bugtraq - Re: WordPress 3.5.1, Denial of Service

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Date: Thu, 13 Jun 2013 09:34:18 +0300
From: Henri Salo <henri@...v.fi>
To: Krzysztof Katowicz-Kowalewski <vnd@...h.net>
Cc: bugtraq@...urityfocus.com
Subject: Re: WordPress 3.5.1, Denial of Service

On Fri, Jun 07, 2013 at 06:29:48PM +0200, Krzysztof Katowicz-Kowalewski wrote:
> Version 3.5.1 (latest) of popular blogging engine WordPress suffers from remote denial of service vulnerability. The bug exists in encryption module (class-phpass.php). The exploitation of this vulnerability is possible only when at least one post is protected by a password.
> 
> Time frames:
> 31.05.2013 WordPress security team has been informed about the vulnerability (no response).
> 07.06.2013 The vulnerability has been released to the public.
> 
> More information (including proof of concept):
> https://vndh.net/note:wordpress-351-denial-service
> 
> A way out (before official WordPress update) to secure existing installations is to apply the following patch:
> 
> --- wp-includes/class-phpass.php
> +++ wp-includes/class-phpass.php
> @@ -120,7 +120,7 @@
>  			return $output;
>  
>  		$count_log2 = strpos($this->itoa64, $setting[3]);
> -		if ($count_log2 < 7 || $count_log2 > 30)
> +		if ($count_log2 < 7 || $count_log2 > 13)
>  			return $output;
>  
>  		$count = 1 << $count_log2;

Please use CVE-2013-2173 for this issue.

---
Henri Salo

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