CVE-2025-54483
📋 TL;DR
A critical stack-based buffer overflow vulnerability in libbiosig's MFER file parser allows arbitrary code execution when processing malicious MFER files. This affects applications using libbiosig 3.9.0 or the master branch for medical signal data processing. Attackers can achieve remote code execution by tricking users or systems into opening specially crafted MFER files.
💻 Affected Systems
- The Biosig Project libbiosig
📦 What is this software?
Libbiosig by Libbiosig Project
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining complete control over the affected system, potentially leading to data theft, ransomware deployment, or lateral movement within networks.
Likely Case
Remote code execution with the privileges of the application using libbiosig, enabling data exfiltration, backdoor installation, or further exploitation.
If Mitigated
Denial of service through application crash if exploit attempts fail or are blocked by security controls.
🎯 Exploit Status
Exploitation requires the victim to process a malicious MFER file, which could be delivered via email, web upload, or network share. The vulnerability is in a specific parsing function with clear trigger conditions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Monitor the Biosig Project repository for security updates. 2. Apply patches when available. 3. Recompile any applications using libbiosig with the patched version.
🔧 Temporary Workarounds
Disable MFER file processing
allConfigure applications to reject or skip MFER file parsing if this format is not required.
Application-specific configuration required
Input validation for MFER files
allImplement strict validation of MFER file headers and structure before passing to libbiosig.
Custom code implementation required
🧯 If You Can't Patch
- Implement network segmentation to isolate systems using libbiosig from untrusted networks.
- Deploy application allowlisting to prevent execution of unauthorized binaries that might exploit this vulnerability.
🔍 How to Verify
Check if Vulnerable:
Check libbiosig version: 'biosig_version' command or examine source code for commit hash 35a819fa or version 3.9.0.Check Version:
biosig_version 2>&1 | grep -i versionVerify Fix Applied:
Verify updated version does not contain the vulnerable code at biosig.c line 8759 in the MFER parsing section.📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing MFER files
- Unexpected process spawning from libbiosig applications
- Memory access violation errors
Network Indicators:
- Unusual outbound connections from systems using libbiosig
- MFER file transfers to vulnerable systems
SIEM Query:
Process: (libbiosig OR biosig) AND (EventID: 1000 OR Segmentation fault OR Access violation)