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

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Date: Fri, 26 Aug 2011 16:56:43 +0200
From: bodik <bodik@....zcu.cz>
To: full-disclosure@...ts.grok.org.uk
Subject: Re: Advisory: Range header DoS vulnerability
 Apache HTTPD 1.3/2.x (CVE-2011-3192)

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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