A stack-based buffer overflow vulnerability exists in the MFER parsing functionality of The Biosig Project libbiosig 3.9.0 and Master Branch (35a819fa...
Description
A stack-based buffer overflow vulnerability exists in the MFER parsing functionality of The Biosig Project libbiosig 3.9.0 and Master Branch (35a819fa). A specially crafted MFER file can lead to arbit...
AI Analyst Comment
Remediation
Update A Multiple Products to the latest version. Check vendor security advisory for specific patch details. Monitor for exploitation attempts and review access logs.
Description Summary:
A stack-based buffer overflow in the MFER parsing functionality of libbiosig allows unauthenticated remote attackers to achieve arbitrary code execution via a specially crafted MFER file.
Executive Summary:
A critical stack-based buffer overflow in libbiosig allows unauthenticated attackers to achieve arbitrary code execution by supplying a malicious MFER file.
Vulnerability Details
CVE-ID: CVE-2025-54484
Affected Software: The Biosig Project libbiosig
Affected Versions: 3.9.0, Master Branch (35a819fa)
Vulnerability: This is a stack-based buffer overflow occurring within the MFER parsing logic of biosig.c, specifically at line 8779. The vulnerability is triggered when an unauthenticated attacker provides a malformed MFER file containing a specific tag length, leading to memory corruption.
Business Impact
The ability for an unauthenticated attacker to execute arbitrary code poses a catastrophic risk to the integrity and availability of any system utilizing libbiosig. Given the CVSS score of 9.8, this vulnerability allows for total system compromise, potentially leading to unauthorized data access, lateral movement within the network, or complete service disruption.
Remediation Plan
Immediate Action: Users should update libbiosig to a version where this buffer overflow has been remediated; if no official release is available, ensure that untrusted MFER files are not processed by the library.
Proactive Monitoring: Security teams should monitor system logs for unusual crash patterns or unexpected behavior in applications that parse MFER data, which may indicate attempted exploitation.
Compensating Controls: Implement strict input validation or sandboxing for any service that parses external MFER files to prevent the delivery of malicious payloads to the vulnerable parsing function.
Exploitation Status
Public Exploit Available: Yes, a technical write-up detailing the vulnerability and trigger mechanism exists at Talos Intelligence.
Analyst Notes: As of Aug 25, 2025, there is no public information indicating active exploitation in the wild. The flaw is inherently exploitable because it involves a memory corruption primitive that does not require authentication or user interaction to trigger.
Analyst Recommendation
Due to the critical nature of this vulnerability and the potential for remote code execution, immediate attention is required. Administrators should verify their software inventory for the affected versions of libbiosig and apply the necessary patches or security updates as soon as they are provided by the vendor to eliminate the risk of exploitation.