OpenConnect Affected

Notified:  December 21, 2004 Updated: February 20, 2005



Vendor Statement

Vulnerability Note VU#552561 OpenConnect WebConnect MS-DOS Device Name Denial of Service Overview When requesting a DOS device name in the URL, the server may stop responding to any further requests. I. Description From the OpenConnect webpage: WebConnect is client-server based software that provides secure browser based emulation to mainframe, midrange and UNIX systems. WebConnect enables enterprise organizations to provide suppliers, partners and employees with secure access to vital applications and information. Enterprises increase productivity and profits, and retain all the advantages of secure host connectivity to new and existing applications in "real-time." Because WebConnect is non-intrusive, it provides secure SSL encrypted information migration and access without requiring modification to the host. With its patented secure, "persistent connectivity" technology, only WebConnect is capable of supporting tens of thousands of concurrent browser-based users. WebConnect 6.4.4 and 6.5 do not check for DOS device names within requested URLs. This may allow a denial of service attack by requesting a DOS device name. This affects only the Windows versions of WebConnect. This can affect all http services provided by WebConnect. II. Impact Remote attackers could block access to WebConnect by causing the service to become unresponsive. III. Solution Update to a corrected version of WebConnect This vulnerability has been corrected in WebConnect versions 6.4.5 and 6.5.1. Licensed users of WebConnect may contact OpenConnect Technical Support to receive these updated versions. Credit Thanks to Dennis Rand of the Danish Computer Incident Response Team for reporting this vulnerability. This document was written by OpenConnect WebConnect Development based primarily on information provided by Dennis Rand

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.


Licensed users can send mail to OpenConnect technical support mailto:, or call +1-972-888-0678.