Title:

WebAssist PowerCMS PHP - Multiple Web Vulnerabilities

Date:

2013-09-28

References:

http://www.vulnerability-lab.com/get_content.php?id=1098

VL-ID:

1098

Common Vulnerability Scoring System:

4

Introduction:

Design Extender is a Dreamweaver extension that, among other things, adds WebAssist`s proven CMS solution, PowerCMS, to any
Dreamweaver website so that you or your clients can manage your website content with blessed ease. Use Design Extender`s
user-friendly wizards to create new content areas directly in Dreamweaver. Then you can view, insert and edit your content
the good ol` fashioned way (from a browser) or directly within Dreamweaver! Yes, you heard that correctly! With Design
Extender`s CMS tools, you may add PowerCMS to any of your Dreamweaver sites without purchasing additional licenses. This
is an ideal extension for developers who frequently build content management systems for their clients!

(Copy of the Vendor Homepage: http://www.webassist.com/ )

Abstract:

The Vulnerability Laboratory Research Team discovered multiple vulnerabilities in the official WebAssist PowerCMS PHP Web-Application.

Report-Timeline:

2013-09-28: Public Disclosure (Vulnerability Laboratory)

Status:

Published

Exploitation-Technique:

Remote

Severity:

Medium

Details:

1.1
A persistent input validation web vulnerability is detected in the official WebAssist PowerCMS PHP Web-Application.
The bug allows an attacker (remote) to implement/inject own malicious persistent script codes (application side).

The vulnerability is located in the `User Management` module when processing to request via POST method manipulated `first-
& lastname` parameters. Remote attackers can change the name of an user account to own script code to execute the malicious
context in the `Add/Edit` mode or main `User Management` listing.

Exploitation of the persistent web vulnerability requires low user interaction and a local low privileged web-application account.
Successful exploitation of the vulnerability can lead to persistent session hijacking (customers), account steal via persistent web
attacks, persistent phishing or persistent manipulation of module context.

Vulnerable Module(s):
[+] User Management - Add User

Vulnerable Parameter(s):
[+] Firstname
[+] Lastname

Affected Module(s):
[+] User Edit/Add Listing
[+] User Management Listing

2.1 - 2.2
Two client-side cross site scripting web vulnerabilities are detected in the official WebAssist PowerCMS PHP Web-Application.
The non-persistent cross site scripting web vulnerability allows an attacker to manipulate client side web application to browser requests.

The first cross site scripting vulnerability is located in the contents_results.php file when processing to request via GET method manipulated
s_Keyword search parameters. The malicious context gets executed on client-side of the application in the search results listing.

The secound cross site scripting web vulnerability is located in the load_content.php file when processing to request via GET method manipulated
contentTotal parameters. The malicious context gets executed on client-side of the application in the error id listing of the load_content.php file.

Exploitation of the vulnerability requires no privileged application user account but low or medium user interaction. Successful exploitation of
the vulnerability results in session hijacking, client-side phishing, client-side external redirects or malware loads and client-side mmanipulation
of the vulnerable module context.

Request Method(s):
[+] [GET]

Vulnerable Module(s):
[+] Search
[+] Module Context Listing

Vulnerable File(s):
[+] contents_results.php
[+] load_content.php

Vulnerable Parameter(s):
[+] s_Keyword
[+] contentTotal

Proof of Concept:

1.1
The persistent input validation web vulnerabilty can be exploited by remote attackers with low privileged application user account and
with low interaction. For demonstration or reproduce …

Review: POST - Add User

<div class="validation">
</div>
<form action="" id="user" name="user" method="post">
<label for="email">Email Address:</label>
<input name="email" id="email" value="[email protected]" class="validate['required','email']" type="text">

<label for="firstname">First Name:</label>
<input name="firstname" id="firstname" value=">\" <[PERSISTENT INJECTED SCRIPT CODE!])<"
type="text">\"<[PERSISTENT INJECTED SCRIPT CODE!])<"" class="validate['required']">

<label for="lastname">Last Name:</label>
<input name="lastname" type="text" id="lastname" value=">\"<[PERSISTENT INJECTED SCRIPT CODE!])<
> \"<[PERSISTENT INJECTED SCRIPT CODE!])<" class="validate['required']" />

Reference(s):
http://powercms.localhost:8080/admin_cms/user_insert.php

The client-side cross site scripting web vulnerabilties can be exploited by remote attackers without privileged application user account and
with low or medium user interaction. For demonstration or reproduce …

2.1

PoC:
http://powercms.localhost:8080/admin_cms/contents_results.php?S_Keyword=a&#37;2520&#37;3C&#37;2F&#37;3E&#37;3E&#37;22&#37;3Ciframe+src&#37;3Da+onload&#37;3Dalert&#37;28&#37;22BKM&#37;22&#37;29&#37;3C&amp;Search=Search

Review: Search Results

<h1>You searched "a%20>\"<[NON-PERSISTENT SCRIPT CODE EXECUTION!]BKM\")<"</h1">
<h2>Below are the results to your search.</h2>
<h2>Sorry no results matched your search.</h2>
</div></div><div id="footer"></a>
</div></div>
</body>
</html></iframe></h1>

2.2

PoC:
http://powercms.localhost:8080/admin_cms/common/load_content.php?ContentID=362&amp;contentTotal=a&#37;20&#37;3C/&#37;3E&#37;3E&#37;22&#37;3Ciframe&#37;20src=http://www.vulnerability-lab.com&#37;3E

Review: ContentTotal Error Exception ID

<div class="content-detail">
<img src="…/images/choose.png" class="shiftright" align="left">
<p class="sentence">Choose the content area you wish to edit below</p>
<span id="title"></span> <span id="num">(a >\"<[NON-PERSISTENT SCRIPT CODE EXECUTION!]"> editable region)</span>

Solution:

1.1
The persistent input validation vulnerability can be patched by a secure parse and encode of the name input fields of the users.
Ensure the users listing is also secure encoded to prevent execution out of the listing module context.

1.2
The first client-side cross site scripting vulnerability can be patched by a secure escape or encode of the contentTotal parameter in the load_content.php.

The secound client-side cross site scripting vulnerability can be patched by a secure escape or encode of the s_Keyword parameter in the content_results.php.

Risk:

1.1
The security risk of the persistent input validation web vulnerability in the user management is estimated as medium(+).

1.2
The security risk of the client-side cross site scripting web vulnerabilities are estimated as medium(-).

Credits:

Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri ([email protected]) [www.vulnerability-lab.com]

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