[VulnWatch] Corsaire Security Advisory - Mitel 3300 ICP web interface DoS issue

From: advisories (advisories_at_corsaire.com)
Date: 02/28/05 

To: <vulnwatch@vulnwatch.org>
Date: Mon, 28 Feb 2005 18:08:42 -0000

-- 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@corsaire.com]
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 [1], 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 [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.
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 --

[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 --

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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