Hi all,
My apologies for the bad link. The correct link to register for the Virtual
Users Group is below:
https://sourcefire.webex.com/sourcefire/j.php?ED=86930197&RG=1
Mike
On 9/18/06 10:51 PM, "snort-users-request@lists.sourceforge.net"
<snort-users-request@lists.sourceforge.net> wrote:
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Today's Topics:
1. SMTP preprocessor triggering on incorrect data (Jason Haar)
2. Inaugural Snort Virtual Users Group Meeting Sept. 28
(Mike Guiterman)
3. Re: Inaugural Snort Virtual Users Group Meeting Sept. 28
(Will Metcalf)
4. Re: Inaugural Snort Virtual Users Group Meeting Sept. 28 (Jason)
5. Re: error: log_tcpdump TcpdumpInitlogefile():no error (Joel Esler)
----------------------------------------------------------------------
Message: 1
Date: Tue, 19 Sep 2006 07:12:03 +1200
From: Jason Haar <Jason.Haar@trimble.co.nz>
Subject: [Snort-users] SMTP preprocessor triggering on incorrect data
To: snort-users@lists.sourceforge.net
Message-ID: <450EEF83.3040003@trimble.co.nz>
Content-Type: text/plain; charset=ISO-8859-1
I just had an FP event generated by the SMTP preprocessor
# smtp: SMTP normalizer, protocol enforcement and buffer overflow
preprocessor smtp: ports { 25 587 } ignore_tls_data ignore_data
inspection_type stateful normalize cmds normalize_cmds { EXPN VRFY
RCPT } alt_max_command_line_len 260 { MAIL }
alt_max_command_line_len 300 { RCPT } alt_max_command_line_len 500 {
HELP HELO ETRN } alt_max_command_line_len 255 { EXPN VRFY }
The event was "Attempted specific command buffer overflow: HELP, 941
chars", but the captured packet shows the word help was actually within
the DATA component of the SMTP stream - not a SMTP command. It was from
one of our internal Exchange servers to another Exchange server, so I
assume their initial SMTP dialog was vaguely compliant. :-)
This is snort 2.6.0.2 under RHE4
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