The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
None
PR
The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction
None
UI
The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
None
C
There is no impact on the confidentiality of the system; the attacker does not gain the ability to read any data.
Integrity
Low
I
Modification of data is possible, but the attacker does not have control over what can be modified, or the extent of what the attacker can affect is limited. The data modified does not have a direct, serious impact on the system.
Availability
None
A
There is no impact on the availability of the system; the attacker does not have the ability to disrupt access to or use of the system.
Oracle Discoverer Viewer BI Open RedirectDocument 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]
Disclaimer & Information:
=========================
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