Re: wpad.dat attack on Linux Apache server

From	Sandman <mr@sandman.net>
Newsgroups	comp.os.linux.networking, comp.os.linux.security, comp.infosystems.www.servers.unix
Subject	Re: wpad.dat attack on Linux Apache server
Date	2013-05-24 12:23 +0200
Message-ID	<mr-17CDE1.12235424052013@News.Individual.NET> (permalink)
References	(1 earlier) <87vc68ra57.fsf@araminta.anjou.terraraq.org.uk> <mr-05E7DC.11442724052013@News.Individual.NET> <87ppwgr8wz.fsf@araminta.anjou.terraraq.org.uk> <mr-794073.12134024052013@News.Individual.NET> <87k3mor85j.fsf@araminta.anjou.terraraq.org.uk>

Cross-posted to 3 groups.

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In article <87k3mor85j.fsf@araminta.anjou.terraraq.org.uk>,
 Richard Kettlewell <rjk@greenend.org.uk> wrote:

> >> >> While this will send a TCP reset to the misbehaving client, AIUI it will
> >> >> not send anything to your Apache, which by this point will have an open
> >> >> TCP connection and will be awaiting the start of the HTTP request.  It
> >> >> will presumably continue waiting up to some timeout.  You should be able
> >> >> to use netstat to confirm or refute this.
> >> >
> >> > Thank you for your reply. I thought "reject" just rejected the request 
> >> > and nothing came to Apache?
> >> 
> >> You’re rejecting a packet that is part of an already-established TCP
> >> connection.  iptables cannot go back in time and prevent the TCP
> >> connection from being established in the first place.
> >
> > Yes, like I said - I thought nothing came through to Apache.  But
> > looking at server-status, it seems it does anyway?
> 
> I don’t know how to put it any more clearly; I give up.

No, please don't. Maybe I am misunderstanding you? I am not trying to 
argue with you.

I thought that rejecting the TCP request in iptables blocked the request 
from ever reaching the httpd process. Obviously it isn't blocked from 
the *machine*, and I apologize if you thought that was what I meant.

Mind you, I don't get any HTTP requests in Apache, but it does increment 
the requests number in a rate faster than the normal requests I see.

You are free to call me stupid and ignorant about iptables/httpd here, 
of course, but I would still very much like to solve my problem even so 
:)

-- 
Sandman[.net]

