CVE-2022-22786
📋 TL;DR
This vulnerability allows attackers to trick users into downgrading their Zoom client to a less secure version by exploiting improper version checking during updates. It affects Windows users running Zoom Client for Meetings or Zoom Rooms for Conference Room before version 5.10.0. Attackers could leverage this to install older versions with known vulnerabilities.
💻 Affected Systems
- Zoom Client for Meetings
- Zoom Rooms for Conference Room
📦 What is this software?
Rooms by Zoom
⚠️ Risk & Real-World Impact
Worst Case
Attackers could downgrade Zoom to a version with critical remote code execution vulnerabilities, gaining full system control over the victim's computer.
Likely Case
Attackers trick users into installing older Zoom versions with known security flaws, potentially leading to data theft or malware installation.
If Mitigated
With proper patching and user awareness, the risk is limited to temporary disruption if users are tricked into downgrading but quickly update.
🎯 Exploit Status
Requires user interaction (tricking user to install malicious update) and sophisticated attack chain to be fully weaponized.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.10.0 and later
Vendor Advisory: https://explore.zoom.us/en/trust/security/security-bulletin
Restart Required: Yes
Instructions:
1. Open Zoom client. 2. Click profile picture. 3. Select 'Check for Updates'. 4. Install version 5.10.0 or newer. 5. Restart Zoom after installation.
🔧 Temporary Workarounds
Disable automatic updates
windowsPrevent automatic updates that could be malicious by disabling Zoom's update feature
Not applicable - configure through Zoom settings
Require admin approval for updates
windowsConfigure Windows to require administrator approval for Zoom updates
Configure via Group Policy or Windows Settings
🧯 If You Can't Patch
- Implement network controls to block Zoom update servers except from trusted sources
- Educate users to never install Zoom updates from unofficial sources or suspicious prompts
🔍 How to Verify
Check if Vulnerable:
Check Zoom version in Settings > About. If version is below 5.10.0, system is vulnerable.Check Version:
wmic product where "name like 'Zoom%'" get versionVerify Fix Applied:
Confirm Zoom version is 5.10.0 or higher in Settings > About.📡 Detection & Monitoring
Log Indicators:
- Zoom installation logs showing downgrade attempts
- Windows Event Logs showing Zoom installation from unusual sources
Network Indicators:
- Outbound connections to non-standard Zoom update servers
- HTTP requests to download older Zoom versions
SIEM Query:
source="zoom*" AND (event="install" OR event="update") AND version<"5.10.0"