CVE-2025-53853
📋 TL;DR
A heap-based buffer overflow vulnerability in libbiosig's ISHNE parsing allows arbitrary code execution when processing malicious ECG annotation files. This affects systems using libbiosig 3.9.0 or the master branch commit 35a819fa for medical data processing. Attackers can achieve remote code execution by providing 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 complete control over the affected system, potentially leading to data theft, ransomware deployment, or lateral movement within medical networks.
Likely Case
Remote code execution on systems processing untrusted ISHNE files, allowing attackers to install malware, exfiltrate sensitive medical data, or disrupt medical device operations.
If Mitigated
Limited impact through proper input validation and file processing restrictions, potentially causing only denial of service or application crashes.
🎯 Exploit Status
Exploitation requires only a malicious file to be processed. No authentication or special privileges needed. The vulnerability is in file parsing code.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not yet released
Vendor Advisory: https://talosintelligence.com/vulnerability_reports/TALOS-2025-2232
Restart Required: Yes
Instructions:
1. Monitor The Biosig Project for security updates. 2. Apply patch when available. 3. Rebuild and redeploy applications using libbiosig. 4. Restart affected services.
🔧 Temporary Workarounds
Input Validation and File Restrictions
allImplement strict file validation and only allow trusted ISHNE files. Use file type verification before processing.
# Implement in application code: validate file signatures, size limits, and source
Sandbox File Processing
linuxRun libbiosig file parsing in isolated containers or sandboxes with minimal privileges.
docker run --read-only --cap-drop=ALL -v /trusted/files:/input:ro your_app
🧯 If You Can't Patch
- Implement network segmentation to isolate systems using libbiosig from critical networks
- Deploy application allowlisting to prevent execution of unauthorized binaries
🔍 How to Verify
Check if Vulnerable:
Check libbiosig version: biosig-tools --version or examine library files. Version 3.9.0 or master branch commit 35a819fa indicates vulnerability.Check Version:
biosig-tools --version 2>/dev/null || strings /usr/lib*/libbiosig* | grep -i versionVerify Fix Applied:
After patching, verify version is newer than 3.9.0 and not commit 35a819fa. Test with known safe ISHNE files.📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing ISHNE files
- Unusual process spawning from libbiosig applications
- Large memory allocation failures
Network Indicators:
- Unexpected file transfers to/from medical data processing systems
- Network connections from libbiosig processes to unknown destinations
SIEM Query:
process_name:"biosig" AND (event_type:crash OR memory_usage:>threshold)