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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: Fri, 24 May 2013 18:53:39 +0200
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In article <519f999f$0$15903$e4fe514c@news2.news.xs4all.nl>,
 Casper H.S. Dik <Casper.Dik@OrSPaMcle.COM> wrote:

> >> host www.stadsnat.se
> >www.stadsnat.se is an alias for cluster.atlascms.se.
> >cluster.atlascms.se has address 94.247.170.170
> 
> >Now, atlascms.se WAS a wildcard DNS, but isn't any longer.
> 
> So when someone looked up wpad.stadsnet.se it was mapped
> to cluster.atlascms.se?  That, I think, is the root
> of your problem.

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).

I only know of one client that has wildcard:ed their DNS to me, 
actually. Maybe I should tell them to exempt wpad...

> >Even so, the requests I get look largely like this:
> 
> >94.254.41.78 cluster.atlascms.se - [24/May/2013:16:25:24 +0200] "GET 
> >/wpad.dat HTTP/1.1" 200 70 "-" "Mozilla/5.0 (compatible; MSIE 10.0; 
> >Win32; Trident/6.0)"
> 
> >I.e. a request to that domain name, not to a wpad subdomain. So the 
> >wildcard DNS thing doesn't seem to even apply... Or am I mistaken?
> 
> I wouldn't be too sure about that.  Note that wpad/wpad.dat is looked
> with a different algorithm then ordinary websites because it needs
> to sidestep the proxies and such.





-- 
Sandman[.net]