Document Title:
===============
Oracle Discoverer Viewer BI - Open Redirect Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1667

Oracle ID: S0666670


Release Date:
=============
2016-04-26


Vulnerability Laboratory ID (VL-ID):
====================================
1667


Common Vulnerability Scoring System:
====================================
2.8


Product & Service Introduction:
===============================
Discoverer is an intuitive ad-hoc query, reporting, analysis, and Web-publishing tool that empowers business users at all levels of the organization to gain 
immediate access to information from data marts, data warehouses, online transaction processing systems and Oracle E-Business Suite.. The latest release of 
Oracle Business Intelligence Discoverer 11g offers new functionality, including published Discoverer Webservice APIs, integration with Oracle WebCenter, 
integration with Oracle WebLogic Server, integration with Enterprise Manager (Fusion Middleware Control) and improved performance and scalability.

(Copy of the Vendor Homepage: http://www.oracle.com/technetwork/developer-tools/discoverer/overview/index.html )


Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered an open redirect web vulnerability in the official Oracle Discoverer Viewer Business Intelligence software.


Vulnerability Disclosure Timeline:
==================================
2016-01-18: Researcher Notification & Coordination (Tommy DeVoss)
2016-01-19: Vendor Notification (Oracle Corporation Security Team)
2016-01-20: Vendor Response/Feedback (Oracle Corporation Security Team)
2016-04-25: Vendor Fix/Patch (Oracle BI Developer Team)
2016-04-26: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Oracle
Product: Oracle Discoverer Viewer Business Intelligence - Software 2016 Q1


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


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


Technical Details & Description:
================================
An open redirect web vulnerability has been discovered in the official Oracle Discoverer Viewer for Business Intelligence software.
The bug allows remote attackers to execute external urls by the internal web-application requests via client-side.

The vulnerability is located in the `customUrl` parameter of the vulnerable `exit` module. The vulnerability allows an remote attacker 
to prepare client-side malicious urls to external sources. The request method to execute is GET and the vulnerability is located on 
the application-side of the software. The vulnerability is a classic open redirect web vulnerability.

The security risk of the open redirect web vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.0. 
Exploitation of the persistent input validation web vulnerability requires no privileged user account and low or medium user interaction. 
Successful exploitation of the vulnerability results in client-side redirects to malicious sources or client-side phishing.

Request Method(s):
        [+] GET

Vulnerable Module(s):
        [+] exit

Vulnerable Parameter(s):
        [+] customUrl


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

PoC:
127.0.0.1:8080/path/to/app/exit?event=exit&clientType=viewer&customUrl=http://[EVIL-URL-INPUT!].com


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure restriction of the `customUrl` parameter in the `exit` module of the software.
Disallow to request not whitelisted webpages in  the `customURL` value and include a tag filter to prevent as well.


Security Risk:
==============
The security risk of the open redirect web vulnerability in the Oracle Discoverer Viewer Business Intelligence software is estimated as low. (CVSS 2.8)


Credits & Authors:
==================
Tommy DeVoss - [http://www.vulnerability-lab.com/show.php?user=Tommy%20DeVoss]


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