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PDW File Browser 1.3 Cross Site Scripting

PDW File Browser 1.3 Cross Site Scripting
Posted Oct 26, 2020
Authored by Ramon Janssen, Joost Vondeling, David Bimmel

PDW File Browser versions 1.3 and below suffer from a cross site scripting vulnerability.

tags | exploit, xss
MD5 | 2efdfeb6553fce3fe82e657fe8e2a074

PDW File Browser 1.3 Cross Site Scripting

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# Exploit Title: PDW File Browser <= v1.3 - Cross-Site Scripting (XSS)
# Date: 24-10-2020
# Exploit Author: David Bimmel
# Researchers: David Bimmel, Joost Vondeling, Ramòn Janssen
# Vendor Homepage: n/a
# Software Link: https://github.com/GuidoNeele/PDW-File-Browser
# Version: <=1.3

The PDW File Browser is a plugin for the TinyMCE and CKEditor WYSIWYG editors. The PDW File Browser contains a stored and Reflected XSS vulnerability which results in code execution within the browser of an authenticated user. This vulnerability can be exploited when an authenticated user visits the crafted URL (i.e. when phished or when visiting a website containing the URL).

Stored XSS:
The stored XSS is a result of insufficient input sanitization within the 'rename' functionality within the PDW file browser.
Below I have provided an example request were the filename (FILE.txt) is replaced with an XSS payload (<svg onload=alert(document.cookies)>). The payload gets executed when any authenticated user navigates to the PDW File browser page.

POST /ckeditor/plugins/pdw_file_browser/actions.php
HTTP/1.1 Host: <HOSTNAME>
[…]
action=rename&new_filename=<svg+onload=alert(document.cookie
s)>&old_filename=script%253EFILE.txt&folder=%252Fmedia%252F&typ
e=file

Reflected XSS:
The Reflected XSS is a result of insufficient input sanitization of the 'path' parameter when fetching the file specifications (file_specs.php). Below I have provided an example URL. When using this URL the user navigates to an non-existing file (the XSS payload). This results in the execution of the payload.

https://<HOSTNAME>/ckeditor/plugins/pdw_file_browser/file_spe
cs.php?ajax=true&path=%3Csvg+onload=alert(document.cookies)%
3E&type=file



Happy Hacking :^)
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