full-disclosure - strange domain name in phishing email

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Date: Thu Mar 16 16:23:13 2006
From: arley.leal at sonae.com (Arley Barros Leal)
Subject: strange domain name in phishing email

Hmmm...isn't that a base-10 representation? One may use the IP base-10 for phishing, one classic example would be:

	<a href="http://www.vatican.com@...4596099/">www.vatican.com</a>

You may also use the base-10 representation for ping, nslookup and so on...it works for me at least...

For some sites I was indeed able to bypass a (thousand-dollars) content filtering engine using this hack..

Cheers,
Arley Silveira.
S?nior Systems Engineer
Cisco VPN/Firewall Specialist, CCNA, MCSE Security, 
MCSA, MCP+I, Security+, iNET+, OCP, CIWA

-----Original Message-----
From: full-disclosure-bounces@...ts.grok.org.uk [mailto:full-disclosure-bounces@...ts.grok.org.uk] On Behalf Of Juha-Matti Laurio
Sent: quinta-feira, 16 de Mar?o de 2006 Arley @ 16:03
To: Michael Holstein; full-disclosure@...ts.grok.org.uk
Subject: Re: [Full-disclosure] strange domain name in phishing email

It seems that this case has the name Dotless IP Address Security Issue and KB article #168617 http://support.microsoft.com/?kbid=168617
describes it even in IE4.
Correct if I'm wrong.

- Juha-Matti

> IIRC, Microsoft changed that as one of the security updates to IE. For 
> a time, it was a popular phishing trick. I also remember there was a 
> way to do that (or something similar) to bypass the security zones in 
> IE and make it think it was a trusted site, but can't find that reference at hand.
> 
> The "rest" of windows will still do it though. Try "ping 2887060730" 
> or "telnet 2887060730 80".
> 
> ~Mike.

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