CVE-2024-33578
📋 TL;DR
A DLL hijack vulnerability in Lenovo Leyun allows local attackers to execute arbitrary code with elevated privileges by placing a malicious DLL in a location where the application searches for it. This affects systems running vulnerable versions of Lenovo Leyun software. Attackers need local access to the system to exploit this vulnerability.
💻 Affected Systems
- Lenovo Leyun
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with administrative privileges, allowing installation of persistent malware, data theft, and lateral movement within the network.
Likely Case
Local privilege escalation leading to unauthorized access to sensitive system resources and potential installation of additional malware.
If Mitigated
Limited impact with proper application whitelisting and user privilege restrictions in place.
🎯 Exploit Status
DLL hijacking is a well-known attack technique. Exploitation requires the attacker to place a malicious DLL in a writable directory that Leyun searches before legitimate system directories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in reference, but Lenovo has released a fix
Vendor Advisory: https://iknow.lenovo.com.cn/detail/423563
Restart Required: Yes
Instructions:
1. Visit the Lenovo advisory URL. 2. Download the latest version of Lenovo Leyun. 3. Install the update following Lenovo's instructions. 4. Restart the system.
🔧 Temporary Workarounds
Restrict DLL search paths
windowsConfigure application to use absolute paths for DLL loading or restrict search paths to trusted directories only
Not applicable - requires application configuration changes
Remove unnecessary write permissions
windowsRemove write permissions from directories where Leyun searches for DLLs to prevent malicious DLL placement
icacls "C:\path\to\leyun\directory" /deny Users:(OI)(CI)W
🧯 If You Can't Patch
- Implement application whitelisting to prevent execution of unauthorized DLLs
- Run Leyun with minimal necessary privileges, not as administrator
🔍 How to Verify
Check if Vulnerable:
Check Leyun version against Lenovo's advisory. Monitor for DLL loading from untrusted locations using Process Monitor.Check Version:
Check Leyun application properties or about dialog for version informationVerify Fix Applied:
Verify Leyun version matches patched version from Lenovo advisory. Test that DLL hijacking attempts fail.📡 Detection & Monitoring
Log Indicators:
- DLL loading from unusual locations
- Process creation with unexpected parent processes
- Failed DLL loading attempts
Network Indicators:
- Unusual outbound connections from Leyun process after exploitation
SIEM Query:
Process Creation where (Image contains "leyun" OR ParentImage contains "leyun") AND CommandLine contains "dll"