ESB-2017.3213 - [Appliance][Virtual] Citrix XenServer: Denial of service - Existing account 2017-12-18

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.3213
      Patch for host crash from guest in Citrix XenServer 7.2 and 7.1
                             18 December 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Citrix XenServer
Publisher:         Citrix
Operating System:  Network Appliance
                   Virtualisation
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade

Original Bulletin: 
   https://support.citrix.com/article/CTX230624

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CTX230624

Security Update for Citrix XenServer

Security Bulletin | Medium
| Created: 15 Dec 2017 | Modified: 15 Dec 2017

Applicable Products

  * XenServer 7.2
  * XenServer 7.1 LTSR Cumulative Update 1

Description of Problem

A security issue has been identified within Citrix XenServer that may allow the
malicious administrator of a guest VM to cause the host to crash.

This issue affects Citrix XenServer 7.2 and Citrix XenServer 7.1 LTSR CU1.

A CVE identifier is not presently available for this issue.

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What Customers Should Do

Hotfixes have been released to address these issues. Citrix recommends that
affected customers install these hotfixes as part of their normal patching
schedule. The hotfixes can be downloaded from the following locations:

Citrix XenServer 7.2: CTX230237 ? https://support.citrix.com/article/CTX230237 

Citrix XenServer 7.1 LTSR CU1: CTX230236 ? https://support.citrix.com/article/
CTX230236 

Customers using the LivePatching feature of Citrix XenServer 7.2 will not need
to reboot servers to apply this hotfix.  However, customers using Citrix
XenServer 7.1 LTSR CU1 will need to reboot servers for this hotfix to be
effective.

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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/.

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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  https://www.citrix.com/support/open-a-support-case.html. 

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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

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Changelog

+-----------------------------------------------------------------------------+
|Date                                  |Change                                |
|--------------------------------------+--------------------------------------|
|15th December 2017                    |Initial publishing                    |
+-----------------------------------------------------------------------------+

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