CVE-2025-54493
📋 TL;DR
A critical stack-based buffer overflow vulnerability in libbiosig's MFER parsing allows arbitrary code execution when processing malicious MFER files. This affects libbiosig 3.9.0 and the master branch, potentially impacting any application or system that uses this library for biomedical signal processing.
💻 Affected Systems
- The Biosig Project libbiosig
📦 What is this software?
Libbiosig by Libbiosig Project
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with remote code execution leading to data theft, ransomware deployment, or complete system takeover.
Likely Case
Application crash (denial of service) or limited code execution within the application context.
If Mitigated
Application crash without code execution if exploit fails or protections like ASLR/stack canaries are effective.
🎯 Exploit Status
Exploitation requires crafting a malicious MFER file with specific tag 131 parameters to trigger the buffer overflow.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not yet released
Vendor Advisory: https://talosintelligence.com/vulnerability_reports/TALOS-2025-2234
Restart Required: Yes
Instructions:
1. Monitor The Biosig Project for security updates. 2. Apply patch when available. 3. Rebuild and redeploy applications using libbiosig. 4. Restart affected services.
🔧 Temporary Workarounds
Disable MFER file processing
allConfigure applications to reject or not process MFER files if not required.
Input validation wrapper
allImplement pre-processing validation for MFER files before passing to libbiosig.
🧯 If You Can't Patch
- Implement strict file upload controls and scanning for MFER files
- Isolate systems using libbiosig in restricted network segments
🔍 How to Verify
Check if Vulnerable:
Check libbiosig version: biosig-tools --version or examine source code for commit hash 35a819faCheck Version:
biosig-tools --version 2>/dev/null || echo "Check application dependencies for libbiosig"Verify Fix Applied:
Verify updated version after patch release and test with known malicious MFER files📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing MFER files
- Unexpected process termination in biosig-related applications
Network Indicators:
- Unusual MFER file transfers to systems using libbiosig
SIEM Query:
source="application_logs" AND ("libbiosig" OR "MFER") AND ("crash" OR "segfault" OR "buffer overflow")