Re: Advisory: Range header DoS vulnerability Apache HTTPD 1.3/2.x (CVE-2011-3192)

[Nikolay Kichukov <hijacker () oldum net>]

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Hi,
This one works like charm on my debian stable

LimitRequestFieldSize 200


in the apache2.conf as global directive for all vhosts.

Cheers,
- -Nik

On 08/26/2011 05:56 PM, bodik wrote:
> Dne 08/26/11 13:26, bodik napsal(a):
> > > > Option 2: (Pre 2.2 and 1.3)
> > > >
> > > > # Reject request when more than 5 ranges in the Range: header. #
> > > > CVE-2011-3192 # RewriteEngine on RewriteCond %{HTTP:range}
> > > > !(bytes=[^,]+(,[^,]+){0,4}$|^$) # RewriteCond %{HTTP:request-range}
> > > > !(bytes=[^,]+(?:,[^,]+){0,4}$|^$) RewriteRule .* - [F]
> > > ^^ Better use this:
> > >
> > > RewriteEngine on RewriteCond %{HTTP:range} !(^bytes=[^,]+(,[^,]+){0,4}$|^$)
> > > [NC,OR] RewriteCond %{HTTP:request-range} !(^bytes=[^,]+(,[^,]+){0,4}$|^$)
> > > [NC] RewriteRule .* - [F]
> >
> > in any case, i found very wierd behavior on some of our webservers. as we
> > applied the first version of workaround, something about 15% of our webpages
> > seems to be broken, but the rest of virtual hosts were working fine.
>
> because of messing with Options FollowSymLinks or SymLinksIfOwnerMatch and
> mod_rewrite i have to implement other workaround ..
>
> b
>
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