CVE-2023-46932
📋 TL;DR
A heap buffer overflow vulnerability in GPAC's MP4Box allows attackers to execute arbitrary code or cause denial of service by exploiting the str2ulong class in avilib.c. This affects users of GPAC version 2.3-DEV-rev617-g671976fcc-master, particularly those processing untrusted media files.
💻 Affected Systems
- GPAC
- MP4Box
📦 What is this software?
Gpac by Gpac
⚠️ Risk & Real-World Impact
Worst Case
Full remote code execution leading to system compromise, data theft, or persistent backdoor installation.
Likely Case
Denial of service via application crashes or limited code execution in constrained environments.
If Mitigated
Minimal impact if patched or with strict input validation and sandboxing.
🎯 Exploit Status
Exploitation likely requires crafting a malicious media file; no public proof-of-concept is known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check GPAC GitHub repository for updates post-rev617-g671976fcc-master
Vendor Advisory: https://github.com/gpac/gpac/issues/2669
Restart Required: No
Instructions:
1. Visit the GPAC GitHub repository. 2. Update to the latest version that includes the fix. 3. Recompile and reinstall if using source code.
🔧 Temporary Workarounds
Restrict File Processing
allLimit MP4Box to trusted media files only and avoid processing untrusted inputs.
Use Sandboxing
linuxRun MP4Box in a sandboxed environment to contain potential exploits.
firejail --net=none mp4box [options] (Linux)
sandbox-exec -f profile.sb mp4box [options] (macOS)
🧯 If You Can't Patch
- Disable or remove MP4Box from production systems if not essential.
- Implement strict network and file access controls to limit exposure to untrusted media.
🔍 How to Verify
Check if Vulnerable:
Check GPAC version with 'mp4box -version' and compare to affected version 2.3-DEV-rev617-g671976fcc-master.Check Version:
mp4box -versionVerify Fix Applied:
Update GPAC and run 'mp4box -version' to confirm version is newer than the vulnerable one.📡 Detection & Monitoring
Log Indicators:
- Application crashes or abnormal termination logs from MP4Box
- Memory access violation errors in system logs
Network Indicators:
- Unusual outbound connections from systems running MP4Box
- Suspicious file uploads to media processing services
SIEM Query:
source="*mp4box*" AND (event_type="crash" OR event_type="error")