Public Vulnerability Reports

Citrix Presentation Server 4.0 IMA Service Invalid Name Length DoS Vulnerability



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:


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.


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.


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


iDefense is unaware of any effective workarounds for this vulnerability.


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


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


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


This vulnerability was reported to iDefense by Eric Detoisien.

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Copyright © 2006 Verisign, Inc.

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