BugTraq
WordPress 3.5.1, Denial of Service Jun 07 2013 04:29PM
Krzysztof Katowicz-Kowalewski (vnd vndh net) (2 replies)
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;-----BEGIN PGP SIGNATURE-----
Version: GnuPG/MacGPG2 v2.0.19 (Darwin)

iQIcBAEBCgAGBQJRsgp8AAoJEEJGP6nEM7RcGY8P/iV6Tj9Ll99zb/Sz/JIMB9Hy
+vBHRp5IDLXQP9BzHfcryEQrKhCQW2Z2Elqm5d2pdH239CNTBrPMpHAo7GaNIeb4
8oaVcMOl0YAMJqm1xx/mzQeJ64WH4SyKZStz81K+0hNqN0Vq1pCsJMCHlXiCYDDj
jmS/K78w6sbTf+u1X0sy7DLDYdsUQSW1ZbTp7PHh0P0ONw0VD7drbNlkiJzISnTc
eUe/noQd6gcPQyg9zhuvMrl2NH2f+pWIokPGXuAdVS/AUBRl/TiS7SAWm7PpzbWr
FbSEhwmQ2fpQGGLnFJpvoJVaVGtiTXN/SS9R4viwWWUJMRHNpBBs51hFbbHYZDZt
Jfa1Yewp+KeXUgMQzJGxxgd+ireHkI/yNW0g3g+Rf+mKR/9wecbCaQibjUndyMSi
w36ynrbvjq/sWxm0WfSojMU8M+Uro1fYoq1ZA0FR2Je9E8d7SWN4KRYxKJeA3/PX
XgEKlLSLbBjOoig0ElJmTnGy/78ZK4n0AQJlPzzflDnfK3+VBpxi26hUhz+xRK37
EDb+ZJlP8dhz8t94kJx0xZ9ZQauMEro8SCAaSctFUhn4IVMbNdq09wwzNzLIGc2D
X2iAP2sO1FXJqLA955PXLQzCB1F5NbzZIqNb1HuuLbMB+zmfwfOoZ+a0iQQcaK6a
Pf0FRQYqleJZCzH4s62Z
=jSm+
-----END PGP SIGNATURE-----

[ reply ]
Re: WordPress 3.5.1, Denial of Service Jun 13 2013 06:34AM
Henri Salo (henri nerv fi)
Re: WordPress 3.5.1, Denial of Service Jun 11 2013 06:55PM
Peter Bex (Peter Bex xs4all nl) (1 replies)
Re: WordPress 3.5.1, Denial of Service Jun 11 2013 11:02PM
Solar Designer (solar openwall com)


 

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