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             AUSCERT External Security Bulletin Redistribution

            Citrix XenServer Security Update for CVE-2016-5302
                               13 June 2016


        AusCERT Security Bulletin Summary

Product:           Citrix XenServer
Publisher:         Citrix
Operating System:  Xen
Impact/Access:     Administrator Compromise -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-5302  

Original Bulletin: 

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Citrix XenServer Security Update for CVE-2016-5302

Security Bulletin


Created: 09 Jun 2016

Modified: 09 Jun 2016

Description of Problem

A security vulnerability has been identified in XenServer 7.0 that may allow 
an attacker on the management network who is in possession of Active Directory
credentials for an AD account that is not authorised to manage a XenServer 
host to compromise that host.

The following vulnerability has been addressed:

    CVE-2016-5302 (Low): Incorrect host management AD authentication

Mitigating Factors

Only XenServer 7.0 deployments that have been upgraded from earlier releases 
are affected. Earlier releases are unaffected, nor are new deployments of 
XenServer 7.0.

Only deployments where Active Directory has been continuously enabled from 
before the upgrade to XenServer 7.0 are affected. If Active Directory was 
disabled at the time of upgrade or has been disabled since, even if only 
briefly, the deployment is unaffected.

To exploit the vulnerability, an attacker requires access to the management 
network of the host XenServer. Citrix recommends that the XenServer management
network is an isolated network.

What Customers Should Do

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

Citrix XenServer 7.0: CTX213769 https://support.citrix.com/article/CTX213769

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

Applicable Products

    XenServer 7.0

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