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Citrix Metaframe Presentation Server Policy Filtering Bypass
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Secunia Advisory:
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SA17032
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Release Date:
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2005-10-03
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Last Update:
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2006-01-20
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Popularity:
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8,070 views
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Critical:
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Moderately critical
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Impact:
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Security Bypass
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Where:
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From remote
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Solution Status:
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Vendor Workaround
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| Software: | Citrix MetaFrame Presentation Server 3.x
Citrix Presentation Server 4.x
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| CVE reference: | CVE-2005-3134
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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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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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