CVE-2024-36617
📋 TL;DR
CVE-2024-36617 is an integer overflow vulnerability in FFmpeg's CAF decoder that could allow attackers to cause denial of service or potentially execute arbitrary code by processing specially crafted CAF audio files. This affects systems running FFmpeg n6.1.1 that process untrusted CAF files. Users and applications that decode CAF audio files are at risk.
💻 Affected Systems
- FFmpeg
📦 What is this software?
Ffmpeg by Ffmpeg
Ffmpeg by Ffmpeg
Ffmpeg by Ffmpeg
Ffmpeg by Ffmpeg
Ffmpeg by Ffmpeg
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise if the integer overflow enables memory corruption that can be weaponized.
Likely Case
Denial of service through application crashes or hangs when processing malicious CAF files.
If Mitigated
Limited impact with proper input validation and sandboxing, potentially just failed file processing.
🎯 Exploit Status
Exploitation requires crafting a malicious CAF file that triggers the integer overflow. Public PoC exists in the gist reference.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Commit d973fcbcc2f944752ff10e6a76b0b2d9329937a7 and later
Vendor Advisory: https://github.com/ffmpeg/ffmpeg/commit/d973fcbcc2f944752ff10e6a76b0b2d9329937a7
Restart Required: No
Instructions:
1. Update FFmpeg to version after commit d973fcbcc2f944752ff10e6a76b0b2d9329937a7. 2. Rebuild from source or use updated package from your distribution. 3. Replace existing FFmpeg binaries with patched version.
🔧 Temporary Workarounds
Disable CAF decoder
allRemove or disable CAF format support in FFmpeg to prevent processing of CAF files
ffmpeg -formats | grep caf
# Recompile FFmpeg without CAF support if possible
Input validation
linuxImplement file type validation before processing with FFmpeg
# Add pre-processing check: file --mime-type input.caf | grep -v 'audio/x-caf'
🧯 If You Can't Patch
- Implement strict input validation for CAF files before processing with FFmpeg
- Run FFmpeg in sandboxed/containerized environments with limited privileges
🔍 How to Verify
Check if Vulnerable:
Check FFmpeg version and commit hash: ffmpeg -version | grep 'version\|commit'Check Version:
ffmpeg -version | head -5Verify Fix Applied:
Verify FFmpeg commit is d973fcbcc2f944752ff10e6a76b0b2d9329937a7 or later: ffmpeg -version | grep commit📡 Detection & Monitoring
Log Indicators:
- FFmpeg crashes with segmentation faults when processing CAF files
- High CPU/memory usage during CAF file decoding
Network Indicators:
- Unusual CAF file uploads to media processing services
- Multiple failed CAF decoding attempts
SIEM Query:
process.name:"ffmpeg" AND (event.action:"segmentation fault" OR exit_code:139) AND process.args:"*.caf"