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wpad.dat attack on Linux Apache server Sandman <mr@sandman.net> - 2013-05-24 11:22 +0200
  Re: wpad.dat attack on Linux Apache server Richard Kettlewell <rjk@greenend.org.uk> - 2013-05-24 10:37 +0100
    Re: wpad.dat attack on Linux Apache server Sandman <mr@sandman.net> - 2013-05-24 11:44 +0200
      Re: wpad.dat attack on Linux Apache server Richard Kettlewell <rjk@greenend.org.uk> - 2013-05-24 11:04 +0100
        Re: wpad.dat attack on Linux Apache server Sandman <mr@sandman.net> - 2013-05-24 12:13 +0200
          Re: wpad.dat attack on Linux Apache server Richard Kettlewell <rjk@greenend.org.uk> - 2013-05-24 11:20 +0100
            Re: wpad.dat attack on Linux Apache server Sandman <mr@sandman.net> - 2013-05-24 12:23 +0200
              Re: wpad.dat attack on Linux Apache server J G Miller <miller@yoyo.ORG> - 2013-05-24 11:07 +0000
                Re: wpad.dat attack on Linux Apache server Sandman <mr@sandman.net> - 2013-05-24 14:43 +0200
                Re: wpad.dat attack on Linux Apache server Casper H.S. Dik <Casper.Dik@OrSPaMcle.COM> - 2013-05-24 13:05 +0000
                Re: wpad.dat attack on Linux Apache server Sandman <mr@sandman.net> - 2013-05-24 15:14 +0200
                Re: wpad.dat attack on Linux Apache server Joe Beanfish <joebeanfish@nospam.duh> - 2013-05-24 13:39 +0000
                Re: wpad.dat attack on Linux Apache server Sandman <mr@sandman.net> - 2013-05-24 16:23 +0200
                Re: wpad.dat attack on Linux Apache server Richard Kettlewell <rjk@greenend.org.uk> - 2013-05-24 15:13 +0100
                Re: wpad.dat attack on Linux Apache server Sandman <mr@sandman.net> - 2013-05-24 16:26 +0200
                Re: wpad.dat attack on Linux Apache server Richard Kettlewell <rjk@greenend.org.uk> - 2013-05-24 17:38 +0100
                Re: wpad.dat attack on Linux Apache server Sandman <mr@sandman.net> - 2013-05-24 19:02 +0200
                Re: wpad.dat attack on Linux Apache server Richard Kettlewell <rjk@greenend.org.uk> - 2013-05-24 18:45 +0100
                Re: wpad.dat attack on Linux Apache server Sandman <mr@sandman.net> - 2013-05-24 21:12 +0200
                Re: wpad.dat attack on Linux Apache server Casper H.S. Dik <Casper.Dik@OrSPaMcle.COM> - 2013-05-24 16:47 +0000
                Re: wpad.dat attack on Linux Apache server Sandman <mr@sandman.net> - 2013-05-24 18:53 +0200
                Re: wpad.dat attack on Linux Apache server J G Miller <miller@yoyo.ORG> - 2013-05-24 17:15 +0000
                Re: wpad.dat attack on Linux Apache server Sandman <mr@sandman.net> - 2013-05-24 21:20 +0200
                Re: wpad.dat attack on Linux Apache server Richard Kettlewell <rjk@greenend.org.uk> - 2013-05-25 08:45 +0100
                Re: wpad.dat attack on Linux Apache server Sandman <mr@sandman.net> - 2013-05-25 09:54 +0200
                Re: wpad.dat attack on Linux Apache server Sandman <mr@sandman.net> - 2013-05-25 10:04 +0200
                Re: wpad.dat attack on Linux Apache server Casper H.S. Dik <Casper.Dik@OrSPaMcle.COM> - 2013-05-26 10:12 +0000
                Re: wpad.dat attack on Linux Apache server "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2013-05-24 13:50 -0400
                Re: wpad.dat attack on Linux Apache server Richard Kettlewell <rjk@greenend.org.uk> - 2013-05-24 19:10 +0100
                Re: wpad.dat attack on Linux Apache server Richard Kettlewell <rjk@greenend.org.uk> - 2013-05-24 19:15 +0100
                Re: wpad.dat attack on Linux Apache server Sandman <mr@sandman.net> - 2013-05-24 21:33 +0200
                Re: wpad.dat attack on Linux Apache server Richard Kettlewell <rjk@greenend.org.uk> - 2013-05-25 08:38 +0100
                Re: wpad.dat attack on Linux Apache server Sandman <mr@sandman.net> - 2013-05-24 21:25 +0200
                Re: wpad.dat attack on Linux Apache server Whiskers <catwheezel@operamail.com> - 2013-05-25 15:52 +0100
                Re: wpad.dat attack on Linux Apache server Roger <invalid@invalid.invalid> - 2013-05-25 17:19 +0100
                Re: wpad.dat attack on Linux Apache server J G Miller <miller@yoyo.ORG> - 2013-05-25 17:22 +0000
                Re: wpad.dat attack on Linux Apache server Sandman <mr@sandman.net> - 2013-05-25 19:41 +0200
              Re: wpad.dat attack on Linux Apache server Chris Davies <chris-usenet@roaima.co.uk> - 2013-05-24 12:31 +0100
                Re: wpad.dat attack on Linux Apache server Sandman <mr@sandman.net> - 2013-05-24 14:29 +0200
                Re: wpad.dat attack on Linux Apache server Chris Davies <chris-usenet@roaima.co.uk> - 2013-05-24 23:45 +0100
  Re: wpad.dat attack on Linux Apache server Sandman <mr@sandman.net> - 2013-05-24 14:49 +0200

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