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             AUSCERT External Security Bulletin Redistribution

                Citrix XenServer Multiple Security Updates
                              23 October 2013


        AusCERT Security Bulletin Summary

Product:           Citrix XenServer
Publisher:         Citrix
Operating System:  Citrix XenServer
Impact/Access:     Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2013-4368 CVE-2013-4361 CVE-2013-4355

Reference:         ESB-2013.1440

Original Bulletin: 

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Citrix XenServer Multiple Security Updates

Document ID: CTX139295

Created On: Oct 21, 2013

Updated On: Oct 21, 2013

Average Rating: 5 (1 ratings)

View products this document applies to link to products this document applies 

Severity: Low

Description of Problem

A number of security vulnerabilities have been identified in Citrix XenServer. 
These vulnerabilities affect all currently supported versions of Citrix 
XenServer up to and including version 6.2.

The following vulnerabilities have been addressed:

    - CVE-2013-4355: Information leaks through I/O instruction emulation

    - CVE-2013-4361: Information leak through fbld instruction emulation

    - CVE-2013-4368: Information leak through outs instruction emulation

Mitigating Factors

The information leaks can only be attempted by administrators of guest VMs, or 
by users that have been specifically assigned memory-mapped I/O access.

The information leaked consists of a few bytes at a location outside the 
attacker's control.

What Customers Should Do

Hotfixes have been released to address this issue. Citrix recommends that 
affected customers install the relevant hotfix, which can be downloaded from 
the following locations:

Citrix XenServer 6.2: CTX139308 - Hotfix XS62E009 - For XenServer 6.2.0

Citrix XenServer 6.1: CTX139307 - Hotfix XS61E033 - For XenServer 6.1.0

Citrix XenServer 6.0.2: CTX139305 - Hotfix XS602E029 - For XenServer 6.0.2

Customers using Citrix XenServer 6.0.2 in the Common Criteria evaluated 
configuration should apply the following hotfix: CTX139306 - Hotfix 
XS602ECC007 - For XenServer 6.0.2 Common Criteria

Citrix XenServer 6.0.0: CTX139304 - Hotfix XS60E035 - For XenServer 6.0

Citrix XenServer 5.6 Service Pack 2: CTX139303 - Hotfix XS56ESP2033 - For 
XenServer 5.6 Service Pack 2

Citrix XenServer 5.6 Feature Pack 1: CTX139302 - Hotfix XS56EFP1021 - For 
XenServer 5.6 Feature Pack 1

Citrix XenServer 5.6: CTX139300 - Hotfix XS56E022 - For XenServer 5.6

Customers using Citrix XenServer 5.6 in the Common Criteria evaluated 
configuration should apply the following hotfix: CTX139301 - Hotfix 
XS56ECC010 - For XenServer 5.6 Common Criteria

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:

    XenServer 5.6
    XenServer 5.6 Common Criteria
    XenServer 5.6 FP 1
    XenServer 5.6 SP 2
    XenServer 6.0
    XenServer 6.0.2
    XenServer 6.0.2 Common Criteria
    XenServer 6.1.0
    XenServer 6.2.0

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