Re: Hacker pierces hardware firewalls with web page.

[Jeff Jarmoc <jeff () jarmoc com>]

If it's what I think it is, it's much simpler than UPnP trickery.
While I can't be sure from the limited information in the article,
what they describe is very much like what's outlined on Samy Kamkar's
site; http://samy.pl/natpin

Also relevant is Dan Kaminsky's work he presented at CanSecWest 2009.
http://www.scribd.com/doc/13501365/Staring-Into-The-Abyss

-- Jeff Jarmoc


From: Farrukh Haroon <farrukhharoon () gmail com>
Date: Tue, 12 Jan 2010 10:56:16 +0300

Perhaps they are exploiting UPnP in some obscure way to achieve this?

Regards

Farrukh

On Tue, Jan 12, 2010 at 5:51 AM, <david () lang hm> wrote:


    I've seen several other posts where people make use of browser exploits to
    trick the browser into submitting a form to the router/firewall, and if the
    router has the default password, the attacker can then configure the
    firewall any way they want.

    This sounds a little different. This sounds like it is exploiting standard
    protocols.

    With FTP the client connect to the server, then at the start of a file
    transfer the client tells the server what port to connect to on the client.
    A 'helpful' firewall will watch for this message and reconfigure itself to
    allow traffic to that port. IIRC for FTP this data connection is one-way
    (with acks flowing the other way), but with SIP the port is used for data in
    both directions.

    This sounds like the attacker is managing to use javascript to make a
    connection out that the firewall thinks is a protocol like this, and then by
    specifying the port they want to attack, tricking the firewall into opening
    that port up so that it can be attacked from the server the javascript
    connected to.

    David Lang




    On Fri, 8 Jan 2010, R. DuFresne wrote:

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        In reading this, I get the impression this is not a fault in
the firewalls
        themselves, but more an issue with the configuration of firewalls having
        been 'tested' by this hacker.  Am I wrong in reading this news in that
        fashion?::


        January 6, The Register - (International) Hacker pierces hardware
        firewalls with web page. On January 5, a hacker demonstrated a way to
        identify a browser's geographical location by exploiting
weaknesses in many
        WiFi
        routers. Now, the same hacker is back with a simple method to penetrate
        hardware firewalls using little more than some javascript embedded in a
        webpage. By luring victims to a malicious link, the attacker can access
        virtually any service on their machine, even when it's behind certain
        routers that automatically block it to the outside world. The method has
        been tested on a Belkin N1 Vision Wireless router, and the
hacker says he
        suspects other devices are also vulnerable. "What this means is I can
        penetrate their firewall/router and connect to the port that I
specified,
        even though the firewall should never forward that port," the
hacker told
        the Register. "This defeats that security by visiting a simple
web page. No
        authentication, XSS, user input, etc. is required." The hacker's
        proof-ofconcept page forces the visitor to submit a hidden form on port
        6667, the standard port for internet relay chat. Using a
hidden value, the
        form surreptitiously coerces the victim to establish a DCC, or direct
        client-to-client, connection. Vulnerable  routers will then
automatically
        forward DCC traffic to the victim's internal system, and using
what's known
        as NAT traversal an attacker can  access any port that's open
on the local
        system. For the hack to work, the visitor must have an
application such as
        file transfer protocol or session initiation protocol running on his
        machine. The hack does not guarantee an attacker will be able
to compromise
        that service, but it does give the  attacker the ability to
probe it in the
        hope of finding a weak password or a vulnerability that will
expose data or
        system resources. Source:
        http://www.theregister.co.uk/2010/01/06/web_based_firewall_attack/




        Thanks,


        Ron DuFresne
        - -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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