CVE-2024-49777
📋 TL;DR
A heap-based buffer overflow vulnerability in tsMuxer allows attackers to execute arbitrary code, cause denial of service, or disclose sensitive information by processing a specially crafted MKV video file. This affects users who process untrusted video files with the vulnerable version of tsMuxer. The vulnerability is particularly dangerous as it can be triggered without authentication.
💻 Affected Systems
- tsMuxer
📦 What is this software?
Tsmuxer by Justdan96
⚠️ Risk & Real-World Impact
Worst Case
Full remote code execution with the privileges of the tsMuxer process, potentially leading to complete system compromise.
Likely Case
Denial of service (application crash) when processing malicious MKV files, with potential information disclosure from heap memory.
If Mitigated
Application crash without code execution if exploit fails or memory protections are in place.
🎯 Exploit Status
The GitHub issue contains technical details and proof-of-concept information. Crafting a reliable exploit requires understanding of heap manipulation techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check latest tsMuxer releases after March 14, 2024
Vendor Advisory: https://github.com/justdan96/tsMuxer/issues/842
Restart Required: No
Instructions:
1. Check current tsMuxer version. 2. Update to the latest version from the official tsMuxer repository. 3. Verify the fix by checking version or testing with known malicious files.
🔧 Temporary Workarounds
Disable MKV processing
allPrevent tsMuxer from processing MKV files by modifying configuration or input validation.
Run with reduced privileges
linuxExecute tsMuxer with minimal system privileges to limit potential damage from exploitation.
sudo -u nobody tsMuxer [options]
🧯 If You Can't Patch
- Implement strict input validation - only allow processing of video files from trusted sources
- Deploy tsMuxer in isolated containers or sandboxes with no network access
🔍 How to Verify
Check if Vulnerable:
Check if tsMuxer version is nightly-2024-03-14-01-51-12 or earlier. Test with the proof-of-concept MKV file from the GitHub issue.Check Version:
tsMuxeR --version or check the application about dialogVerify Fix Applied:
Update to the latest tsMuxer version and verify it no longer crashes when processing the proof-of-concept file.📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults or access violations
- Unexpected process termination when processing MKV files
Network Indicators:
- Unusual network connections from tsMuxer process after file processing
SIEM Query:
Process: tsMuxeR AND (EventID: 1000 OR Signal: SIGSEGV) AND FileExtension: .mkv