Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.os.linux.networking > #2159

Re: wpad.dat attack on Linux Apache server

Cross-posted to 3 groups.

Show all headers | View raw

In article <kno77s$78m$2@dont-email.me>, J G Miller <miller@yoyo.ORG> 
wrote:

> > No, that's the thing - "stadsnat.se" is not a domain I am 
> > administering. It's one of my clients domains. They wouldn't wildcard 
> > DNS and send ALL requests to me - only web requests (so www would 
> > point to me).
> 
> Did you read this article?
> 
> <https://nodpi.ORG/2013/05/09/wpad-the-internet-explorer-security-flaw-that-ex
> poses-all-microsoft-users-in-the-uk/>

Not that one specifically, but I have read about the point he is 
making.

> According to that article all Microsoft Internet Explorer users in 
> the UKofGB&NI are being directed by default towards a site run by a 
> Brazilian, which obviously is not their DNS provider.

Which is due to UK citizens usually having a two part top level domain 
name. WPAD see's the domain "domain.co.uk" and thinks (correctly, one 
might add) that "domain" is a subdomain to "co" which is the local 
domain to the top level "uk". Which means that "wpad.co.uk" is a 
logical assumption for this function.

This is not relevant to atlascms.se or any of swedish domains, really 
(we did have the pp.se domain thing for private person, but that was a 
decade ago). 

> QUOTE
> 
>   Sadly WPAD has some serious flaws. In particular, if DHCP discovery
>   fails… WPAD reverts to a crude search for a source of configuration
>   using DNS.
> 
>   In Windows, this search appears to be governed by the 
> 
>   *DNS suffixes used to resolve unqualified domain names*
> 
>  (see the Advanced TCP/IP Settings dialog, right).
>       
> 
> UNQUOTE
> 
> Perhaps you appearing as wpad.yourdomain.se because of the above (and maybe
> repeated combinations thereof because of your wild card setup) and so every
> MSIE from your clients tries that in its crude attempts to find
> the wpad proxy info?

The only one of my clients that have wildcard:ed their domain to me is 
opennet.se, I'll have a talk to them. As far as I know, they don't 
have almost 5000 users on their LAN though. 

because even if what you postulate is a possible scenario, it would 
under no circumstances generate hundreds of thousands of requests - 
sometimes 30-40 per second from one single host. That's where the 
entire "misconfigured DNS" idea falls slightly apart, don't you agree?

I mean, if I came here wondering about these wpad.dat requests I see 
now and then, then that would be a logical question. But I get about 
20-30 requests per second, every second. That just can't be due to a 
misconfigured wildcard DNS.

Or do you think I am jumping to conclusions?



-- 
Sandman[.net]

Back to comp.os.linux.networking | Previous | Next — Previous in thread | Next in thread | Find similar

Thread

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
  Re: wpad.dat attack on Linux Apache server jcharth@gmail.com - 2013-05-28 12:45 -0700

csiph-web