n.runs-SA-2010.002 - Alcatel-Lucent - arbitrary code execution on OmniVista 4760

n.runs AG
http://www.nruns.com/ security(at)nruns.com
n.runs-SA-2010.002 20-September-2010

Vendor: Alcatel
Affected Products: OmniVista 4760 server: all versions prior to
release R5.1.06.03.c_Patch3.
Vulnerability: arbitrary code execution
Risk: High
CVE-Number: CVE-2010-3281

Vendor communication:
2010/02/16 initial information to Alcatel-Lucent from n.runs AG
2010/02/16 initial response from Alcatel-Lucent to investigate
responsibility within Alcatel-Lucent group
2010/02/18 request from Alcatel-Lucent about former vendor
communication
2010/02/18 response and that n.runs initially found the bug in 2006
during a
customer project and the customer has been trying from
then until
the beginning of 2010 to get the issue fixed. Customer
has
requested from n.runs to take over the handling of
vulnerability
and to publish it.
2010/02/24 confirmation from Alcatel-Lucent that the vulnerability
exists
2010/03/15 n.runs confirms CVSS rating
2010/08/10 Alcatel-Lucent confirms that vulnerability is fixed
(fix date: 2010/05/06)
2010/08/23 Alcatel-Lucent proposes September 15th as the publication
date
and requests a CVE number
2010/09/13 Business Parters of Alcatel-Lucent are informed about the
vulnerability
2010/09/15 CVE number received
2010/09/20 n.runs AG releases this advisory

Overview:

Part of the Alcatel Omnivista 4760 administration software of the Alcatel
4400 PBX is an HTTP proxy. It is used to tunnel ssh-connections to the
ssh-ports
of the PBX within the internal network.
This proxy is vulnerable to a remote buffer overflow.

Description:

By sending a long HTTP GET request it is possible to overwrite CPU
registers.
Due to this vulnerability, an attacker can control the execution path
remotely.

Impact:

Arbitray code can be executed on the proxy server from remote.
On a normal setup the HTTP proxy is running on the same machine as the 4760
management system.
Due to this vulnerability an attacker can gain access to administrative
functions of the PBX and to the internal network, possibly a DMZ.

Solution

Mitigation
Protect the HTTP proxy function on the 4760 server with the Windows internal

firewall by restricting access to workstations with a known pre-declared
IP address:
In the windows firewall configuration, for the exception concerning the 4760

Communication Server, modify the extent of allowed systems by removing the
authorization for any IP system with the precise list of the specifically
allowed IP addresses.
Note: include the 4760 server own address in this list to enable the
embedded
4760 client as well.

Fixed Software Versions/Patches and how to obtain them
OmniVista 4760 version R5.1: install the Patch3 for version
5.1.06.03.c_Patch2
(or the full delivery 5.1.06.03.c_Patch3 when it is available).
OmniVista 4760 version R5.0 and prior: upgrade to OmniVista 4760 version
R5.1
and installation of patch is recommended.

Credits:
Bug found by Axel Rengstorf of Bluebox Security, Dirk Breiden and
Florian Walther of n.runs AG.

References:
This Advisory and Upcoming Advisories:
http://www.nruns.com/security_advisory.php

About n.runs:
n.runs AG is a vendor-independent consulting company specialising in the
areas of: IT Infrastructure, IT Security and IT Business Consulting.

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