-- Corsaire Security Advisory -- Title: Mitel 3300 ICP web interface DoS issue Date: 17.08.04 Application: Mitel Web Management Interface Environment: Mitel 3300 ICP (prior to 5.2) Author: Stephen de Vries [stephen@private] Audience: General distribution Reference: c040817-003 -- Scope -- The aim of this document is to define a vulnerability in the 3300 Integrated Communication Platform as supplied by Mitel , that allows an authenticated user to deny access to other users of the web management interface. -- History -- Discovered: 17.08.04 (Stephen de Vries) Vendor notified: 27.08.04 Document released: 28.02.05 -- Overview -- The 3300 ICP  provides enterprise IP-PBX capabilities and makes use of a Web Interface to manage the device. In order to maintain a user session, the Web Interface generates a unique session ID for each user after they have successfully authenticated. Once the client has authenticated, this session ID is used as a shared secret to authenticate the client to the server for all subsequent requests. The Web Interface has an upper limit of 50 active session IDs. A malicious user could authenticate 50 times and thereby deny access to the Web Interface for other users. The scope of this attack is limited to users with access to valid authentication credentials, or who exploit another vulnerability to gain access to a valid session. -- Analysis -- Session IDs are generated after authentication and valid sessions are disposed of when the user logs out, or when the browser window is closed. Authentication can be performed by an HTTP POST request to the URL: http://
>/esm_validate.asp and using the variables: hiddenUid and hiddenPwd for the username and password respectively. By authenticating 50 times without logging out, the available session IDs are exhausted and subsequent authentication requests are denied. This prevents legitimate users from accessing the web interface. Sessions remained active for more than 1 hour, this means that the denial of service condition lasts for at least 1 hour without having to re-launch the attack. -- Recommendations -- The vendor has released a revised version of the software that does not exhibit this issue. This has not been independently verified by Corsaire. -- CVE -- The Common Vulnerabilities and Exposures (CVE) project has assigned the name CAN-2004-0945 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardises names for security problems. -- References --  http://www.mitel.com  http://www.mitel.com/DocController?documentId=9555&c=9511&sc=9514 -- Revision -- a. Initial release. b. Minor revision. -- Distribution -- This security advisory may be freely distributed, provided that it remains unaltered and in its original form. -- Disclaimer -- The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Corsaire accepts no responsibility for any damage caused by the use or misuse of this information. -- About Corsaire -- Corsaire are a leading information security consultancy, founded in 1997 in Guildford, Surrey, UK. Corsaire bring innovation, integrity and analytical rigour to every job, which means fast and dramatic security performance improvements. Our services centre on the delivery of information security planning, assessment, implementation, management and vulnerability research. A free guide to selecting a security assessment supplier is available at http://www.penetration-testing.com Copyright 2004 Corsaire Limited. All rights reserved.
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