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Citrix Metaframe Presentation Server Policy Filtering Bypass
Secunia Advisory: SA17032
Release Date: 2005-10-03
Last Update: 2006-01-20
Popularity: 8,067 views

Critical:
Moderately critical
Impact: Security Bypass
Where: From remote
Solution Status: Vendor Workaround

Software:Citrix MetaFrame Presentation Server 3.x
Citrix Presentation Server 4.x

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CVE reference:CVE-2005-3134


Description:
Gustavo Gurmandi has reported a vulnerability in Citrix MetaFrame Presentation Server, which can be exploited by malicious users to bypass certain security restrictions.

The vulnerability is caused due to a validation error when policy filtering decisions are made based on the user's client name. This can be exploited by malicious users to bypass certain policy restrictions by modifying the client name in the "launch.ica" file

The vulnerability has been reported in the following versions:
* 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

Solution:
Do not use client names for policy filtering decision.

Provided and/or discovered by:
Gustavo Gurmandi, GrupoITPro Security Research Community.

Changelog:
2006-01-20: Added CVE reference.

Original Advisory:
Citrix:
http://support.citrix.com/kb/entry!de...tegoryID=275&externalID=CTX107705

GrupoITPro Security Research Community:
http://www.grupoitpro.com.ar/ctxpoliciesbypass.txt


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