full-disclosure - Re: Apache Killer

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Message-ID: <CALCvwp5sVbJEqpNTR8kx+K29k0=J3YxAq0ZVr4Rbzy8-gZNy1w@mail.gmail.com>
Date: Wed, 24 Aug 2011 18:24:20 +1000
From: "-= Glowing Sex =-" <doomxd@...il.com>
To: Davide Guerri <davide.guerri@...il.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Apache Killer

Ciao davide,
Very nice , thanks for the submittal and thoughts regarding thisissue, all
of it is handy..
Only problem with these patches, unless you look at the advisory/and or
patch and see exactly what needs to be filteed, only then maybe can have a
really tough regex, wich btw would be VERY cool and handy.!
Good line of thinking anyhow. Props.
xd


On 24 August 2011 18:03, Davide Guerri <davide.guerri@...il.com> wrote:

> 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.
>
>
> On 24/ago/2011, at 08:01, -= Glowing Sex =- wrote:
>
> > This is handy to read for anyone who runs apache... its worth a look...
> thx kcope ;>
> > xd
> >
> >
> > On 24 August 2011 13:26, HI-TECH . <
> isowarez.isowarez.isowarez@...glemail.com> wrote:
> > Hello list,
> > oops looks like this bug has nothing to do with mod_deflate/mod_gzip,
> > read on here where the apache team is resolving the issue:
> >
> > http://www.gossamer-threads.com/lists/apache/dev/401638
> >
> > Cheers,
> >
> > Kingcope
> >
> > 2011/8/20 Moritz Naumann <security@...itz-naumann.com>:
> > > On 20.08.2011 00:23 HI-TECH . wrote:
> > >> (see attachment)
> > >> /Kingcope
> > >
> > > Works (too) well here. Are there any workarounds other than rate
> > > limiting or detecting + dropping the traffic IPS-wise?
> > >
> > > Moritz
> > >
> >
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