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Q1What is this vulnerability? (Essence + Consequences)
🚨 **Essence**: A critical stack buffer overflow in `libbiosig`'s MFER parsing function. 💥 **Consequences**: Attackers can execute arbitrary code remotely, leading to total system compromise.
Q2Root Cause? (CWE/Flaw)
🛡️ **Root Cause**: **CWE-121** (Stack-based Buffer Overflow). The flaw lies in how the MFER format is parsed, failing to validate input boundaries properly.
Q3Who is affected? (Versions/Components)
📦 **Affected**: **libbiosig** (BioSig Project). Specifically, **version 3.9.0** is vulnerable. It is an open-source library for biomedical signal processing.
Q4What can hackers do? (Privileges/Data)
💀 **Impact**: Full Control! High CVSS score (9.8). Hackers gain **High** Confidentiality, Integrity, and Availability impact. They can run malicious code with the privileges of the application.
Q5Is exploitation threshold high? (Auth/Config)
⚡ **Threshold**: **LOW**. CVSS indicates **AV:N** (Network), **AC:L** (Low Complexity), **PR:N** (No Privileges), **UI:N** (No User Interaction). Easy to exploit remotely.
Q6Is there a public Exp? (PoC/Wild Exploitation)
🔍 **Exploit Status**: No public PoC listed in the data. However, the low complexity and network vector suggest potential for rapid wild exploitation by threat actors.
Q7How to self-check? (Features/Scanning)
🔎 **Self-Check**: Scan for **libbiosig v3.9.0**. Check if your application processes **MFER** files. Use SAST/DAST tools to detect stack overflow risks in C/C++ bio-signals libraries.
Q8Is it fixed officially? (Patch/Mitigation)
🛠️ **Fix**: Update to the latest patched version of **libbiosig**. The vendor (The Biosig Project) has issued this advisory. Check the Talos Intelligence report for specific patch details.
Q9What if no patch? (Workaround)
🚧 **No Patch?**: **Mitigation**: Disable MFER file parsing if not needed. Implement strict input validation or sandboxing for any component using this library. Isolate the service.