CVE-2024-7055
📋 TL;DR
A critical heap-based buffer overflow vulnerability exists in FFmpeg's PNM image decoder (pnm_decode_frame function). Attackers can exploit this remotely by sending specially crafted PNM files, potentially leading to arbitrary code execution. This affects all systems running FFmpeg versions up to 7.0.1 that process untrusted PNM images.
💻 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 with the privileges of the FFmpeg process, potentially leading to complete system compromise.
Likely Case
Application crash (denial of service) or limited memory corruption leading to unstable behavior.
If Mitigated
No impact if proper input validation and memory protections are in place, though exploitation risk remains.
🎯 Exploit Status
Proof-of-concept exploit code is publicly available on GitHub, making exploitation straightforward for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.0.2
Vendor Advisory: https://ffmpeg.org/
Restart Required: Yes
Instructions:
1. Download FFmpeg 7.0.2 or later from https://ffmpeg.org/download.html. 2. Compile and install the new version. 3. Restart any services or applications using FFmpeg.
🔧 Temporary Workarounds
Disable PNM decoder
allRemove or disable the PNM decoder in FFmpeg to prevent exploitation.
Recompile FFmpeg with --disable-decoder=pnm
Input validation
allImplement strict input validation to reject suspicious PNM files before processing.
🧯 If You Can't Patch
- Implement network segmentation to isolate FFmpeg instances from untrusted networks.
- Use application allowlisting to restrict which files FFmpeg can process.
🔍 How to Verify
Check if Vulnerable:
Check FFmpeg version: if it's 7.0.1 or earlier, it's vulnerable. Test with the public PoC to confirm exploitability.Check Version:
ffmpeg -version | grep 'version'Verify Fix Applied:
Verify FFmpeg version is 7.0.2 or later. Test with the PoC to ensure it no longer crashes or exhibits abnormal behavior.📡 Detection & Monitoring
Log Indicators:
- Segmentation fault or crash logs from FFmpeg processes
- Unexpected memory access errors in system logs
Network Indicators:
- Inbound connections delivering PNM files to FFmpeg services
- Unusual outbound connections from FFmpeg processes post-exploitation
SIEM Query:
source="*ffmpeg*" AND (event="segmentation fault" OR event="buffer overflow")