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AUSCERT External Security Bulletin Redistribution
Citrix Security Advisory for CVE-2015-3456
21 May 2015
AusCERT Security Bulletin Summary
Product: Citrix XenServer
Operating System: Citrix XenServer
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
CVE Names: CVE-2015-3456
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Citrix Security Advisory for CVE-2015-3456
CTX201078 Created on May 13, 2015 Updated on May 20, 2015
Security Bulletin Severity : High
Description of Problem
Citrix is aware of the recent vulnerability that has been reported against the
Xen hypervisor. This issue is known as the 'VENOM' vulnerability and has been
assigned the following CVE number:
Citrix is actively analysing the impact of this vulnerability on affected
products. Additional details and product-specific guidance can be found in the
following sections of this document.
Impacted Citrix Products
All supported versions of Citrix XenServer are impacted by this issue.
Hotfixes have been released to address this issue. Citrix strongly recommends
that affected customers install the relevant hotfixes as soon as possible.
These hotfixes are available on the Citrix website at the following locations:
Citrix XenServer 6.5 SP1: CTX142483 -
Citrix XenServer 6.5: CTX142482 - https://support.citrix.com/article/CTX142482
Citrix XenServer 6.2 SP1: CTX142481 -
Citrix XenServer 6.1: CTX142480 - https://support.citrix.com/article/CTX142480
Citrix XenServer 6.0.2: CTX142478 -
Customers using Citrix XenServer 6.0.2 in the Common Criteria evaluated
configuration should apply the following hotfix: CTX142479 -
Citrix XenServer 6.0.0: CTX142477 -
Citrix NetScaler Service Delivery Appliance
Citrix is actively investigating the potential impact of this issue on Citrix
NetScaler Service Delivery Appliances. In order to exploit this issue, a
malicious user would require administrative access within a virtual appliance.
In deployments where the virtual appliances and their administrators are
trusted, this issue would not present a risk.
Further information and mitigation guidance will be added to this document as
soon as it is available.
Citrix XenClient Enterprise
Citrix XenClient Enterprise is not believed to be affected by this issue.
Citrix Desktop Player for Mac
Citrix Desktop Player for Mac is not believed to be affected by this issue.
What Customers Should Do
Citrix is actively analysing the impact of this vulnerability and any required
remediation steps will be added to this document as soon as they are
Citrix recommends that customers monitor this document for any updates.
Customers can register for security bulletin alerts at the following address:
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
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
May 13th 2015 Initial publication
May 18th 2015 Reformatting and addition of XenServer, NetScaler SDX and
XenClient Enterprise sections
May 20th 2015 Update to XenServer and Desktop Player sections
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