From Secunia:
Description:
A vulnerability has been reported in Citrix Presentation Server Client, which potentially can be exploited by malicious people to compromise a user’s system.
The vulnerability is caused due to an unspecified error within the support for ICA connections through a proxy server. This may be exploited to execute arbitrary code when a user e.g. visits a malicious web site.
The vulnerability reportedly affects versions prior to 10.0.
Solution:
Upgrade to version 10.0 or later
[tags]Citrix, Code Execution, Exploit[/tags]