AEF CMS 1.0.9 Cross Site Scripting

2018-03-27T00:00:00
ID PACKETSTORM:146917
Type packetstorm
Reporter Benjamin Kunz Mejri
Modified 2018-03-27T00:00:00

Description

                                        
                                            `Document Title:  
===============  
AEF CMS v1.0.9 - (PM) Persistent Cross Site Scripting Vulnerability  
  
  
References (Source):  
====================  
https://www.vulnerability-lab.com/get_content.php?id=2123  
  
  
  
Release Date:  
=============  
2018-02-18  
  
  
Vulnerability Laboratory ID (VL-ID):  
====================================  
2123  
  
  
Common Vulnerability Scoring System:  
====================================  
4.4  
  
  
Vulnerability Class:  
====================  
Cross Site Scripting - Persistent  
  
  
Current Estimated Price:  
========================  
1.000a! - 2.000a!  
  
  
Product & Service Introduction:  
===============================  
AEFs full name is Advanced Electron Forum. This bulletin board software is free software. It is written   
in PHP and MySQL. AEF has a very simple and easy to use Administration Panel and installing this software   
is a piece of cake! You can install new themes, customize themes the way you want. The User Control Panel   
has a simple yet beautiful interface where users can set their preferences for the board. This Bulletin   
board or forum software has all the general features that a forum software should have.  
  
(Copy of the Homepage: https://www.softaculous.com/apps/forums/AEF & http://www.anelectron.com/)  
  
  
Abstract Advisory Information:  
==============================  
The vulnerability laboratory core research team discovered a persistent web vulnerability in the official Advanced Electron Forum v1.0.9 CMS.  
  
  
Vulnerability Disclosure Timeline:  
==================================  
2018-02-20: Public Disclosure (Vulnerability Laboratory)  
  
  
  
Discovery Status:  
=================  
Published  
  
  
Affected Product(s):  
====================  
  
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:  
================================  
A persistent cross site scripting vulnerability has been discovered in the official Advanced Electron Forums v1.0.9 Content Management System.  
The vulnerability allows remote attackers to inject own malicious script code with persistent attack vector to the application-side of the service.  
  
The persistent cross site vulnerability is located in the `FTP Link` element of the `Private Message` module. The editor of the private message   
module allows to insert links without sanitizing the content. Thus allows remote attackers to inject malicious script code payloads as private   
message to compromise user credentials or to persistent manipulate the affected modules context. The injection point is the editor ftp link   
element and the execution point occurs in the message body context on arrival. The request method to inject is post with restricted user   
privileges and the attack vector is located on the application-side.  
  
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 Module(s):  
[+] Private Messages  
  
Vulnerable Input(s):  
[+] Ftp Link (Editor Element)  
  
  
Proof of Concept (PoC):  
=======================  
The cross site scripting web vulnerability can be exploited by low privileged user accounts with low user interaction.  
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.  
  
  
Manual steps to reproduce the vulnerability ...  
1. Open the web-application and login as user  
2. Move to the private message module  
3. Open up the editor by composing a message  
4. add some short text, save the entry as draft  
5. Open the draft and insert a ftp link with a script code payload  
6. Save the entry and deliver the message to another test user  
Note: The message only needs to be watched to execute on arrival  
7. The test user opens the private message module and the persistent script code executes in the message body context  
8. Successful reproduce of the persistent vulnerability!  
  
  
PoC: Payload (Ftplink)  
%0D%0A%0D%0A or %0D%0A%0D%0A%0D%0A%0D%0A+  
  
  
PoC: Vulnerable Source  
<textarea name="pmbody" rows="13" cols="65" id="pmbody" onchange="storeCaret(this);" onkeyup="storeCaret(this);"   
onclick="storeCaret(this);" onselect="storeCaret(this);" style="visibility: visible; width: 487px;   
height: 226px;">This+is+a+private+test+message+with+payload+in+the+ftp+link%0D%0A%0D%0A</textarea>  
  
  
PoC: Session Logs (Send Private Message)  
Status: 200[OK]  
POST https://aeforums.localhost:8000/AEF/index.php?act=usercp&ucpact=sendsaved&pmid=1   
Mime Type[text/html]  
Request Header:  
Host[aeforums.localhost:8000]  
User-Agent[Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0]  
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]  
Content-Type[application/x-www-form-urlencoded]  
Content-Length[174]  
Referer[https://aeforums.localhost:8000/AEF/index.php?act=usercp&ucpact=sendsaved&pmid=1]  
Cookie[AEFCookies1526[aefsid]=jmik0sqtslneqffjl537i931brqh3tzr; AEFCookies8381[aefsid]=x1m0rs9lhcl6hl3tbq7qbdh9jn0xsnsf]  
Connection[keep-alive]  
Upgrade-Insecure-Requests[1]  
POST-Daten:  
pmrecipients[admin]  
pmsubject[test]  
pmbody[This+is+a+private+test+message+with+payload+in+the+ftp+link%0D%0A%0D%0A]  
postcode[yerudyyk4joz8ea5]  
pmsaveinsentitems[on]  
sendpm[Send+PM]  
Response Header:  
Server[Apache]  
X-Powered-By[PHP/5.4.45]  
Content-Length[217]  
Content-Type[text/html; charset=ISO-8859-1]  
-  
Status: 200[OK]  
GET https://aeforums.localhost:8000/AEF/evil.source   
Mime Type[text/html]  
Request Header:  
Host[aeforums.localhost:8000]  
User-Agent[Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0]  
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]  
Referer[https://aeforums.localhost:8000/AEF/index.php?act=usercp&ucpact=sendsaved&pmid=1]  
Cookie[AEFCookies1526[aefsid]=jmik0sqtslneqffjl537i931brqh3tzr; AEFCookies8381[aefsid]=x1m0rs9lhcl6hl3tbq7qbdh9jn0xsnsf]  
Connection[keep-alive]  
Upgrade-Insecure-Requests[1]  
Response Header:  
Server[Apache]  
Accept-Ranges[bytes]  
Content-Length[431]  
Content-Type[text/html; charset=UTF-8]  
  
  
Reference(s):  
https://aeforums.localhost:8000/AEF/  
https://aeforums.localhost:8000/AEF/index.php  
  
  
Solution - Fix & Patch:  
=======================  
The security vulnerability can be patched by a sanitize of the ftp link element input field in the private message module.  
Parse in the editor the output location for the link to prevent the execution point of the issue.   
  
  
Security Risk:  
==============  
The security risk of the persistent cross site scripting web vulnerability in the open-source web-application is estimated as medium (cvss 4.4).  
  
  
Credits & Authors:  
==================  
Benjamin K.M. [research@vulnerability-lab.com] - https://www.vulnerability-lab.com/show.php?user=Benjamin+K.M.  
  
  
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=========================  
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`