I. BACKGROUND
Citrix Presentation Server is a product designed to allow remote access to
applications over a network. More information can be found at the Citrix's
web site:
http://www.citrix.com/English/ps2/products/product.asp?contentID=186.
II. DESCRIPTION
Remote exploitation of an input validation error in Citrix Systems Inc.'s
Metaframe Presentation Server 4.0 IMA service may allow an attacker to
cause a denial of service (DoS) condition.
The IMA (Independent Management Architecture) server component Citrix's
Presentation Server (previously known as Metaframe) contains an input
validation error in the handling of certain packet types. By constructing a
specific packet, it is possible to cause the service to reference an
unmapped memory address. This causes an unhandled exception, which in turn
causes the service to exit, resulting in a DoS condition.
III. ANALYSIS
Successful exploitation of this vulnerability would allow a remote attacker
to cause the IMA server component of the Citrix Presentation Server to
crash, preventing access to the resources being shared on the server.
IV. DETECTION
This vulnerability has been confirmed to affect Citrix Presentation Server
4.0. Previous versions may also be affected.
V. WORKAROUND
iDefense is unaware of any effective workarounds for this vulnerability.
VI. VENDOR RESPONSE
The vendor has released the following advisory to address this issue:
http://support.citrix.com/article/CTX111186
VII. CVE INFORMATION
A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not
been assigned yet.
VIII. DISCLOSURE TIMELINE
07/03/2006 Initial vendor notification
07/05/2006 Initial vendor response
11/09/2006 Coordinated public disclosure
IX. CREDIT
This vulnerability was reported to iDefense by Eric Detoisien.
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X. LEGAL NOTICES
Copyright © 2006 iDefense, Inc.
Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDefense. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please e-mail customer service for permission.
Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.
