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             AUSCERT External Security Bulletin Redistribution

                Citrix XenServer Shellshock Security Update
                              23 October 2014


        AusCERT Security Bulletin Summary

Product:           Citrix XenServer
Publisher:         Citrix
Operating System:  Citrix XenServer
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2014-7187 CVE-2014-7186 CVE-2014-7169
                   CVE-2014-6278 CVE-2014-6277 CVE-2014-6271

Reference:         ASB-2014.0114

Original Bulletin: 

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Citrix XenServer Shellshock Security Update


Created on Sep 30, 2014

Updated on Oct 10, 2014

Severity: Medium

Description of Problem

A number of security vulnerabilities have been identified in the 'bash' 
component of Citrix XenServer.  These issues include those known as 
'Shellshock' and have the following identifiers: CVE-2014-6271, 
CVE-2014-6277, CVE-2014-6278, CVE-2014-7169, CVE-2014-7186 and CVE-2014-7187.

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

In deployments where the Citrix XenServer host is configured to use DHCP for 
the host IP address allocation, this issue could allow an attacker with 
access to the management network to compromise the Citrix XenServer host.

Mitigating Factors

Customers that do not use DHCP to assign IP addresses to their Citrix 
XenServer hosts are not at risk.

What Customers Should Do

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

* Citrix XenServer 6.2 Service Pack 1: CTX141486 - Hotfix XS62ESP1014 - For 
XenServer 6.2.0 Service Pack 1

* Citrix XenServer 6.1: CTX141487- Hotfix XS61E044 - For XenServer 6.1.0

* Citrix XenServer 6.0.2: CTX141489 - Hotfix XS602E037 - For XenServer 6.0.2

* Customers using Citrix XenServer 6.0.2 in the Common Criteria evaluated 
configuration should apply the following hotfix: CTX141488 - Hotfix 
XS602ECC013 - For XenServer 6.0.2 Common Criteria

* Citrix XenServer 6.0: CTX141490 - Hotfix XS60E041 - For XenServer 6.0

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

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

Applicable Products

* XenServer 6.2.0
* XenServer 6.1.0
* XenServer 6.0.2
* XenServer 6.0

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