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

[Dirk-Willem van Gulik <dirkx () webweaving org>]

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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