CVE-2023-45924
📋 TL;DR
This vulnerability in libglvnd's libglxproto.c allows a buffer overflow via glXGetDrawableScreen() function, potentially leading to arbitrary code execution. It affects systems using OpenGL libglvnd with the vulnerable code. The vulnerability is disputed because exploitation requires an attacker-controlled server, which is uncommon in typical usage scenarios.
💻 Affected Systems
- libglvnd (OpenGL Vendor-Neutral Dispatch library)
⚠️ 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
Remote code execution with attacker gaining full control of the affected system, potentially leading to data theft, system compromise, or lateral movement.
Likely Case
Denial of service through segmentation violation causing application crashes, with limited real-world exploitation due to the requirement for attacker-controlled servers.
If Mitigated
No impact if proper network segmentation and server trust controls are in place, as exploitation requires attacker-controlled OpenGL servers.
🎯 Exploit Status
Exploitation requires the victim to connect to an attacker-controlled OpenGL server, which limits practical attack scenarios. Proof-of-concept code is publicly available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in merge request 295 and later versions
Vendor Advisory: https://gitlab.freedesktop.org/glvnd/libglvnd/-/issues/242
Restart Required: Yes
Instructions:
1. Update libglvnd package from your distribution's repositories. 2. Restart any applications using OpenGL. 3. For source installations: pull latest code from GitLab and rebuild.
🔧 Temporary Workarounds
Restrict OpenGL server connections
allOnly allow connections to trusted OpenGL servers and implement network segmentation
Disable vulnerable functionality
linuxAvoid using glXGetDrawableScreen() function in applications
🧯 If You Can't Patch
- Implement strict network controls to prevent connections to untrusted OpenGL servers
- Monitor for segmentation faults in OpenGL applications and investigate any crashes
🔍 How to Verify
Check if Vulnerable:
Check libglvnd version: dpkg -l | grep libglvnd or rpm -qa | grep libglvnd. If version predates fix commit, system is vulnerable.Check Version:
dpkg -l | grep libglvnd # Debian/Ubuntu
rpm -qa | grep libglvnd # RHEL/Fedora
pkg info | grep libglvnd # FreeBSDVerify Fix Applied:
Verify libglvnd version is newer than commit bb06db5a. Check for presence of fix from merge request 295.📡 Detection & Monitoring
Log Indicators:
- Segmentation fault errors in OpenGL applications
- Unexpected crashes in graphics applications
- Core dumps from libglvnd processes
Network Indicators:
- Unexpected connections to OpenGL servers
- Network traffic to unusual OpenGL server ports
SIEM Query:
source="*syslog*" AND ("segmentation fault" OR "SIGSEGV") AND ("libglvnd" OR "OpenGL")🔗 References
- http://seclists.org/fulldisclosure/2024/Jan/52
- https://gitlab.freedesktop.org/glvnd/libglvnd/-/issues/242
- https://gitlab.freedesktop.org/glvnd/libglvnd/-/merge_requests/295
- http://packetstormsecurity.com/files/176807/libglvnd-bb06db5a-Buffer-Overflow-Null-Pointer.html
- http://seclists.org/fulldisclosure/2024/Jan/52
- https://gitlab.freedesktop.org/glvnd/libglvnd/-/issues/242
- https://gitlab.freedesktop.org/glvnd/libglvnd/-/merge_requests/295
