CVE-2025-25942
📋 TL;DR
A memory leak vulnerability in Bento4's mp4fragment tool allows attackers to cause information disclosure by processing specially crafted invalid MP4 files. This affects systems using Bento4 v1.6.0-641 for media processing. The vulnerability could expose sensitive memory contents to attackers.
💻 Affected Systems
- Bento4
📦 What is this software?
Bento4 by Axiosys
⚠️ Risk & Real-World Impact
Worst Case
Attackers could extract sensitive information from process memory, potentially including credentials, encryption keys, or other application data.
Likely Case
Information disclosure of memory contents, possibly revealing fragments of sensitive data or causing denial of service through resource exhaustion.
If Mitigated
Limited impact with proper input validation and sandboxing, though memory contents could still be exposed.
🎯 Exploit Status
Exploitation requires ability to submit specially crafted MP4 files to mp4fragment tool. No authentication bypass needed if tool is accessible.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check GitHub issue for latest fix
Vendor Advisory: https://github.com/axiomatic-systems/Bento4/issues/993
Restart Required: No
Instructions:
1. Monitor GitHub issue #993 for official patch
2. Update Bento4 to patched version when available
3. Recompile any applications using Bento4 libraries
🔧 Temporary Workarounds
Disable mp4fragment tool
allRemove or restrict access to the vulnerable mp4fragment binary
sudo chmod 000 /path/to/mp4fragment
sudo mv /path/to/mp4fragment /path/to/mp4fragment.disabled
Input validation
allValidate MP4 files before processing with mp4fragment
# Use file validation script before mp4fragment
# Example: validate_mp4.py input.mp4 && mp4fragment input.mp4 output.mp4
🧯 If You Can't Patch
- Restrict mp4fragment tool to trusted users only
- Process MP4 files in isolated containers with memory limits
🔍 How to Verify
Check if Vulnerable:
Check Bento4 version: mp4fragment --version | grep '1.6.0-641'Check Version:
mp4fragment --versionVerify Fix Applied:
Verify version is updated beyond v1.6.0-641 and test with known invalid MP4 files📡 Detection & Monitoring
Log Indicators:
- High memory usage by mp4fragment processes
- Repeated mp4fragment crashes with invalid files
- Unusual file processing patterns
Network Indicators:
- Bulk MP4 file uploads to systems running mp4fragment
SIEM Query:
process_name='mp4fragment' AND (memory_usage>threshold OR exit_code!=0)