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[FD] ZMS v3.2 CMS - Multiple Client Side Cross Site Scripting Web Vulnerabilities

Document Title:
===============
ZMS v3.2 CMS - Multiple Client Side Cross Site Scripting Web Vulnerabilities


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1890


Release Date:
=============
2016-07-28


Vulnerability Laboratory ID (VL-ID):
====================================
1890


Common Vulnerability Scoring System:
====================================
3.3


Product & Service Introduction:
===============================
ZMS is the python content management solution (CMS) for website-based 
ePublishing. An easy Editorial interface 
and flexible content modeling (multilingualism, metadata, content objects, XML 
import / export, workflow 
etc.) aimed at optimum productivity for web pages, documentation and 
Educational content. ZMS is based 
on Zope, the leading open-source Web application server. ZOPE is 
platform-independent and runs on Linux, 
Unix, Solaris, Windows 9x / NT / 2000 / XP / Vista / 7 and Mac OS X.

(Copy of the Vendor Homepage: 
https://www.zms-publishing.com/content/download/index_ger.html )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered two client-side 
cross site scripting vulnerability in the official ZMS v3.2 python content 
management system.


Vulnerability Disclosure Timeline:
==================================
2016-07-28:     Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================

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


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


Technical Details & Description:
================================
Multiple client-side cross site scripting web vulnerabilities has been 
discovered iin the official ZMS v3.2 python content management system.
The cross site scripting web vulnerability allows remote attackers to inject 
own malicious script code to client-side browser to 
web-application requests.

The vulnerabilities are located in the `manage_tabs_message` parameter of the 
`manage_importexport` and `manage_main` files.
Remote attackers are able to inject own malicious script codes via GET method 
request to compromise user session data.
The attack vector is persistent and the request method to inject is GET. The 
message context of the status is not secure 
parsed by the python validation, thus results in the persistent execute of the 
script code payload.

The security risk of the vulnerability is estimated as medium with a cvss 
(common vulnerability scoring system) count of 3.3. 
Exploitation of the vulnerability requires no privileged user account or 
restricted access and only low user interaction. 
Successful exploitation of the vulnerabilities results in non-persistent 
phishing mails, session hijacking, non-persistent 
external redirect to malicious sources and application-side manipulation of 
affected or connected module context.

Vulnerable Module(s)
                                [+] manage_main
                                [+] manage_importexport

Vulnerable Parameter(s)
                                [+] manage_tabs_message

Affected Module(s)
                                [+] Status Message


Proof of Concept (PoC):
=======================
The client-side cross site vulnerabilities can be exploited by remote attackers 
without privileged user account and with low user interaction.
For security demonstration of the issue or to reproduce the vulnerability 
follow the provided information and steps below to continue.

PoC: Exploitation
http://zms.localhost:8080/manage_importexport?lang=ger&manage_tabs_message=%3Ciframe%20src=a%20onload=alert(document.cookie)%20%3C

PoC: Alert Status Message
<div class="alert alert-success">
        <a class="close" data-dismiss="alert" href="#">×</a>
        <iframe src="a" onload="alert(document.cookie)" <="" (27.07.16="" 
21:53:28)="" div="">


PoC: Exploitation
http://zms.localhost:8080/manage_main?lang=ger&manage_tabs_message=%3Ciframe%20src=a%20onload=alert(document.cookie)%20%3C


PoC: Alert Status Message
<div class="alert alert-success">
        <a class="close" data-dismiss="alert" href="#">×</a>
        <iframe src="a" onload="alert(document.cookie)" <="" (27.07.16="" 
22:02:21)="" div="">


Reference(s):
http://zms.localhost:8080/manage_main
http://zms.localhost:8080/manage_importexport


Solution - Fix & Patch:
=======================
The client-side cross site scripting web vulnerabilities can be patched by a 
secure parse of the manage_tabs_message parameter 
in the manage_main and manage_importexport files. Restrict the input and 
disallow the usage of special chars and filter the parameter.
Escape the context or entries and use an exception-handling to prevent further 
client-side script code injection attacks.


Security Risk:
==============
The security risk of the client-side cross site scripting web vulnerabilities 
in the zms web-application are estimated as medium. (CVSS 3.3)


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri 
(bkm@xxxxxxxxxxxxxxxxx) [www.vulnerability-lab.com]


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