Citrix XenServer: Multiple vulnerabilities

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2012.0849
                Citrix XenServer Multiple Security Updates
                             7 September 2012

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

Product:           Citrix XenServer
Publisher:         Citrix
Operating System:  Windows
Impact/Access:     Denial of Service    -- Existing Account
                   Increased Privileges -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2012-4606 CVE-2012-3516 CVE-2012-3515
                   CVE-2012-3498 CVE-2012-3496 CVE-2012-3495
                   CVE-2012-3494 CVE-2012-3433 CVE-2012-3432

Reference:         ESB-2012.0842
                   ESB-2012.0787

Original Bulletin: 
   http://support.citrix.com/article/CTX134708

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Citrix XenServer Multiple Security Updates
Document ID: CTX134708  /  Created On: 05-Sep-2012  /  Updated On: 05-Sep-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 6.0.2.

The following denial of service and guest-to-host privilege escalation 
vulnerabilities have been addressed:

   hypercall physdev_get_free_pirq vulnerability (CVE-2012-3495)

   PHYSDEVOP_map_pirq index vulnerability (CVE-2012-3498)

   Qemu VT100 emulation vulnerability (CVE-2012-3515)

   Grant table entry swaps have inadequate bounds checking (CVE-2012-3516)

   HVM guest user mode MMIO emulation DoS vulnerability (CVE-2012-3432)

   HVM guest destroy p2m teardown host DoS vulnerability (CVE-2012-3433)

   hypercall set_debugreg vulnerability (CVE-2012-3494)

   XENMEM_populate_physmap DoS vulnerability (CVE-2012-3496)

   PV guest console vulnerability (CVE-2012-4606)

What Customers Should Do

Hotfixes have been released to address these issues in all supported versions 
and update levels of Citrix XenServer. Citrix strongly recommends that 
customers using Citrix XenServer identify and apply the hotfixes that relate 
to their deployed versions:

Citrix XenServer 6.0.2:
http://support.citrix.com/article/ctx134753


Citrix XenServer 6.0.0:
http://support.citrix.com/article/ctx134752


Citrix XenServer 5.6 Service Pack 2:
http://support.citrix.com/article/ctx134751


Citrix XenServer 5.6 Feature Pack 1:
http://support.citrix.com/article/ctx134750


Citrix XenServer 5.6:
http://support.citrix.com/article/ctx134748


Citrix XenServer 5.5 Update 2:
http://support.citrix.com/article/ctx134747


Citrix XenServer 5.0 Update 3:
http://support.citrix.com/article/ctx134746


Customers using Citrix XenServer 5.6 in the Common Criteria evaluated 
configuration should apply the following hotfix:
http://support.citrix.com/article/ctx134749

Acknowledgements

Citrix thanks James Forshaw of Context IS (www.contextis.com) for working with 
us to protect Citrix customers.

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 5.6
    XenServer 5.6 FP 1
    XenServer 5.6 SP 2
    XenServer 6.0
    XenServer 6.0.2

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