AusCERT - ESB-2013.0571 - [UNIX/Linux] Citrix XenServer: Denial of service

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ESB-2013.0571 - [UNIX/Linux] Citrix XenServer: Denial of service - Existing account
Date: 23 April 2013
References: ESB-2013.0557

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2013.0571
                     Citrix XenServer Security Update
                               23 April 2013

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

Product:           Citrix XenServer
Publisher:         Citrix Systems
Operating System:  UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2013-1917  

Reference:         ESB-2013.0557

Original Bulletin: 
   http://support.citrix.com/article/CTX137478

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Citrix XenServer Security Update

Document ID: CTX137478

Created On: Apr 18, 2013

Updated On: Apr 18, 2013

Severity: Low

Description of Problem

A security vulnerability has been identified in Citrix XenServer. This 
vulnerability allows an unprivileged user of a guest VM to crash the host.

The vulnerability is identified as:

    * CVE-2013-1917: Xen PV DoS vulnerability with SYSENTER

Mitigating Factors

The vulnerability can only be exploited from PV guest VMs running on Intel 
CPUs.

What Customers Should Do

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

Citrix XenServer 6.1:
CTX137487 - Hotfix XS61E019 - For XenServer 6.1.0

Citrix XenServer 6.0.2:
CTX137486 - Hotfix XS602E022 - For XenServer 6.0.2

Citrix XenServer 6.0.0:
CTX137484 - Hotfix XS60E028 - For XenServer 6.0

Citrix XenServer 5.6 Service Pack 2:
CTX137483 - Hotfix XS56ESP2027 - For XenServer 5.6 Service Pack 2

Citrix XenServer 5.6 Feature Pack 1:
CTX137482 - Hotfix XS56EFP1017 - For XenServer 5.6 Feature Pack 1

Citrix XenServer 5.6:
CTX137481 - Hotfix XS56E018 - For XenServer 5.6

Citrix XenServer 5.5 Update 2:
CTX137480 - Hotfix XS55EU2016 - For XenServer 5.5 Update 2

Citrix XenServer 5.0 Update 3:
CTX137479 - Hotfix XS50EU3016 - For XenServer 5.0 Update 3

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 to Citrix

Citrix welcomes input regarding the security of its products and considers 
any and all potential vulnerabilities seriously. If you would like to report 
a security issue to Citrix, please compose an e-mail to secure@citrix.com 
stating the exact version of the product in which the vulnerability was found 
and the steps needed to reproduce the vulnerability.

This document applies to:

    XenServer 5.0
    XenServer 5.0 Update 3
    XenServer 5.5
    XenServer 5.6
    XenServer 5.6 FP 1
    XenServer 5.6 SP 2
    XenServer 6.0
    XenServer 6.0.2
    XenServer 6.1.0

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