[FD] Reflected XSS in iframe allows unauthenticated users to do almost anything an admin can (WordPress plugin)

[dxw Security <security@xxxxxxx>]

Details
================
Software: iframe
Version: 3.0
Homepage: http://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
================
Reflected XSS in iframe allows unauthenticated users to do almost anything an 
admin can

Vulnerability
================
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:
http://localhost/2015/07/31/iframe/?a=%22%3E%3C/iframe%3E%3Cscript%3Ealert(`hello%20world`)%3C/script%3E

Mitigations
================
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
================
dxw believes in responsible disclosure. Your attention is drawn to our 
disclosure policy: https://security.dxw.com/disclosure/

Please contact us on security@xxxxxxx to acknowledge this report if you 
received it via a third party (for example, plugins@xxxxxxxxxxxxx) 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
================

2015-07-31: Discovered
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
2015-08-10: Published



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


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