full-disclosure - [FD] Stored XSS in Salutation Responsive WordPress + BuddyPress Theme could allow logged-in users to do almost anything an admin can (WordPress plugin)

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Message-ID: <9e0e8eefeed61d8dc51716c6689bd5e4@security.dxw.com>
Date: Mon, 31 Jul 2017 14:49:19 +0000
From: dxw Security <security@....com>
To: fulldisclosure@...lists.org
Subject: [FD] Stored XSS in Salutation Responsive WordPress + BuddyPress
	Theme could allow logged-in users to do almost anything an
	admin can (WordPress plugin)

Details
================
Software: Salutation Responsive WordPress + BuddyPress Theme
Version: 3.0.15
Homepage: https://themeforest.net/item/salutation-responsive-wordpress-buddypress-theme/548199
Advisory report: https://security.dxw.com/advisories/stored-xss-salutation-theme/
CVE: Awaiting assignment
CVSS: 4.9 (Medium; AV:N/AC:M/Au:S/C:P/I:P/A:N)

Description
================
Stored XSS in Salutation Responsive WordPress + BuddyPress Theme could allow logged-in users to do almost anything an admin can

Vulnerability
================
The theme contains JavaScript (assets/js/onLoad.js) which iterates through .section-tabs a and puts every href value it finds into jQuery(). jQuery() doesn’t just search for elements which match a selector (i.e. jQuery(\'.section-tabs\')), it also creates elements (i.e. jQuery(\'<div>\')).
$(\'.section-tabs\').simpleSlideTop();

// ...

$.fn.simpleSlideTop = function(opts) {

    // ...

    contentID = $(this).attr(\'href\');

    $(contentID).hide();
An attacker without the unfiltered_html capability would be able to inject arbitrary HTML as if they had the unfiltered_html capability. With the ability to inject arbitrary HTML, the attacker is able add JavaScript which causes a logged-in administrator user to do almost anything – including creating new user accounts, deleting posts, and more.

Proof of concept
================

Click the activate button on the theme
Install and activate Revolution Slider plugin
Create a new user with role of Author (by default, Authors do not possess the unfiltered_html capability)
Log in as that user
Visit “Add New Post” screen
Switch the editor to “Text” mode
Enter the following: <div class=\"section-tabs\"><a href=\"&lt;img src=x onerror=alert(1)&gt;\">a</a></div>
Press “Publish”
Press “View post”
You will see an alertbox appear showing the value “1”

For comparison, if the same user account enters <img src=x onerror=alert(1)> or <script>alert(1)</script>, it will be blocked by WordPress.

Mitigations
================
Upgrade to version 3.0.16 or later.

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
================

2017-04-26: Discovered
2017-07-25: Reported via contact form on http://para.llel.us/
2017-07-25: Vendor reported issue fixed in 3.0.16
2017-07-31: Advisory published

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

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