Citrix Hypervisor Security Update

Description of Problem

An issue has been discovered in Citrix Hypervisor that, if exploited, could potentially allow an attacker on the management network to enumerate valid administrative account usernames. Note that this attack does not disclose the corresponding passwords and does grant not access to the attacked system.

This issue has the following identifier:

• CVE-2018-15473

This issue affects Citrix XenServer 7.1 LTSR CU2

Mitigating Factors

Customers who do not have ssh access enabled to the control domain are not affected by this issue. Customers who have not enabled Active Directory integration for administrative login will have minimal usernames exposed to attacker enumeration.

What Customers Should Do

A hotfix has been released to address this issue. Citrix recommends that customers running Citrix XenServer 7.1 LTSR CU2 install this hotfix as their patching schedule allows.

The hotfix can be downloaded from the following location:

Citrix XenServer 7.1 LTSR CU2: CTX269660 – <https://support.citrix.com/article/CTX269660&gt;

Acknowledgements

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/&gt;_.

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 _ <https://www.citrix.com/support/open-a-support-case.html&gt;_.

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

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