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Insecure Library Loading
Not critical

Citrix Presentation Server Published Application Execution Weakness

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Release Date:  2007-11-15    Last Update:  2008-04-07    Views:  13,742

Secunia Advisory SA27633

Where:

From remote

Impact:

System access

Solution Status:

Vendor Patch

CVE Reference(s):

No CVE references.

Description


A weakness has been reported in Citrix Presentation Server, which potentially can be exploited by malicious people to compromise a vulnerable system.

The problem is that published applications and potentially other applications can be launched when invoking an ICA connection to a Citrix Presentation Server. This can be exploited to e.g. launch published applications with specially crafted parameters on a Citrix Presentation Server when a user is tricked into visiting a malicious website or opening a malicious .ICA file.

Successful exploitation requires that the target user is authorized to execute the published application and that the Citrix Presentation Server is configured e.g. to allow parameters to be passed to published applications.

The weakness affects the following products:
* Access Essentials 1.0
* Citrix Access Essentials 1.5
* Citrix Access Essentials 2.0
* Citrix MetaFrame Presentation Server 3.0 for Microsoft Windows 2000
* Citrix MetaFrame Presentation Server 3.0 for Microsoft Windows 2003
* Citrix Presentation Server 4.0 for Microsoft Windows 2000
* Citrix Presentation Server 4.0 for Microsoft Windows 2003
* Citrix Presentation Server 4.0 x64 Edition
* Citrix Presentation Server 4.5 for Windows Server 2003
* Citrix Presentation Server 4.5 for Windows Server 2003 Feature Pack 1
* Citrix Presentation Server 4.5 for Windows Server 2003 x64 Edition


Solution:
Apply Hotfix Rollup Pack 2 (see vendor's advisory for details).

Provided and/or discovered by:
.ICA files launching published applications via the "InitialProgram" key originally reported by wirepair and recently discussed by pdp.

Original Advisory:
CTX115245:
http://support.citrix.com/article/CTX115245

GNUCITIZEN:
http://www.gnucitizen.org/blog/citrix-owning-the-legitimate-backdoor/

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Citrix Presentation Server Published Application Execution Weakness

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