Reporter Tom Adams
Advisory report: https://security.dxw.com/advisories/reflected-xss-in-iframe-allows-unauthenticated-users-to-do-almost-anything-an-admin-can/
CVE: Awaiting assignment
CVSS: 5.8 (Medium; AV:N/AC:M/Au:N/C:P/I:P/A:N)
Reflected XSS in iframe allows unauthenticated users to do almost anything an admin can
If the “get_params_from_url” option is used in the iframe shortcode, the page/post it’s on is opened up to a reflected XSS attack.
Proof of concept
Paste the following into a post:
[iframe src=\"http://www.youtube.com/embed/4qsGTXLnmKs\" width=\"100%\" height=\"500\" get_params_from_url=\"1\"]
Visit the post in a browser that doesn’t attempt to mitigate XSS attacks (i.e. Firefox) and add some extra parameters:
Upgrade to version 4.0 or later
If this is not possible, ensure that the ‘get_params_from_url’ argument is never used in the shortcode.
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This vulnerability will be published if we do not receive a response to this report with 14 days.
2015-08-05: Reported to vendor via web form on http://web-profile.com.ua/feedback/
2015-08-06: Vendor responded
2015-08-10: Vendor reported fixed in version 4.0
Discovered by dxw:
Please visit security.dxw.com for more information.