CVE-2014-125020
📋 TL;DR
This critical vulnerability in FFmpeg 2.0 allows remote attackers to trigger memory corruption via the decode_update_thread_context function, potentially leading to arbitrary code execution. It affects systems running vulnerable FFmpeg versions that process untrusted media files. The attack can be initiated remotely without authentication.
💻 Affected Systems
- FFmpeg
📦 What is this software?
Ffmpeg by Ffmpeg
⚠️ 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) or limited memory corruption allowing information disclosure
If Mitigated
Minimal impact if proper input validation and memory protections are in place
🎯 Exploit Status
Memory corruption vulnerabilities often lead to reliable exploits, though no public PoC is referenced
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in commit 1f097d168d and later FFmpeg versions
Vendor Advisory: http://git.videolan.org/?p=ffmpeg.git;a=commit;h=1f097d168d
Restart Required: Yes
Instructions:
1. Update FFmpeg to version 2.1 or later
2. Apply patch from commit 1f097d168d if using custom build
3. Restart all services using FFmpeg
🔧 Temporary Workarounds
Disable vulnerable codec support
allRemove or disable codecs that trigger the vulnerable decode_update_thread_context function
ffmpeg -codecs | grep vulnerable_codec
Recompile FFmpeg without vulnerable components
Input validation and sandboxing
linuxImplement strict input validation and run FFmpeg in sandboxed/containerized environment
Use seccomp, AppArmor, or Docker with limited capabilities
🧯 If You Can't Patch
- Network segmentation: Isolate systems running vulnerable FFmpeg versions
- Strict input control: Only allow trusted, verified media files to be processed
🔍 How to Verify
Check if Vulnerable:
Check FFmpeg version: ffmpeg -version | grep 'version 2.0'Check Version:
ffmpeg -version | head -1Verify Fix Applied:
Verify FFmpeg version is 2.1 or later, or check for commit 1f097d168d in build📡 Detection & Monitoring
Log Indicators:
- FFmpeg segmentation faults
- Memory access violation errors
- Unexpected process termination
Network Indicators:
- Unexpected media file uploads to processing systems
- Suspicious outbound connections from FFmpeg processes
SIEM Query:
process_name:ffmpeg AND (event_type:crash OR exit_code:139)