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| 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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