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             AUSCERT External Security Bulletin Redistribution

                Citrix XenServer Multiple Security Updates
                               18 July 2014


        AusCERT Security Bulletin Summary

Product:           Citrix XenServer
Publisher:         Citrix
Operating System:  Citrix XenServer
Impact/Access:     Denial of Service        -- Existing Account
                   Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2014-4948 CVE-2014-4947 CVE-2014-4021

Reference:         ESB-2014.1002.2

Original Bulletin: 

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Citrix XenServer Multiple Security Updates


Created On Jul 15, 2014

Updated On Jul 15, 2014

Severity: High

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 Citrix XenServer 6.2 Service Pack 1.

The following vulnerabilities have been addressed:

CVE-2014-4021: Citrix XenServer potential guest information leak through 
hypervisor page reuse

CVE-2014-4947: Buffer overflow in Citrix XenServer HVM graphics console 

CVE-2014-4948: Citrix XenServer guest denial of service and information leak 
through guest VHD modification

What Customers Should Do

Hotfixes have been released to address these issues. Citrix strongly 
recommends that affected customers install the relevant hotfixes, which can be
downloaded from the following locations:

Citrix XenServer 6.2 Service Pack 1: CTX141036 Hotfix XS62ESP1008 - For 
XenServer 6.2.0 Service Pack 1

Citrix XenServer 6.1: CTX141038 Hotfix XS61E041 - For XenServer 6.1.0 and 
CTX141044 Hotfix XS61E040 - For XenServer 6.1.0

Citrix XenServer 6.0.2: CTX141040 Hotfix XS602E035 - For XenServer 6.0.2

Customers using Citrix XenServer 6.0.2 in the Common Criteria evaluated 
configuration should apply the following hotfixes: CTX141039 Hotfix 
XS602ECC011 - For XenServer 6.0.2 Common Criteria and CTX141043 Hotfix 
XS602ECC010 - For XenServer 6.0.2 Common Criteria

Citrix XenServer 6.0.0: CTX141041 Hotfix XS60E039 - For XenServer 6.0 and 
CTX141042 Hotfix XS60E038 - For XenServer 6.0

These hotfixes also provide updates to the OpenSSL package in Dom0. These 
updates are not in response to any specific vulnerability but may reduce false
positive results from certain vulnerability scanners.

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. For guidance on how to report 
security-related issues to Citrix, please see the following document: 
CTX081743 Reporting Security Issues to Citrix

Applicable Products

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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