CVE-2025-54481
📋 TL;DR
A 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 using 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 persistent backdoor installation.
Likely Case
Application crash leading to denial of service, with potential for code execution in vulnerable configurations.
If Mitigated
Application crash without code execution if exploit mitigations like ASLR/NX are effective.
🎯 Exploit Status
Exploitation requires only a malicious MFER file, making this easily weaponizable once PoC is available.
🛠️ 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 vendor advisory for patch release. 2. Update to patched version when available. 3. Restart affected applications.
🔧 Temporary Workarounds
Disable MFER file processing
allConfigure applications to reject or not process MFER files
Application-specific configuration required
Input validation
allImplement strict validation of MFER file inputs before processing
Implement custom validation logic in applications using libbiosig
🧯 If You Can't Patch
- Network segmentation to isolate systems using libbiosig
- Implement strict file upload controls and scanning for MFER files
🔍 How to Verify
Check if Vulnerable:
Check libbiosig version: if using 3.9.0 or master branch commit 35a819fa or earlier, system is vulnerable.Check Version:
Check libbiosig version through application dependencies or package managerVerify Fix Applied:
Verify updated to version after patch release, or check that commit 35a819fa is not present.📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing MFER files
- Unexpected process termination in libbiosig
Network Indicators:
- Inbound MFER file transfers to vulnerable systems
SIEM Query:
Process termination events for applications using libbiosig combined with file type detection for MFER