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WordPress Member Approval Cross Site Request Forgery

WordPress Member Approval Cross Site Request Forgery
Posted Jun 10, 2014
Authored by Tom Adams

WordPress Member Approval plugin suffers from a cross site request forgery vulnerability.

tags | exploit, csrf
advisories | CVE-2014-3850
SHA-256 | cf0e211277b3af8f29f890eaee047abd87d67ab49da7b4f8644f2926c3e15974

WordPress Member Approval Cross Site Request Forgery

Change Mirror Download
Details
================
Software: Member Approval
Version: 131109
Homepage: http://wordpress.org/plugins/member-approval/
Advisory ID: dxw-1970-1172
CVE: CVE-2014-3850
CVSS: 5.8 (Medium; AV:N/AC:M/Au:N/C:P/I:P/A:N)

Description
================
CSRF in Member Approval 131109 permits unapproved registrations

Vulnerability
================
By convincing a logged-in administrator to visit a link of an attacker’s choosing an attacker can reset the plugin’s options to the defaults, meaning that registrations will become open to everybody without requiring approval.

Proof of concept
================
By clicking the submit button here, an admin will reset the plugin to the defaults (with some slight modifications there may be a stored XSS here too, but I did not investigate further):
<form method=\"post\" action=\"http://localhost/wp-admin/options-general.php?page=member-approval\">
<input type=\"submit\">
</form>

Note: no admin action is necessary assuming the attacker can persuade an admin to visit a page under their control, as the form can be submitted using Javascript.

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 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.

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

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

2014-04-08: Discovered
2014-04-10: Reported to plugins@wordpress.org
2014-06-10: No response from author. Published.

Discovered by dxw:
================
Tom Adams
=======

Discovered by dxw:
================
Tom Adams

Please visit security.dxw.com for more information.




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