CVE-2025-53518
📋 TL;DR
An integer overflow vulnerability in libbiosig's ABF file parser allows arbitrary code execution when processing malicious files. This affects systems using libbiosig 3.9.0 or the master branch commit 35a819fa for ABF file processing. Attackers can achieve remote code execution by tricking users or automated systems into opening specially crafted ABF 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 persistent backdoor installation.
Likely Case
Remote code execution in the context of the vulnerable application, allowing attackers to execute arbitrary commands, install malware, or pivot to other systems.
If Mitigated
Denial of service or application crash if exploit fails or is blocked by security controls.
🎯 Exploit Status
Exploitation requires the victim to process a malicious ABF file, which could be delivered via email, downloads, or automated systems. No authentication is needed to trigger the vulnerability once the file is processed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not yet released
Vendor Advisory: https://talosintelligence.com/vulnerability_reports/TALOS-2025-2231
Restart Required: Yes
Instructions:
1. Monitor the libbiosig project for security updates. 2. When patch is available, update to the fixed version. 3. Restart any applications using libbiosig.
🔧 Temporary Workarounds
Disable ABF file processing
allTemporarily disable ABF file parsing functionality in applications using libbiosig
Application-specific configuration required
File type restrictions
allBlock ABF files at network boundaries or in email systems
Configure firewalls/email filters to block .abf files
🧯 If You Can't Patch
- Implement strict file validation for ABF files before processing
- Run libbiosig applications with minimal privileges and in isolated environments
🔍 How to Verify
Check if Vulnerable:
Check libbiosig version: biosig-tools --version or check library version in dependent applicationsCheck Version:
biosig-tools --version 2>/dev/null || echo "Check application dependencies"Verify Fix Applied:
After patching, verify version is newer than 3.9.0 and not commit 35a819fa📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing ABF files
- Unexpected process spawning from libbiosig applications
- Memory allocation errors in system logs
Network Indicators:
- ABF file downloads from untrusted sources
- Unusual outbound connections from libbiosig processes
SIEM Query:
Process: (libbiosig OR biosig) AND (crash OR segfault OR "integer overflow")