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D-Link DSL-500T ADSL XSRF / Brute Force

D-Link DSL-500T ADSL XSRF / Brute Force
Posted Dec 11, 2011
Authored by MustLive

The D-Link DSL-500T ADSL router suffers from cross site request forgery, brute force and predictable resource location vulnerabilities.

tags | advisory, cracker, vulnerability, csrf
SHA-256 | e1197c8518b708baebfcc89aaa6623dcba5d96a385f0f97bae7e527c4ce530bc

D-Link DSL-500T ADSL XSRF / Brute Force

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Hello list!

I want to warn you about security vulnerabilities in D-Link DSL-500T ADSL
Router.

These are Predictable Resource Location, Brute Force and Cross-Site Request
Forgery vulnerabilities. I knew about first two holes already from October
2005, when started to use this router at the office, and third hole I've
found in April. This is my first advisory from series of advisories about
vulnerabilities in D-Link products.

-------------------------
Affected products:
-------------------------

Vulnerable is the next model: D-Link DSL-500T ADSL Router.

----------
Details:
----------

Predictable Resource Location (WASC-34):

http://192.168.1.1

The control panel of modem is placed at default path with default login and
password (admin:admin). Which allows for local users (which have access to
PC or via LAN) and also for remote users via Internet (via CSRF) to get
access to control panel and change router's settings.

Default above-mentioned settings - it's standard practice of developers of
ADSL routers. But ISPs should make changes, but particularly ISP Ukrtelecom
doesn't do it in modems Callisto (which he offers to his clients), at that
ISP Intertelecom, which offered this DSL-500T to us in rent, exactly changed
default password in control panel.

Brute Force (WASC-11):

In login form http://192.168.1.1 there is no protection against Brute Force
attacks. Which allows to pick up password (if it was changed from default),
particularly at local attack. E.g. via LAN malicious users or virus at some
computer can conduct attack for picking up the password, if it was changed.

CSRF (WASC-09):

Lack of protection against Brute Force (such as captcha) also leads to
possibility of conducting of CSRF attacks, which I wrote about in the
article Attacks on unprotected login forms
(http://lists.webappsec.org/pipermail/websecurity_lists.webappsec.org/2011-April/007773.html).
It allows to conduct remote login. Which will be in handy at conducting of
attacks on different CSRF and XSS vulnerabilities in control panel. Which
quite can be in it, as I can say based on vulnerabilities in other D-Link
device, which I've bought in November 2011, and also based on holes in Iskra
Callisto 821+.

I mentioned about these vulnerabilities at my site
(http://websecurity.com.ua/5554/).

Best wishes & regards,
MustLive
Administrator of Websecurity web site
http://websecurity.com.ua

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