CVE-2022-29339
📋 TL;DR
This vulnerability in GPAC's BS_ReadByte() function causes a failed assertion leading to denial of service when processing malformed media files. It affects systems running vulnerable versions of GPAC multimedia framework. Attackers can crash applications using GPAC by providing specially crafted input.
💻 Affected Systems
- GPAC Multimedia Framework
📦 What is this software?
Gpac by Gpac
⚠️ Risk & Real-World Impact
Worst Case
Complete application crash and denial of service for any service using GPAC to process media files, potentially disrupting media processing pipelines.
Likely Case
Application crash when processing malicious media files, causing temporary service disruption until restart.
If Mitigated
Minimal impact with proper input validation and sandboxing; crashes would be contained to isolated processes.
🎯 Exploit Status
Exploitation requires crafting a media file that triggers the assertion failure. No authentication needed if application processes external media files.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in commit 9ea93a2ec8f555ceed1ee27294cf94822f14f10f
Vendor Advisory: https://github.com/gpac/gpac/commit/9ea93a2ec8f555ceed1ee27294cf94822f14f10f
Restart Required: Yes
Instructions:
1. Update GPAC to version including commit 9ea93a2 or later. 2. Rebuild applications using GPAC libraries. 3. Restart affected services.
🔧 Temporary Workarounds
Input Validation
allImplement strict media file validation before processing with GPAC
Process Isolation
linuxRun GPAC in isolated containers or sandboxes to limit crash impact
docker run --security-opt no-new-privileges gpac-container
🧯 If You Can't Patch
- Implement network segmentation to isolate media processing systems
- Deploy application monitoring to detect and restart crashed GPAC processes
🔍 How to Verify
Check if Vulnerable:
Check GPAC version: gpac -version and compare to commit hash. Vulnerable if before commit 9ea93a2.Check Version:
gpac -version 2>/dev/null || gpac --versionVerify Fix Applied:
Verify GPAC version includes commit 9ea93a2: git log --oneline | grep 9ea93a2📡 Detection & Monitoring
Log Indicators:
- Application crash logs mentioning BS_ReadByte
- Assertion failure in bitstream.c
- GPAC process termination
Network Indicators:
- Unusual media file uploads followed by service disruption
SIEM Query:
process_name:"gpac" AND event_type:"crash" OR "assertion failed"