zoom application network access to required domains only
Firewall rules to restrict Zoom.exe to *.zoom.us and required endpoints
🧯 If You Can't Patch
- Implement strict access controls and monitoring for Zoom Team Chat usage
- Educate users about not sharing sensitive information via Team Chat until patched
🔍 How to Verify
Check if Vulnerable:
Check Zoom version against affected versions in ZSB-24023 advisoryCheck Version:
In Zoom: Settings > About > Version numberVerify Fix Applied:
Verify Zoom version is updated beyond vulnerable versions listed in advisory📡 Detection & Monitoring
Log Indicators:
- Unusual chat access patterns
- Multiple rapid chat session requests from same user
Network Indicators:
- Abnormal timing of chat-related network requests
- Concurrent chat session establishment attempts
SIEM Query:
zoom AND (chat OR team) AND (race OR concurrent OR timing) AND windows