CVE-2022-4568
📋 TL;DR
A directory permissions vulnerability in Lenovo System Update allows local authenticated users to write arbitrary files to protected directories, potentially leading to privilege escalation. This affects Lenovo devices running vulnerable versions of System Update software. Attackers could gain SYSTEM-level privileges by exploiting improper directory permissions.
💻 Affected Systems
- Lenovo System Update
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Local attacker gains SYSTEM privileges, enabling complete system compromise, persistence mechanisms, credential theft, and lateral movement.
Likely Case
Local authenticated user elevates privileges to install malware, modify system configurations, or bypass security controls.
If Mitigated
With proper access controls and least privilege principles, impact limited to user-level operations only.
🎯 Exploit Status
Exploitation requires local authenticated access. The vulnerability involves directory permission manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.07.0134 and later
Vendor Advisory: https://support.lenovo.com/us/en/product_security/LEN-103545
Restart Required: Yes
Instructions:
1. Open Lenovo System Update. 2. Check for updates. 3. Install version 5.07.0134 or later. 4. Restart the system.
🔧 Temporary Workarounds
Disable Lenovo System Update Service
windowsTemporarily disable the System Update service to prevent exploitation
sc stop "Lenovo System Update Service"
sc config "Lenovo System Update Service" start= disabled
Remove Write Permissions from Vulnerable Directories
windowsRestrict write access to System Update directories
icacls "C:\Program Files (x86)\Lenovo\System Update" /deny Users:(OI)(CI)W
🧯 If You Can't Patch
- Implement strict least privilege policies to limit standard user capabilities
- Monitor for suspicious file writes to System Update directories using file integrity monitoring
🔍 How to Verify
Check if Vulnerable:
Check System Update version in Control Panel > Programs and Features. Versions below 5.07.0134 are vulnerable.Check Version:
wmic product where "name like 'Lenovo System Update%'" get versionVerify Fix Applied:
Verify System Update version is 5.07.0134 or higher after update installation.📡 Detection & Monitoring
Log Indicators:
- Unusual file writes to Lenovo System Update directories
- Process creation from System Update with elevated privileges
Network Indicators:
- No network indicators - local privilege escalation only
SIEM Query:
EventID=4688 AND (NewProcessName LIKE '%SystemUpdate%' OR ParentProcessName LIKE '%SystemUpdate%') AND IntegrityLevel='System'