CVE-2022-26967
📋 TL;DR
CVE-2022-26967 is a heap-based buffer overflow vulnerability in GPAC's gf_base64_encode function that can be triggered via MP4Box. This allows attackers to execute arbitrary code or cause denial of service. Users of GPAC multimedia framework and MP4Box tool are affected.
💻 Affected Systems
- GPAC
- MP4Box
📦 What is this software?
Gpac by Gpac
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Denial of service causing application crashes and service disruption.
If Mitigated
Limited impact with proper input validation and memory protections enabled.
🎯 Exploit Status
Exploitation requires crafting malicious input but doesn't require authentication. Proof-of-concept exists in GitHub issues.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: GPAC 2.1 or later
Vendor Advisory: https://github.com/gpac/gpac/issues/2138
Restart Required: No
Instructions:
1. Update GPAC to version 2.1 or later. 2. For package managers: 'sudo apt update && sudo apt upgrade gpac' (Debian/Ubuntu) or equivalent for your distribution. 3. Recompile from source if using custom builds.
🔧 Temporary Workarounds
Disable MP4Box processing
linuxTemporarily disable or restrict MP4Box usage until patching is complete
sudo chmod 000 /usr/bin/MP4Box
sudo mv /usr/bin/MP4Box /usr/bin/MP4Box.disabled
Input validation wrapper
linuxCreate wrapper script to validate input files before processing with MP4Box
#!/bin/bash
# Validate file size and type before processing
if [ -f "$1" ] && [ $(stat -c%s "$1") -lt 10000000 ]; then
MP4Box "$1"
else
echo "File validation failed"
exit 1
fi
🧯 If You Can't Patch
- Implement strict input validation for all media files processed by GPAC/MP4Box
- Isolate GPAC/MP4Box processes in containers or sandboxes with limited privileges
🔍 How to Verify
Check if Vulnerable:
Check GPAC version: 'gpac -version' or 'MP4Box -version'. If output shows version 2.0, system is vulnerable.Check Version:
gpac -version 2>&1 | head -1Verify Fix Applied:
After update, verify version shows 2.1 or later: 'gpac -version | grep -q "2.1" && echo "Patched" || echo "Still vulnerable"'📡 Detection & Monitoring
Log Indicators:
- Segmentation fault or crash logs from MP4Box/gpac processes
- Unusual memory allocation patterns in system logs
Network Indicators:
- Unexpected network connections from GPAC processes
- Large or malformed media file transfers to processing systems
SIEM Query:
process_name:"MP4Box" AND (event_type:"crash" OR memory_usage:"abnormal")