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Re: smtp: Attempted command buffer overflow
From: Phil Daws <uxbod () splatnix net>
Date: Fri, 19 Apr 2013 08:37:43 +0100 (BST)

Still seeing a huge amount of these and the payload does not appear to be over the threshold.  How would one best 
analyze why this is happening ?

Thanks.

----- Original Message -----
From: "Phil Daws" <uxbod () splatnix net>
To: snort-users () lists sourceforge net
Sent: Wednesday, 17 April, 2013 1:38:06 PM
Subject: Re: [Snort-users] smtp: Attempted command buffer overflow

Manuel, 

thank you for the reply but I am at a loss as to what you mean ? I thought the rule was saying that the number of bytes 
in the HELO/EHLO line was > 512 as defined by : 

max_command_line_len 512 

in the preprocessor section of snort.conf. 

Am I wrong in my understanding ? 

Thanks.


----- Original Message ----- 
From: "Manuel Garcia-Zamora" <zamoram () uk innovation-group com> 
To: "Phil Daws" <uxbod () splatnix net> 
Sent: Wednesday, 17 April, 2013 9:33:57 AM 
Subject: RE: smtp: Attempted command buffer overflow 

Phil 
This probably is because that email server lists.sourceforge.net is not defined as corporate mail server in the email 
servers in the configuration file therefore this is not an authorized email relay server to connect by smtp. 

You should not allow any outbound SMTP , if this is for a authorized source then you can create an exception to the 
this alert by source IP 

Regards 

Manuel 

-----Original Message----- 
From: Phil Daws [mailto:uxbod () splatnix net] 
Sent: 17 April 2013 09:07 
To: snort-users () lists sourceforge net 
Subject: [Snort-users] smtp: Attempted command buffer overflow 

Hello, 

have recently installed Snort and am beginning to see a lot of alerts from the SMTP preprocessor for SID 124:1:1. 
Looking at the payload data it shows: 

0000000: 45 48 4c 4f 20 6c 69 73 74 73 2e 73 6f 75 72 63 65 66 6f 72 67 65 2e 6e 65 74 EHLO.lists.sourceforge.net 
000001A: 0d 0a .. 

this to an untrained eye looks okay so why would it be tripping the test ? 

Thanks. 

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analytics on semi-structured data. The platform includes APIs for building
apps and a phenomenal toolset for data science. Developers can use
our toolset for easy data analysis & visualization. Get a free account!
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Precog is a next-generation analytics platform capable of advanced
analytics on semi-structured data. The platform includes APIs for building
apps and a phenomenal toolset for data science. Developers can use
our toolset for easy data analysis & visualization. Get a free account!
http://www2.precog.com/precogplatform/slashdotnewsletter
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