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Re: Discovering users by RCPT TO

Subject: Re: Discovering users by RCPT TO
Date: Sat, 22 Jan 2005 11:46:03 +0100 (CET)
Interesting. It wouldn't be hard to make a Perl script (or other) that
logs into the SMTP server, then runs through a list of predefined users
to test and see if they have an account. I would call it information
disclosure for sure.

Hey pen-testers,

I've just released brutus.pl v0.9.2 that implements such an attack and
fixes some minor reliability bugs. Brutus.pl is a simple Perl script for
remote login/password bruteforce cracking. The supported protocols are:
telnet, ftp, and pop3. It's also possible to get a list of valid users
though smtp vrfy/expn, smtp rcpt (new), and cisco login information leak.

This tool is very basic and has no multi-thread support (for real-life
penetration testing you'd better take a look at thc's hydra), but it's
pretty realiable and easily customizable anyway. It can be downloaded at
the following url:

http://www.0xdeadbeef.info/code/brutus.pl

Cheers,

-- 
Marco Ivaldi
Antifork Research, Inc.   http://0xdeadbeef.info/
3B05 C9C5 A2DE C3D7 4233  0394 EF85 2008 DBFD B707

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