Description of Problem
A vulnerability has been discovered in XenServer that, when triggered, could allow a subset of Xen API (XAPI) calls to be executed without proper authentication.
This vulnerability affects the following versions of XenServer only:
• XenServer 5.0 Update 3 and earlier
• XenServer 5.5
Customers running XenServer 5.5 Update 1 or later, are not affected by this vulnerability.
What Customers Should Do
A hotfix has been released to address this issue. Citrix recommends that customers using affected versions of XenServer install this hotfix, which can be downloaded from the following locations:
Citrix XenServer 5.0:
Citrix XenServer 5.5:
This vulnerability is addressed in XenServer 5.5 Update 1, which is available at
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. Information for contacting Citrix Technical Support is available at http://www.citrix.com/English/ss/supportContacts.asp.
Reporting Security Vulnerabilities to Citrix
Citrix welcomes input regarding the security of its products and considers any and all potential vulnerabilities seriously. If you would like to report a security issue to Citrix, please compose an e-mail to email@example.com containing the exact version of the product in which the vulnerability was found and the steps needed to reproduce the vulnerability.