[Snort-users] flexresp2 is back and needs testing

pfeito pfeito at ...3422...
Mon Aug 30 04:07:03 EDT 2004


I'm currently testing flexresp2. For now I'm just using a simple rule that
terminates a FTP connection if someone tries to login with user "root".

alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"FTP root login attempt!";
flow:to_server,established; content:"USER"; nocase; content:"root";
distance:1; nocase; pcre:"/^USER\sroot/smi"; classtype:suspicious-login;
sid:1000002; rev:2; resp: reset_both;)

I try to login remotely with user root, but the connection does not
terminate. I sniffed with tcpdump and I know that it the TCP RST packets are
being sent, but the connection stays up.

Then I tried the same but with both peers on the same LAN, but with the same
results. The TCP RST packets are being sent also.

I've tcpdump logs if someone is interested in looking into them.

My snort.conf-flexresp2 config
config flexresp2_interface: eth2
config flexresp2_attempts: 10

What could be going wrong? 

Thanks in advance,

> -----Original Message-----
> From: snort-users-admin at lists.sourceforge.net [mailto:snort-users-
> admin at lists.sourceforge.net] On Behalf Of Jeff Nathan
> Sent: segunda-feira, 26 de Julho de 2004 1:33
> To: snort-users at lists.sourceforge.net
> Subject: [Snort-users] flexresp2 is back and needs testing
> Hi Snortees,
> I've got a new version of the flexible response code, sp_respond2,
> ready for testing.  This new version uses libdnet
> (http://libdnet.sourceforge.net) and is significantly faster than all
> previous versions.  During testing I was able to reset TCP connections
> where both the client and server were on the same LAN.
> The patch is attached to this message but if you'd like to download it,
> it's also available from
> http://cerberus.sourcefire.com/~jeff/archives/snort/sp_respond2/
> If you encounter any problems with the attached patch, refer to the
> website for an update before sending email.
> It's most helpful if you're somewhat experienced with Snort.  For the
> time being I'd like to avoid tutoring users during testing.

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