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Alcatel-Lucent OmniPCX Enterprise CS CGI Cookie Buffer Overflow Vulnerability

01.03.11

BACKGROUND

The Alcatel-Lucent OmniPCX Enterprise Communication Server (CS) is a communication server platform that provides multimedia call processing for both Alcatel-Lucent and third-party clients/phones. For more information, see the vendor's site found at the following link.

http://enterprise.alcatel-lucent.com/?product=OmniPCXEnterprise&page=overview

DESCRIPTION

Remote exploitation of a stack based buffer overflow vulnerability in Alcatel-Lucent's OmniPCX Enterprise Communication Server could allow an attacker to execute arbitrary code with the privileges of the affected service.

The Alcatel-Lucent OmniPCX Enterprise Communication Server (CS) is used to process, manage, and log traditional as well as VOIP based telephony. Part of the maintenance functionality consists of a web based administrative interface consisting of various CGI and PHP based scripts. The vulnerability occurs in the handling of multiple CGI applications that make up the web application.

The vulnerability occurs when parsing certain HTTP headers. String based data from the HTTP request is improperly validated, which can result in a trivial stack based buffer overflow.

ANALYSIS

Exploitation of this vulnerability results in the execution of arbitrary code with the privileges of the affected service, usually the user 'mtcl'. This user is not equivalent to root, but does have access to most of the files used for managing the OXE system.

The OXE environment consists of a custom Linux distribution. It doesn't employ any of the modern exploit mitigation defenses like ASLR or NX. As such, this vulnerability is trivial to exploit reliably.

DETECTION

iDefense has confirmed the existence of this vulnerability in OmniPCX Enterprise version 8. Alcatel-Lucent has stated that the following versions are vulnerable:

OmniPCX Enterprise: all versions prior to R9.0

OmniPCX Enterprise release R9.0: all versions prior to patch H1.301.50 (excluded).The following versions are not vulnerable:

OmniPCX Enterprise release R9.0 H1.301.50 and more recent.

OmniPCX Enterprise release R9.1 and later.

WORKAROUND

The embedded web server can be deactivated by using the netadmin command. The steps to perform this are documented in the following location of the administration guide: 11.Security > 11.9.Web server configuration > 11.9.1.Deactivate the Web server, then apply your change.

< br /> This will remove all functionality provided by the web server, but has no impact on the normal system operation.

VENDOR RESPONSE

An official fix is available for customers through Alcatel-Lucent Business Partners since mid january on their support website. An Alcatel-Lucent security advisory is available on

www.alcatel-lucent.com/security/psirt

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2011-0344 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.

DISCLOSURE TIMELINE

10/04/2010 Initial Vendor Notification
11/03/2010 Initial Vendor Reply
03/01/2011 Coordinated Public Disclosure

CREDIT

This vulnerability was reported to iDefense by Anonymous.

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LEGAL NOTICES

Copyright © 2011 Verisign, Inc.

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