Security Incidents: Re: "Worm" behavior -- port 80 honey pots

[Alexander Bochmann <securityfocus-incidents () freinet de>]

...on Mon, Oct 15, 2001 at 03:08:39PM -0600, Ryan Russell wrote:

> >   1) Sometimes the honey pot will send an IDENT request to the remote
> > system. At least one of the 'worms' in circulation recently will
> > immediately drop the port 80 connection when the IDENT probe is sent
> I used to have this problem with firewalled mail servers.  If one of the
> mail servers was configured to do ident lookups, and there was a firewall
> that just dropped ident attempts (no RST), then the mail servers would sit
> around for 2-5 minutes until the ident TCP connect timed out.  Only then
> would the mail connection deliver any data.  This could be related, and
Don't think so; this is default behaviour with sendmail, at least.

Sendmail has a configurable timeout for ident lookups, and will 
wait for an answer until the timeout expires. Default from 
sendmail distribution is 30 seconds, but possible some vendors 
use a higher value. Don't know about other MTAs.

Alex.


----------------------------------------------------------------------------
This list is provided by the SecurityFocus ARIS analyzer service.
For more information on this free incident handling, management 
and tracking system please see: http://aris.securityfocus.com