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             AUSCERT External Security Bulletin Redistribution

            Citrix XenServer Security Update for CVE-2017-15597
                              25 October 2017


        AusCERT Security Bulletin Summary

Product:           Citrix XenServer
Publisher:         Citrix
Operating System:  Citrix XenServer
Impact/Access:     Increased Privileges     -- Existing Account
                   Denial of Service        -- Existing Account
                   Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-15597  

Original Bulletin: 

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Citrix XenServer Security Update for CVE-2017-15597

Security Bulletin 

Created: 24 Oct 2017
Modified: 24 Oct 2017

Applicable Products

XenServer 7.2
XenServer 7.1 LTSR Cumulative Update 1
XenServer 7.1
XenServer 7.0
XenServer 6.5

Description of Problem

A security vulnerability has been identified in Citrix XenServer that
may allow a malicious administrator of a guest VM to compromise the host.
This vulnerability affects all currently supported versions of
Citrix XenServer up to and including Citrix XenServer 7.2.
The following vulnerability has been addressed:
CVE-2017-15597: pin count / page reference race in grant table

What Customers Should Do

Hotfixes have been released to address these issues.  Citrix strongly
recommends that affected customers install these hotfixes as soon as
possible. The hotfixes can be downloaded from the following locations:

Citrix XenServer 7.2: CTX229067 - https://support.citrix.com/article/CTX229067

Citrix XenServer 7.1 LTSR CU1: CTX229066 - https://support.citrix.com/article/CTX229066

Citrix XenServer 7.1 LTSR: CTX229065 - https://support.citrix.com/article/CTX229065

Citrix XenServer 7.0: CTX229064 - https://support.citrix.com/article/CTX229064

Citrix XenServer 6.5 SP1: CTX229063 - https://support.citrix.com/article/CTX229063

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 

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 

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
24th October 2017	Initial Publishing

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