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AUSCERT External Security Bulletin Redistribution
ESB-2016.1476
Citrix XenServer Security Update for CVE-2016-5302
13 June 2016
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AusCERT Security Bulletin Summary
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Product: Citrix XenServer
Publisher: Citrix
Operating System: Xen
Impact/Access: Administrator Compromise -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2016-5302
Original Bulletin:
http://support.citrix.com/article/CTX213549
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Citrix XenServer Security Update for CVE-2016-5302
Security Bulletin
Low
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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