'[FD] AEF CMS v1.0.9 - (PM) Persistent Cross Site Scripting Vulnerability'

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List:       full-disclosure
Subject:    [FD] AEF CMS v1.0.9 - (PM) Persistent Cross Site Scripting Vulnerability
From:       Vulnerability Lab <research () vulnerability-lab ! com>
Date:       2018-03-27 12:48:56
Message-ID: 28c1c584-3eaf-be87-dc70-dfd4a788dec5 () vulnerability-lab ! com
[Download RAW message or body]

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:
========================
1.000ā‚¬ - 2.000ā‚¬

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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