Vulmon
Description of Problem
A security vulnerability has been identified in Citrix XenServer that may allow malicious privileged-mode code running within an HVM guest VM to compromise the host.
This vulnerability affects all currently supported versions of Citrix XenServer up to and including Citrix XenServer 7.0.
The following vulnerability has been addressed:
- CVE-2016-9637: QEMU ioport array overflow
Mitigating Factors
Customers with only PV guests are unaffected by this issue.
Customers with HVM guests where the guest operating system and administrators are trusted are significantly less at risk from this issue.
What Customers Should Do
Hotfixes have been released to address these issues. Citrix strongly recommends that affected customers install these hotfixes, which can be downloaded from the following locations:
- Citrix XenServer 7.0: CTX219203 – https://support.citrix.com/article/CTX219203
- Citrix XenServer 6.5 SP1: CTX219202 – https://support.citrix.com/article/CTX219202
- Citrix XenServer 6.2 SP1: CTX219201 – https://support.citrix.com/article/CTX219201
- Citrix XenServer 6.0.2 Common Criteria: CTX219200 – https://support.citrix.com/article/CTX219200
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 https://www.citrix.com/support/open-a-support-case.html.
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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