Citrix Presentation Server 4.0 IMA Service Invalid Name Length DoS Vulnerability iDefense Security Advisory 11.08.06 http://labs.idefense.com/intelligence/vulnerabilities/ Nov 08, 2006 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. Get paid for vulnerability research http://labs.idefense.com/methodology/vulnerability/vcp.php Free tools, research and upcoming events http://labs.idefense.com/ 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 customerservice@xxxxxxxxxxxx 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.
