CVE-2025-54485
📋 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 using this library for medical waveform data 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 control.
Likely Case
Local privilege escalation or application compromise when users open malicious MFER files, potentially leading to lateral movement within networks.
If Mitigated
Denial of service or application crash if exploit fails or is blocked by security controls.
🎯 Exploit Status
Exploitation requires user or system to process a malicious MFER file. No authentication needed for file parsing.
🛠️ 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. Recompile/reinstall applications using libbiosig. 4. Restart affected services.
🔧 Temporary Workarounds
Disable MFER file processing
allConfigure applications to reject or not process MFER files until patched.
Application-specific configuration required
Input validation and sanitization
allImplement strict validation of MFER file inputs before passing to libbiosig.
Implement custom validation logic in applications
🧯 If You Can't Patch
- Implement network segmentation to isolate systems using libbiosig
- Deploy application allowlisting to prevent unauthorized execution
🔍 How to Verify
Check if Vulnerable:
Check libbiosig version: 'biosig-tools --version' or examine library files. Verify if version is 3.9.0 or includes commit 35a819fa.Check Version:
biosig-tools --version 2>/dev/null || find /usr -name '*biosig*' -exec strings {} \; | grep -i versionVerify Fix Applied:
After patching, verify version is updated beyond 3.9.0 and commit 35a819fa. Test with known safe MFER files.📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing MFER files
- Unusual memory access patterns in application logs
- Failed MFER parsing attempts
Network Indicators:
- Unexpected MFER file transfers to vulnerable systems
- Outbound connections from libbiosig processes post-MFER processing
SIEM Query:
source="*biosig*" AND (event="crash" OR event="segfault") AND file_extension="mfer"