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

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Message-ID: <4E57B7CB.2080404@oldum.net>
Date: Fri, 26 Aug 2011 18:12:11 +0300
From: Nikolay Kichukov <hijacker@...um.net>
To: bodik <bodik@....zcu.cz>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Advisory: Range header DoS vulnerability
 Apache HTTPD 1.3/2.x (CVE-2011-3192)

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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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Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
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