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             AUSCERT External Security Bulletin Redistribution

                Citrix Security Advisory for CVE-2015-3456
                                21 May 2015


        AusCERT Security Bulletin Summary

Product:           Citrix XenServer
Publisher:         Citrix
Operating System:  Citrix XenServer
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-3456  

Reference:         ASB-2015.0051

Original Bulletin: 

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Citrix Security Advisory for CVE-2015-3456

CTX201078 Created on May 13, 2015 Updated on May 20, 2015

Security Bulletin Severity : High

Description of Problem

Citrix is aware of the recent vulnerability that has been reported against the
Xen hypervisor. This issue is known as the 'VENOM' vulnerability and has been
assigned the following CVE number:

CVE-2015-3456: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3456

Citrix is actively analysing the impact of this vulnerability on affected 
products. Additional details and product-specific guidance can be found in the
following sections of this document.

Impacted Citrix Products

Citrix XenServer

All supported versions of Citrix XenServer are impacted by this issue.

Hotfixes have been released to address this issue. Citrix strongly recommends
that affected customers install the relevant hotfixes as soon as possible. 
These hotfixes are available on the Citrix website at the following locations:

Citrix XenServer 6.5 SP1: CTX142483 - 

Citrix XenServer 6.5: CTX142482 - https://support.citrix.com/article/CTX142482

Citrix XenServer 6.2 SP1: CTX142481 - 

Citrix XenServer 6.1: CTX142480 - https://support.citrix.com/article/CTX142480

Citrix XenServer 6.0.2: CTX142478 - 

Customers using Citrix XenServer 6.0.2 in the Common Criteria evaluated 
configuration should apply the following hotfix: CTX142479 - 

Citrix XenServer 6.0.0: CTX142477 - 

Citrix NetScaler Service Delivery Appliance

Citrix is actively investigating the potential impact of this issue on Citrix
NetScaler Service Delivery Appliances. In order to exploit this issue, a 
malicious user would require administrative access within a virtual appliance.
In deployments where the virtual appliances and their administrators are 
trusted, this issue would not present a risk.

Further information and mitigation guidance will be added to this document as
soon as it is available.

Citrix XenClient Enterprise

Citrix XenClient Enterprise is not believed to be affected by this issue.

Citrix Desktop Player for Mac

Citrix Desktop Player for Mac is not believed to be affected by this issue.

What Customers Should Do

Citrix is actively analysing the impact of this vulnerability and any required
remediation steps will be added to this document as soon as they are 

Citrix recommends that customers monitor this document for any updates. 
Customers can register for security bulletin alerts at the following address:

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

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


Date Change

May 13th 2015 Initial publication

May 18th 2015 Reformatting and addition of XenServer, NetScaler SDX and 
XenClient Enterprise sections

May 20th 2015 Update to XenServer and Desktop Player sections

Applicable Products

    XenServer 6.5

    XenServer 6.2.0

    XenServer 6.1.0

    XenServer 6.0.2

    XenServer 6.0

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