[Full-disclosure] User Enumeration Flaw

[Simon Smith]

Mar,
    You are a dork... but thanks for posting this to the world, its very
useful, we'll get right on fixing this, can we fix you too?

Mar.Shatz at education.gov.il wrote:
> whitehouse.gov          MX      100 mailhub-wh2.whitehouse.gov
> noone at box:~$ 
> noone at 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 at com.com
> 250 2.1.0 bob at com.com... Sender ok
> rcpt to:gbush at whitehouse.gov
> 550 5.1.1 gbush at whitehouse.gov... User unknown
> rcpt to:president at whitehouse.gov
> 250 2.1.5 president at whitehouse.gov... Recipient ok
> quit
> 221 2.0.0 esgeop03.whitehouse.gov closing connection
> Connection closed by foreign host.
>
> User enumeration at the whitehouse
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