CVE-2025-54462
📋 TL;DR
A heap-based buffer overflow vulnerability in libbiosig's Nex file parser allows arbitrary code execution when processing malicious .nex files. This affects systems using libbiosig 3.9.0 or the master branch commit 35a819fa for parsing biological signal data. Attackers can achieve remote code execution by tricking users or automated systems into processing specially crafted 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 the same privileges as the libbiosig process, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Remote code execution on systems processing untrusted .nex files, allowing attackers to install malware, exfiltrate sensitive biological/medical data, or pivot to other systems.
If Mitigated
Denial of service or application crash if exploit fails or memory protections are in place, but no code execution.
🎯 Exploit Status
Exploitation requires the victim to process a malicious .nex file, which could be delivered via email attachments, compromised websites, or shared research data. No authentication is needed to trigger the vulnerability once the file is processed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for patched version
Vendor Advisory: https://biosig.sourceforge.io/
Restart Required: Yes
Instructions:
1. Monitor The Biosig Project website for security advisories
2. Update libbiosig to the latest patched version
3. Recompile and redeploy any applications using libbiosig
4. Restart services using the library
🔧 Temporary Workarounds
Disable Nex file processing
allConfigure applications to reject or skip .nex file parsing if not required
Application-specific configuration needed
Input validation and sandboxing
allImplement strict file validation and run libbiosig in a sandboxed environment
Use containerization (Docker) or virtual machines
Implement file type verification before processing
🧯 If You Can't Patch
- Implement network segmentation to isolate systems using libbiosig
- Deploy application allowlisting to prevent unauthorized execution of libbiosig processes
🔍 How to Verify
Check if Vulnerable:
Check libbiosig version: biosig-tools --version or examine library filesCheck Version:
biosig-tools --version 2>/dev/null || find /usr -name '*biosig*' -type f | xargs strings 2>/dev/null | grep -i versionVerify Fix Applied:
Verify updated version is installed and test with known safe .nex files📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults
- Unusual process spawning from libbiosig applications
- Failed file parsing attempts for .nex files
Network Indicators:
- Unexpected outbound connections from systems processing biological data
- File transfers of .nex files to untrusted sources
SIEM Query:
source="application_logs" AND (process="*biosig*" OR file_extension=".nex") AND (event="crash" OR event="segmentation_fault")