Re: Apache Killer

[Jari Fredriksson <jarif () iki fi>]

24.8.2011 12:36, Davide Guerri kirjoitti:
> Hi Jari,
> I have it working here on ubuntu 10.04.3 LTS.
>
> Please be sure you've mod_rewrite enabled and that you've added the rewrite rules to the virtualhost you want to 
> protect from the DoS.
> Mod_rewrite rules can't be used system-wide (although it's possible for a virtualhost to inherit main any rules 
> specified in the main apache configuration file).

Thanks, that worked! :)


> To debug you can use the following directives
>
> > RewriteLog /var/log/apache2/rewrite.log
> > RewriteLogLevel 3
>
> On matching log file should contain something like 
>
> <server IP> - - [24/Aug/2011:11:09:58 +0200] [<client IP>/sid#7f0c9cb3f098][rid#7f0c9cb95d58/subreq] (1) pass through 
> /index.html
> <server IP> - - [24/Aug/2011:11:09:58 +0200] [<client IP>/sid#7f0c9cb3f098][rid#7f0c9cbac148/initial] (2) init 
> rewrite engine with requested uri /
> <server IP> - - [24/Aug/2011:11:09:58 +0200] [<client IP>/sid#7f0c9cb3f098][rid#7f0c9cbac148/initial] (3) applying 
> pattern '.*' to uri '/'
>
> Cheers,
>  Davide.
>
> On 24/ago/2011, at 11:02, Jari Fredriksson wrote:
>
> > 24.8.2011 11:03, Davide Guerri kirjoitti:
> > > While waiting for an official patch, how about the following workaround?
> > >
> > > > RewriteEngine On
> > > > RewriteCond %{REQUEST_METHOD} ^(HEAD|GET) [NC]
> > > > RewriteCond %{HTTP:Range} ([0-9]*-[0-9]*)(\s*,\s*[0-9]*-[0-9]*)+
> > > > RewriteRule .* - [F]
> > >
> > >
> > > The workaround uses modrewrite to forbid get|head requests with multiple ranges in the Range HTTP header.
> > > The second regex could be improved but it works for the exploit released so far...
> > >
> > > Cheers,
> > > Davide.
> >
> > Did not help here. Debian Squeeze with its Apache.


-- 

He was part of my dream, of course -- but then I was part of his dream too.
                -- Lewis Carroll

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