full-disclosure - Re: Apache Killer

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Message-ID: <CANAqkQ-k6p+zBH_vyjLZ_ai4uFymtO5F4XwVbPrJAgS8GRtdSQ@mail.gmail.com>
Date: Wed, 24 Aug 2011 10:23:40 -0400
From: ZOne <zone2kz@...il.com>
To: full-disclosure@...ts.grok.org.uk
Subject: Re: Apache Killer

For those using Snort, a local snort rule to alert for incoming attacks
might help while waiting for a patch.

example:

alert tcp $EXTERNAL_NET any -> any 80 (msg:"INBOUND Apache Killer script:
Local web server is under attack."; content:"Range:bytes=0-"; classtype:
denial-of-service; threshold: type threshold, track by_src, count 5 ,
seconds 20; sid:3000005;)



On Wed, Aug 24, 2011 at 4:03 AM, 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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