full-disclosure - Re: Apache Killer

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Message-Id: <E241637C-93D6-4E08-8E00-2DED60E47CAB@gmail.com>
Date: Wed, 24 Aug 2011 11:04:13 +0200
From: Davide Guerri <davide.guerri@...il.com>
To: -= Glowing Sex =- <doomxd@...il.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Apache Killer

Hi Sex (lol, weird thing to say),
I agree with you. 
Moreover, this kind of filtering likely can't be used as-is for every apache installation. 

However, it will hopefully prevent kiddies to pwn our web servers. :)

Cheers,
 Davide.


On 24/ago/2011, at 10:24, -= Glowing Sex =- wrote:

> 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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