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Citrix Presentation Server 4.0 IMA Service Invalid Name Length DoS Vulnerability

11.09.06

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.

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.

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.

DETECTION

This vulnerability has been confirmed to affect Citrix Presentation Server 4.0. Previous versions may also be affected.

WORKAROUND

iDefense is unaware of any effective workarounds for this vulnerability.

VENDOR RESPONSE

The vendor has released the following advisory to address this issue:

http://support.citrix.com/article/CTX111186

CVE INFORMATION

A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet.

DISCLOSURE TIMELINE

07/03/2006 Initial vendor notification
07/05/2006 Initial vendor response
11/09/2006 Coordinated public disclosure

CREDIT

This vulnerability was reported to iDefense by Eric Detoisien.

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LEGAL NOTICES

Copyright © 2006 Verisign, Inc.

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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.