[wp-hackers] CSRF vulnerability in WP HTML Sitemap 1.2 (WordPress plugin)

[Daniel Bachhuber]

Hi Harry,

Please refrain from advertising on this list. Plugin security issues should
be reported to plugins at wordpress.org

Thanks.


On Fri, Mar 28, 2014 at 5:39 AM, Harry Metcalfe <harry at dxw.com> wrote:

> 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 at dxw.com to acknowledge this report if you
> received it via a third party (for example, plugins at 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.
>
>
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