Adobe (Edex) - CS Cross Site & Redirect Vulnerability

Document Title:
===============
Adobe (Edex) - CS Cross Site & Redirect Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1633

PSIRT ID: 4274

Video: https://www.youtube.com/watch?v=OHgnIQp0WU0


Release Date:
=============
2016-03-09


Vulnerability Laboratory ID (VL-ID):
====================================
1633


Common Vulnerability Scoring System:
====================================
3.4


Product & Service Introduction:
===============================
Whether it is a smartphone or tablet app, a game, a video, a digital magazine, a website, or an online experience,
chances are that it was touched by Adobe technology. Our tools and services enable our customers to create
groundbreaking digital content, deploy it across media and devices, and then continually measure and optimize it
based on user data. By providing complete solutions that combine digital media creation with data-driven marketing,
we help businesses improve their communications, strengthen their brands, and ultimately achieve greater business success.

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


Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered a client-side url redirect and cross site scripting web vulnerability in the official Adobe (Edex) web-application.


Vulnerability Disclosure Timeline:
==================================
2015-11-02: Researcher Notification & Coordination (Karim Rahal)
2015-11-03: Vendor Notification (Adobe PSIRT - Security Acknowledgements)
2015-11-09: Vendor Response/Feedback (Adobe PSIRT - Security Acknowledgements)
2015-03-01: Vendor Fix/Patch (Adobe - Developer Team)
2015-03-06: Security Reward (Adobe PSIRT - Security Acknowledgements)
2015-03-09: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Adobe Systems
Product: Edex - Online Service (Web-Application) 2015 Q4


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


Severity Level:
===============
Low


Technical Details & Description:
================================
Reflected XSS(non-persistent) is a vulnerability that allows an attacker to execute a Payload(script) inside a website via the URL. Reflected XSS is done 
because of Lack-of Filtering inside the Code which allows the attacker to execute his payload(script) into the page and he could execute malicious code 
then send it to victim and exploit it on the victim`s browser. The injection point of the bug is the redirect parameter value and the request method to 
inject is GET. The vulnerability is a classic client-side cross site scripting vulnerability with non-persistent attack vector. The vulnerability can be 
exploited by remote attackers without privilege web-application user accounts and with low or medium user interaction. Successful exploitation of the 
vulnerability results in session hijacking, non-persistent phishing, non-persistent external redirects, non-persistent load of malicious script codes or 
non-persistent web module context manipulation.

A client-side redirect is also detected in the redirect value of the auth mechanism in the edex adobe online service web-application. The vulnerability 
allows remote attacker to redirect client-side browser to application GET method requests. The vulnerability can be exploited by remote attackers without 
privilege web-application user accounts and with low or medium user interaction. Successful exploitation results in client side phishing and client-side 
external redirect to malicious sources.

Request Method(s):
				[+] GET

Vulnerable Service(s):
				[+] edex.adobe.com

Vulnerable Module(s):
				[+] ./main/auth/

Vulnerable Parameter(s):
				[+] redirect


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

PoC: Cross Site Scripting
https://edex.adobe.com/main/auth/?redirect="><svg/onload=alert('Karim-Waz-Here')>

PoC: Redirect
https://edex.adobe.com/main/auth/?redirect="http://www.vulnerability-lab.com/x


Reference(s):
https://edex.adobe.com/
https://edex.adobe.com/main/
https://edex.adobe.com/main/auth/


Solution - Fix & Patch:
=======================
Restrict the redirect parameter value to disallow unauthorized xternal redirects to malicious webpages.
Encode and parse the vulnerable redirect value in the auth mechanism to prevent client-side script code injection attacks.
Filter and restrict the input by disallowing the usage of special chars to provoke exceptions.


Security Risk:
==============
The security risk of the client-side cross site scripting web vulnerability and redirect issue are estimated as medium. (CVSS 3.4)


Credits & Authors:
==================
Karim Rahal [[email protected]] - @KarimMTV [http://www.vulnerability-lab.com/show.php?user=Karim%20Rahal]


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