Vulnerability in Citrix Presentation Server could allow authenticated users to gain unauthorized access to a desktop session
Severity: Medium
Description of Problem
Citrix Presentation Server provides access control to both published applications and published desktops. Under specific circumstances, an authenticated user may be able to access a desktop session despite being unauthorized to access a published desktop.
This vulnerability affects the following products:
• Citrix Presentation Server versions up to and including 4.5
• Citrix Access Essentials versions up to and including 2.0
• Citrix Desktop Server version 1.0
Mitigating Factors
The user must authenticate to Citrix Presentation Server for this vulnerability to apply.
This vulnerability can be used by an authenticated user to gain access to a desktop running in the context of their own account. It does not allow a user to gain any additional Windows privileges, access rights or capabilities.
What Customers Should Do
A hotfix has been released to address this issue. Citrix recommends that affected customers install the hotfix which can be downloaded from the following locations:
Citrix Presentation Server 4.5 for Windows Server 2003:
EN - http://support.citrix.com/article/CTX116960
FR - http://support.citrix.com/article/CTX116962
GE - http://support.citrix.com/article/CTX116961
JA - http://support.citrix.com/article/CTX116964
ES - http://support.citrix.com/article/CTX116963
Citrix Presentation Server 4.5 for Windows Server 2003 x64 Editions:
EN - http://support.citrix.com/article/CTX116954
FR - http://support.citrix.com/article/CTX116956
GE - http://support.citrix.com/article/CTX116957
JA - http://support.citrix.com/article/CTX116959
ES - http://support.citrix.com/article/CTX116958
Citrix Presentation Server 4.0 for Windows 2000 Server:
EN - http://support.citrix.com/article/CTX116521
FR - http://support.citrix.com/article/CTX116522
GE - http://support.citrix.com/article/CTX116528
JA - http://support.citrix.com/article/CTX116529
ES - http://support.citrix.com/article/CTX116527
Citrix Presentation Server 4.0 for Windows Server 2003:
EN - http://support.citrix.com/article/CTX116008
FR - http://support.citrix.com/article/CTX116523
GE - http://support.citrix.com/article/CTX116111
JA - http://support.citrix.com/article/CTX116009
ES - http://support.citrix.com/article/CTX116524
Citrix Access Essentials 2.0:
EN - http://support.citrix.com/article/CTX116960
FR - http://support.citrix.com/article/CTX116962
GE - http://support.citrix.com/article/CTX116961
JA - http://support.citrix.com/article/CTX116964
ES - http://support.citrix.com/article/CTX116963
Citrix Access Essentials 1.5:
EN - http://support.citrix.com/article/CTX116008
FR - http://support.citrix.com/article/CTX116523
GE - http://support.citrix.com/article/CTX116111
JA - http://support.citrix.com/article/CTX116009
ES - http://support.citrix.com/article/CTX116524
Citrix Access Essentials 1.0:
EN - http://support.citrix.com/article/CTX116008
FR - http://support.citrix.com/article/CTX116523
GE - http://support.citrix.com/article/CTX116111
JA - http://support.citrix.com/article/CTX116009
ES - http://support.citrix.com/article/CTX116524
Citrix Desktop Server 1.0 for Windows Server 2003:
EN - http://support.citrix.com/article/CTX116548
Citrix Desktop Server 1.0 for Windows Server 2003 x64 Editions:
EN - http://support.citrix.com/article/CTX116549
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 Base 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 secure@citrix.com containing the exact version of the product in which the vulnerability was found and the steps needed to reproduce the vulnerability.
