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;Attachment:
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