Citrix has identified a vulnerability in the XenApp and XenDesktop which could potentially be exploited by sending a well crafted packet to the XML vulnerable component. The code will run with the privileges of the service.

Citrix has posted a list of versions vulnerable to this issue with the hotfixes available here.

[1] http://support.citrix.com/article/CTX129430
 

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Guy Bruneau IPSS Inc. gbruneau at isc dot sans dot edu