Details
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Software: iframe
Version: 3.0
Homepage: https://wordpress.org/plugins/iframe/
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)

Description
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Reflected XSS in iframe allows unauthenticated users to do almost anything an admin can

Vulnerability
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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
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Paste the following into a post:
[iframe src=\"https://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:
https://localhost/2015/07/31/iframe/?a=%22%3E%3C/iframe%3E%3Cscript%3Ealert(`hello%20world`)%3C/script%3E

Mitigations
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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.

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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2015-07-31: Discovered
2015-08-05: Reported to vendor via web form on https://web-profile.com.ua/feedback/
2015-08-06: Vendor responded
2015-08-10: Vendor reported fixed in version 4.0
2015-08-10: Published



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