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             AUSCERT External Security Bulletin Redistribution

                          ESB-2008.1009 -- [Win]
  Vulnerability in Citrix Web Interface 5.0 for Java Application Servers
     could result in failure to terminate Web Interface user sessions
                              29 October 2008

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              Citrix Web Interface 5.0
Publisher:            Citrix
Operating System:     Windows
Impact:               Inappropriate Access
Access:               Existing Account

Original Bulletin:    http://support.citrix.com/article/CTX118768

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Vulnerability in Citrix Web Interface 5.0 for Java Application Servers could 
result in failure to terminate Web Interface user sessions

Document ID: CTX118768 / Created On: Oct 24, 2008 / Updated On: Oct 24, 2008
Average Rating: not yet rated


Severity: Medium

Description of Problem

A vulnerability has been identified in Citrix Web Interface 5.0 for Java 
Application Servers that could result in the disconnection process failing to 
correctly terminate a users Web Interface session. This could potentially 
allow other authenticated users to gain unauthorized access to the existing 
Web Interface session using the same browser instance.

This vulnerability only affects Web Interface versions 5.0 and 5.0.1 when 
deployed with a Java application server. Older versions of Web Interface for 
Java Application Servers and all versions of Web Interface for Microsoft 
Internet Information Services are not affected by this issue.

Mitigating Factors

       This vulnerability can only be exploited by an attacker with access to 
       the same browser instance as the authorized user

       In order to exploit this vulnerability, an attacker would require valid
       credentials for the target Web Interface site

What Customers Should Do

This vulnerability has been addressed in Citrix Web Interface 5.0.2 for Java 
Application Servers. Citrix recommends that customers upgrade to this version. 
This upgrade can be obtained from the product downloads section of the Citrix 
Web site (My Citrix account required) at 
https://www.citrix.com/site/SS/downloads/.

What Citrix Is Doing

Citrix is notifying customers and channel partners about this potential 
security issue. This article is also available from the Citrix Knowledge Center 
at http://support.citrix.com/.

Obtaining Support on This Issue

If you require technical assistance with this issue, please contact Citrix 
Technical Support. Contact details for Citrix Technical Support are available 
at http://www.citrix.com/site/ss/supportContacts.asp.

Reporting Security Vulnerabilities to Citrix

Citrix welcomes input regarding the security of its products and considers any 
and all potential vulnerabilities seriously. If you would like to report a 
security issue to Citrix, please compose an e-mail to secure@citrix.com stating 
the exact version of the product in which the vulnerability was found and the
steps needed to reproduce the vulnerability.

This document applies to:

    * Web Interface 5.0

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

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