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On Fri, Jun 07, 2013 at 06:29:48PM +0200, Krzysztof Katowicz-Kowalewski wro=
te:
> 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 onl=
y when at least one post is protected by a password.
>=20
> Time frames:
> 31.05.2013 WordPress security team has been informed about the vulnerabil=
ity (no response).
> 07.06.2013 The vulnerability has been released to the public.
>=20
> More information (including proof of concept):
> https://vndh.net/note:wordpress-351-denial-service
>=20
> A way out (before official WordPress update) to secure existing installat=
ions is to apply the following patch:
>=20
> --- wp-includes/class-phpass.php
> +++ wp-includes/class-phpass.php
> @@ -120,7 +120,7 @@
> return $output;
> =20
> $count_log2 =3D strpos($this->itoa64, $setting[3]);
> - if ($count_log2 < 7 || $count_log2 > 30)
> + if ($count_log2 < 7 || $count_log2 > 13)
> return $output;
> =20
> $count =3D 1 << $count_log2;
Please use CVE-2013-2173 for this issue.
---
Henri Salo
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