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             AUSCERT External Security Bulletin Redistribution

                               ESB-2023.4016
             CVE-2016-9603 - Citrix XenServer Security Update
                               18 July 2023

===========================================================================

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

Product:           Citrix XenServer
Publisher:         Citrix
Operating System:  Citrix XenServer
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-9603  

Original Bulletin: 
   https://support.citrix.com/article/CTX221578/cve20169603-citrix-xenserver-security-update

Comment: CVSS (Max):  9.9 CVE-2016-9603 (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H)
         CVSS Source: NVD
         Calculator:  https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

- --------------------------BEGIN INCLUDED TEXT--------------------

CVE-2016-9603 - Citrix XenServer Security Update

Reference: CTX221578
Category : Severity: High
Created  : 14 March 2017
Modified : 15 August 2019

Applicable Products

  o XenServer 7.1

Description of Problem

A security issue has been identified within Citrix XenServer. This issue could,
if exploited, allow the administrator of an HVM guest VM to compromise the
host.

The following vulnerability has been addressed:

  o CVE-2016-9603 (High): QEMU: Cirrus VGA Heap overflow via display refresh

Mitigating Factors

Customers using only PV guest VMs are not affected by this vulnerability.

Customers using only VMs that use the std-vga graphics emulation are not
affected by this vulnerability.

What Customers Should Do

Hotfixes have been released to address these issues. Citrix recommends that
affected customers install these hotfixes, which can be downloaded from the
following locations:

Citrix XenServer 7.1: CTX221590 - https://support.citrix.com/article/CTX221590

Citrix XenServer 7.0: CTX221571 - https://support.citrix.com/article/CTX221571

Citrix XenServer 6.5 SP1: CTX221716 - https://support.citrix.com/article/
CTX221716

Citrix XenServer 6.2 SP1: CTX221569 - https://support.citrix.com/article/
CTX221569

Citrix XenServer 6.0.2 Common Criteria: CTX221568- https://support.citrix.com/
article/CTX221568

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

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

Changelog

+-----------------------------------+-----------------------------------------+
|Date                               |Change                                   |
+-----------------------------------+-----------------------------------------+
|14th March 2017                    |Initial publishing                       |
+-----------------------------------+-----------------------------------------+

- --------------------------END INCLUDED TEXT--------------------

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