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             AUSCERT External Security Bulletin Redistribution

                Citrix XenServer Multiple Security Updates
                              6 December 2012


        AusCERT Security Bulletin Summary

Product:           Citrix XenServer
Publisher:         Citrix
Operating System:  Windows
Impact/Access:     Increased Privileges     -- Existing Account
                   Denial of Service        -- Existing Account
                   Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2012-5515 CVE-2012-5514 CVE-2012-5513
                   CVE-2012-5512 CVE-2012-5511 CVE-2012-5510

Reference:         ESB-2012.1144

Original Bulletin: 

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Citrix XenServer Multiple Security Updates

Document ID: CTX135777     
Created On: Dec 4, 2012   
Updated On: Dec 4, 2012 

Severity: High

Description of Problem

A number of security vulnerabilities have been identified in Citrix XenServer. 
These vulnerabilities affect all currently supported versions of Citrix 

XenServer up to and including version 6.1.

The following vulnerabilities have been addressed:

     Grant table version switch list corruption vulnerability (CVE-2012-5510)

     Several HVM operations do not validate the range of their inputs 

     HVMOP_get_mem_access crash / HVMOP_set_mem_access information leak 

     XENMEM_exchange may overwrite hypervisor memory (CVE-2012-5513)

     Missing unlock in guest_physmap_mark_populate_on_demand() (CVE-2012-5514)

     Several memory hypercall operations allow invalid extent order values 

What Customers Should Do

Citrix is in the process of releasing hotfixes to address these issues in all 
supported versions and update levels of Citrix XenServer. These hotfixes, when 
available, may be downloaded from the locations below. Citrix strongly 
recommends that customers using Citrix XenServer identify and apply the 
hotfixes that relate to their deployed versions:

Citrix XenServer 6.1:
CTX135709 - Hotfix XS61E006 - For XenServer 6.1.0

Citrix XenServer 6.0.2:
CTX135707 - Hotfix XS602E016 - For XenServer 6.0.2

Citrix XenServer 6.0.2 CC:
Customers using Citrix XenServer 6.0.2 in the Common Criteria evaluated 
configuration should apply the following hotfix: CTX135708 - [Document Not 

Citrix XenServer 6.0.0:
CTX135706 - Hotfix XS60E024 - For XenServer 6.0

Citrix XenServer 5.6 Service Pack 2:
CTX135705 - Hotfix XS56ESP2022 - For XenServer 5.6 Service Pack 2

Citrix XenServer 5.6 Feature Pack 1:
CTX135704 - Hotfix XS56EFP1014 - For XenServer 5.6 Feature Pack 1

Citrix XenServer 5.6:
CTX135702 - Hotfix XS56E016 - For XenServer 5.6

Citrix XenServer 5.6 CC:
Customers using Citrix XenServer 5.6 in the Common Criteria evaluated 
configuration should apply the following hotfix: CTX135703 - [Document Not 

Citrix XenServer 5.5 Update 2:
CTX135701 - Hotfix XS55EU2014 - For XenServer 5.5 Update 2

Citrix XenServer 5.0 Update 3:
CTX135699 - Hotfix XS50EU3014 - For XenServer 5.0 Update 3

Customers using Citrix CloudPlatform, previously known as Citrix CloudStack, 
that use XenServer are recommended to apply the hotfix relevant to their 
version of XenServer.

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

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