CVE-2024-9498
📋 TL;DR
This CVE describes a DLL hijacking vulnerability in the USBXpress SDK installer where an uncontrolled search path allows attackers to place malicious DLLs in directories searched by the installer. This can lead to privilege escalation and arbitrary code execution when users run the impacted installer. Organizations using Silicon Labs USBXpress SDK are affected.
💻 Affected Systems
- Silicon Labs USBXpress SDK
⚠️ 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
Full system compromise with administrative privileges, allowing attackers to install persistent malware, steal credentials, and pivot to other systems.
Likely Case
Local privilege escalation leading to installation of backdoors, credential theft, and lateral movement within the network.
If Mitigated
Limited impact with proper application whitelisting and user privilege restrictions preventing DLL execution from untrusted locations.
🎯 Exploit Status
Requires local access and ability to place malicious DLL in directory searched by installer. Social engineering may be needed to trick users into running installer from malicious location.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Updated USBXpress SDK installer
Vendor Advisory: https://community.silabs.com/068Vm00000JUQwd
Restart Required: No
Instructions:
1. Download the updated USBXpress SDK installer from Silicon Labs. 2. Uninstall any existing vulnerable versions. 3. Install the updated version. 4. Verify installation completes without errors.
🔧 Temporary Workarounds
Restrict DLL search path
windowsUse Windows policies to restrict DLL search paths and prevent loading from current directory
Set CWDIllegalInDllSearch registry value to 0xFFFFFFFF
🧯 If You Can't Patch
- Implement application whitelisting to prevent execution of USBXpress SDK installer from untrusted locations
- Restrict user privileges to prevent standard users from installing software or executing installers
🔍 How to Verify
Check if Vulnerable:
Check if USBXpress SDK installer exists on system and verify version against vendor advisoryCheck Version:
Check installer properties or consult vendor documentation for version informationVerify Fix Applied:
Verify the updated installer version is installed and test DLL loading behavior📡 Detection & Monitoring
Log Indicators:
- Windows Event Logs showing DLL loading from unusual locations
- Process Monitor logs showing installer searching for DLLs in current directory
Network Indicators:
- Unusual outbound connections following installer execution
- DNS queries to suspicious domains after installer runs
SIEM Query:
Process creation where parent process is USBXpress installer AND DLL loaded from current directory OR user writable location