vBulletin has notified their users about possible vulnerability in vBSEO plugin.
vBSEO is no longer developed and maintained. Hence there will be no security update available for this. Following was the official email from vBullein:
Dear VB License Holder,
It has come to our attention that there may be a potential security vulnerability in VBSEO affecting the latest version of the software (and potentially other versions as well). We’ve attempted to contact the vendor, but as they have been non-responsive we felt we should alert the community as many of our customers use this add-on software.
If you think you might be running a vulnerable version of the software, there is a simple fix: just comment out the following lines in the file vbseo/includes/functions_vbseo_hook.php:
if(isset($_REQUEST[‘ajax’]) && isset($_SERVER[‘HTTP_REFERER’]))
$permalinkurl = $_SERVER[‘HTTP_REFERER’].$permalinkurl;
should be changed to:
// if(isset($_REQUEST[‘ajax’]) && isset($_SERVER[‘HTTP_REFERER’]))
// $permalinkurl = $_SERVER[‘HTTP_REFERER’].$permalinkurl;
If you are running the “Suspect File Versions” diagnostics tool, you will additionally need to generate a new MD5 sum of the above file and edit upload/includes/md5_sums_crawlability_vbseo.php to use the new MD5 sum on the line:
Please be aware that you are making these changes at your own risk. We don’t know if making this change affects the terms of your VBSEO license and we can’t be responsible if making this change breaks your site.
CVE-2014-9463 has been assigned to this potential vulnerability by cve.mitre.org.
The vBulletin Team