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ESB-2014.2301 - [Virtual] Citrix XenServer: Multiple vulnerabilities

Date: 05 December 2014
References: ESB-2014.0108  ESB-2014.2193  ESB-2014.2258  ESB-2015.0186  

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             AUSCERT External Security Bulletin Redistribution

                Citrix XenServer Multiple Security Updates
                              5 December 2014


        AusCERT Security Bulletin Summary

Product:           Citrix XenServer
Publisher:         Citrix
Operating System:  Citrix XenServer
Impact/Access:     Denial of Service    -- Existing Account
                   Increased Privileges -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2014-8867 CVE-2014-8866 CVE-2014-8595

Reference:         ESB-2014.2258

Original Bulletin:

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

Citrix XenServer Multiple Security Updates


    Created onNov 18, 2014

    Updated onDec 03, 2014

Security Bulletin Severity : High

See Applicable Products

Description of Problem

A number of security vulnerabilities have been identified in Citrix XenServer.
These vulnerabilities could, if exploited, allow unprivileged code in an HVM 
guest to gain privileged execution within that guest and also allow privileged
code within a PV or HVM guest to crash the host or other guests.

These vulnerabilities affect all currently supported versions of Citrix 
XenServer up to and including Citrix XenServer 6.2 Service Pack 1.

The following vulnerabilities have been addressed:

CVE-2014-8595 (High): Missing privilege level checks in x86 emulation of 
far branches

CVE-2014-8866 (Medium): Excessive checking in compatibility mode hypercall
argument translation

CVE-2014-8867 (Medium): Insufficient bounding of "REP MOVS" to MMIO 
emulated inside the hypervisor

CVE-2014-1666 (Low): PHYSDEVOP_{prepare,release}_msix exposed to 
unprivileged guests

What Customers Should Do

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

Citrix XenServer 6.2 Service Pack 1: CTX141717 -

Citrix XenServer 6.1: CTX141718 -

Citrix XenServer 6.0.2: CTX141720 -

Customers using Citrix XenServer 6.0.2 in the Common Criteria evaluated 
configuration should apply the following hotfixes: 

CTX141719 -

Citrix XenServer 6.0.0: CTX141721 -

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 

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

December 3rd 2014 Initial publishing

Applicable Products

    XenServer 6.1.0

    XenServer 6.0.2

    XenServer 6.0

    XenServer 6.2.0

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

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