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Sitecore Experience Platform 8.1 Update-3 Cross Site Scripting

Sitecore Experience Platform 8.1 Update-3 Cross Site Scripting
Posted Mar 15, 2017
Authored by Pralhad Chaskar

Sitecore Experience Platform version 8.1 Update-3 suffers from a cross site scripting vulnerability.

tags | exploit, xss
advisories | CVE-2016-8855
MD5 | 1c19a6c6d41b3ff7df01d183403b7fae

Sitecore Experience Platform 8.1 Update-3 Cross Site Scripting

Change Mirror Download
# Exploit Title: Stored Cross Site Scripting (XSS) in Sitecore Experience Platform 8.1 Update-3
# Date: March 15, 2017
# Exploit Author: Pralhad Chaskar
# Vendor Homepage: http://www.sitecore.net/en
# Version: 8.1 rev. 160519
# Tested on: Sitecore Experience Platform 8.1 Update-3 i.e.; 8.1 rev. 160519
# CVE : CVE-2016-8855

Vendor Description
------------------
Sitecore CMS makes it effortless to create content and experience rich websites that help you achieve your business goals such as increasing sales and search engine visibility, while being straight-forward to integrate and administer. Sitecore lets you deliver sites that are highly scalable, robust and secure. Whether you're focused on marketing, development and design, or providing site content, Sitecore delivers for you.

Description
------------
Cross-Site Scripting (XSS) attacks are a type of injection, in which malicious scripts are injected into otherwise benign and trusted web sites. XSS attacks occur when an attacker uses a web application to send malicious code, generally in the form of a browser side script, to a different end user.

Vulnerability Class
--------------------
Cross-site Scripting (XSS) - https://www.owasp.org/index.php/Cross-site_Scripting_(XSS)

Proof of Concept
----------------
Name and Description input fields aren't properly escaped. This could lead to an XSS attack that could possibly affect administrators,users,editor.

1. Login to application and navigate to "https://abc.com/sitecore/client/Applications/List Manager/Taskpages/Contact list"
2. Create new Contact List, add the XSS vector in Name and Description parameter using proxy (Burp) and Save the Contact List
3. Navigate Dashboard of List Manager on "https://abc.com/sitecore/shell/sitecore/client/Applications/List Manager/Dashboard" leading to execution of XSS payload.

Vendor Contact Timeline
------------------------
Discovered: October 16, 2016
Vendor Notification: October 18, 2016
Advisory Publication: Mar 15, 2017
Public Disclosure: Mar 15, 2017

Affected Targets
----------------
Sitecore Experience Platform 8.1 Update-3 i.e.; 8.1 rev. 160519

Solution
--------
Upgrade to Sitecore Experience Platform 8.2 Update-2 to fix this issue.

Credits
-------
Pralhad Chaskar
Information Security Analyst
Help AG Middle East

References
----------
[1] Help AG Middle East http://www.helpag.com/
[2] Sitecore Experience Platform https://dev.sitecore.net/Downloads/Sitecore_Experience_Platform.aspx

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