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Wednesday, December 14, 2016

[FD] Reflected XSS in MailChimp for WordPress could allow an attacker to do almost anything an admin user can (WordPress plugin)

Details ================ Software: MailChimp for WordPress Version: 3.1.5,4.0.10 Homepage: http://ift.tt/1bflr5u Advisory report: http://ift.tt/2hkUvfE CVE: Awaiting assignment CVSS: 5.8 (Medium; AV:N/AC:M/Au:N/C:P/I:P/A:N) Description ================ Reflected XSS in MailChimp for WordPress could allow an attacker to do almost anything an admin user can Vulnerability ================ If an attacker can trick a logged-in admin user into visiting a particular URL, they can execute JavaScript in the user’s browser which can perform almost any action that the user can. Proof of concept ================ Assuming you have the site running on http://localhost/ with the plugin activated, visit this URL in a browser without reflected XSS mitigation measures (i.e. Firefox): http://localhost/wp-admin/admin.php?page=mailchimp-for-wp-integrations&integration=%3Cscript%3Ealert%281%29%3C%2Fscript%3E Mitigations ================ Update to version 4.0.11 or later. Disclosure policy ================ dxw believes in responsible disclosure. Your attention is drawn to our disclosure policy: http://ift.tt/1B6NWzd 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 ================ 2016-03-23: Discovered 2016-12-07: Reported to support@ibericode.com 2016-12-07: Requested CVE 2016-12-07: Vendor first replied 2016-12-09: Vendor reported fixed in 4.0.11 2016-12-13: Advisory published Discovered by dxw: ================ Tom Adams Please visit security.dxw.com for more information.

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