-- Corsaire Security Advisory -- Title: Mitel 3300 ICP web interface session hijacking issue Date: 17.08.04 Application: Mitel Web Management Interface Environment: Mitel 3300 ICP (prior to 4.2.2.11) Author: Stephen de Vries [stephen@private] Audience: General distribution Reference: c040817-002 -- Scope -- The aim of this document is to define a vulnerability in the 3300 Integrated Communication Platform as supplied by Mitel [1], that allows a remote attacker to hijack legitimate users' web management sessions. -- History -- Discovered: 17.08.04 (Stephen de Vries) Vendor notified: 27.08.04 Document released: 28.02.05 -- Overview -- The 3300 ICP [2] 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. This session ID was found to be trivially predictable and allows attackers to hijack legitimate users' sessions. -- Analysis -- The Web Interface on the 3300 ICP generates the session ID after successful authentication. The HTML page returned after successful authentication contains Javascript code that sets a cookie with the name "parentsessionid" to the value of the session ID. By making successive authentication requests a list of session IDs can be retrieved. A random sample follows: parentsessionid=3 parentsessionid=4 parentsessionid=5 parentsessionid=6 parentsessionid=7 parentsessionid=8 parentsessionid=9 parentsessionid=10 parentsessionid=11 parentsessionid=12 It is quite clear that these IDs are sequential. Further investigation revealed that the Web Interface has an upper limit of 50 active session IDs. This further reduces the number of IDs that an attacker has to guess before being able to hijack a user's session. -- 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-2004-0944 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardises names for security problems. -- References -- [1] http://www.mitel.com [2] http://www.mitel.com/DocController?documentId=9555&c=9511&sc=9514 -- Revision -- a. Initial release. b. Minor revision. -- Distribution -- 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. -- 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 2004-2005 Corsaire Limited. All rights reserved.
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