CVE-2023-6602
📋 TL;DR
This vulnerability in FFmpeg's TTY Demuxer allows data exfiltration through improper parsing of non-TTY-compliant input files in HLS playlists. Attackers can craft malicious HLS playlists to potentially leak sensitive data from systems processing media files. This affects any application or service using vulnerable FFmpeg versions to process HLS content.
💻 Affected Systems
- FFmpeg
📦 What is this software?
Ffmpeg by Ffmpeg
⚠️ Risk & Real-World Impact
Worst Case
Sensitive data exfiltration from systems processing malicious HLS playlists, potentially including memory contents or file system access.
Likely Case
Limited data leakage from media processing systems, potentially exposing internal file paths or partial memory contents.
If Mitigated
No data exfiltration occurs due to proper input validation and patched FFmpeg versions.
🎯 Exploit Status
Exploitation requires crafting malicious HLS playlists and getting them processed by vulnerable FFmpeg instances.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: FFmpeg 6.1.1 and later
Vendor Advisory: https://bugzilla.redhat.com/show_bug.cgi?id=2334338
Restart Required: No
Instructions:
1. Update FFmpeg to version 6.1.1 or later. 2. For Linux distributions, use package manager: 'sudo apt update && sudo apt upgrade ffmpeg' (Debian/Ubuntu) or 'sudo yum update ffmpeg' (RHEL/CentOS). 3. Recompile applications using FFmpeg if statically linked.
🔧 Temporary Workarounds
Disable TTY Demuxer
linuxDisable the vulnerable TTY demuxer component in FFmpeg configuration.
Recompile FFmpeg with --disable-demuxer=tty flag
Input Validation
allImplement strict validation of HLS playlist inputs before processing.
🧯 If You Can't Patch
- Implement network segmentation to isolate media processing systems
- Monitor for unusual outbound traffic from media processing servers
🔍 How to Verify
Check if Vulnerable:
Check FFmpeg version: 'ffmpeg -version | grep version' and compare to 6.1.1Check Version:
ffmpeg -version | grep versionVerify Fix Applied:
Confirm FFmpeg version is 6.1.1 or later: 'ffmpeg -version | grep -E "version 6\.[1-9]\.[1-9]|version [7-9]"'📡 Detection & Monitoring
Log Indicators:
- FFmpeg segmentation faults when processing HLS files
- Unusual file access patterns in media processing logs
Network Indicators:
- Unexpected outbound connections from media processing servers
- Unusual data transfers following HLS file processing
SIEM Query:
source="ffmpeg.log" AND ("segmentation fault" OR "invalid input")