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

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Message-Id: <8AB094FC-738B-47D9-BEAE-192B01052ACB@webweaving.org>
Date: Fri, 26 Aug 2011 12:34:13 +0100
From: Dirk-Willem van Gulik <dirkx@...weaving.org>
To: Carlos Alberto Lopez Perez <clopez@...lia.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Advisory: Range header DoS vulnerability
	Apache HTTPD 1.3/2.x (CVE-2011-3192)


On 26 Aug 2011, at 12:09, Carlos Alberto Lopez Perez wrote:
> RewriteEngine on
> RewriteCond %{HTTP:range} !(^bytes=[^,]+(,[^,]+){0,4}$|^$) [NC,OR]
> RewriteCond %{HTTP:request-range} !(^bytes=[^,]+(,[^,]+){0,4}$|^$) [NC]
> RewriteRule .* - [F]
> 
> Because if you don't specify the [OR] apache will combine the rules
> making an AND (and you don't want this!).
> 
> Also use NC=(nocase) to prevent the attacker upper casing "bytes="
> (don't know if it will work.. but just to prevent)

Thank you - will double check & add in next/final advisory.

Dw.

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