CVE-2023-48011
📋 TL;DR
CVE-2023-48011 is a heap-use-after-free vulnerability in GPAC's movie_fragments.c that allows attackers to execute arbitrary code or cause denial of service by processing specially crafted media files. This affects applications using GPAC for multimedia processing, particularly media players, streaming servers, and video editing tools. Attackers can exploit this by tricking users into opening malicious media files.
💻 Affected Systems
- GPAC Multimedia Framework
- Applications using GPAC library (MP4Box, Osmo4, etc.)
📦 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
Application crash (denial of service) with potential for limited code execution in the context of the vulnerable application
If Mitigated
Application crash without code execution if memory protections (ASLR, DEP) are effective
🎯 Exploit Status
Exploitation requires crafting specific MP4 fragment files. No public exploits available as of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in commit c70f49dda4946d6db6aa55588f6a756b76bd84ea and later
Vendor Advisory: https://github.com/gpac/gpac/commit/c70f49dda4946d6db6aa55588f6a756b76bd84ea
Restart Required: Yes
Instructions:
1. Update GPAC to latest version from official repository
2. Rebuild applications using GPAC library
3. Restart affected services
4. Verify fix with test media files
🔧 Temporary Workarounds
Disable MP4 fragment processing
allConfigure applications to reject or skip MP4 movie fragments
# Application-specific configuration required
Input validation for media files
allImplement strict validation of uploaded media files before processing
# Use file type verification and size limits
🧯 If You Can't Patch
- Implement network segmentation to isolate media processing systems
- Deploy application allowlisting to prevent unauthorized code execution
🔍 How to Verify
Check if Vulnerable:
Check GPAC version: gpac -version | grep 'GPAC' and compare to vulnerable version rangeCheck Version:
gpac -version 2>/dev/null | head -1Verify Fix Applied:
Test with known safe MP4 fragment files and monitor for crashes. Verify commit hash includes c70f49dda4946d6db6aa55588f6a756b76bd84ea📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults
- Memory access violation errors in system logs
- GPAC process termination with error codes
Network Indicators:
- Unusual media file uploads to web applications
- MP4 fragment files from untrusted sources
SIEM Query:
process_name:"gpac" AND (event_type:"crash" OR error_code:"SIGSEGV")