WordPress iframe 3.0 Stored Cross Site Scripting

`Details  
================  
Software: iframe  
Version: 3.0  
Homepage: http://wordpress.org/plugins/iframe/  
Advisory report: https://security.dxw.com/advisories/stored-xss-in-iframe-allows-less-privileged-users-to-do-almost-anything-an-admin-can/  
CVE: Awaiting assignment  
CVSS: 5.5 (Medium; AV:N/AC:L/Au:S/C:P/I:P/A:N)  
  
Description  
================  
Stored XSS in iframe allows less privileged users to do almost anything an admin can  
  
Vulnerability  
================  
Users without the unfiltered_html capability are able to insert arbitrary HTML into pages and thus exceed the privileges they were granted.  
  
Proof of concept  
================  
Insert the following into a post:  
[iframe src=\"http://www.youtube.com/embed/4qsGTXLnmKs\" width=\"100%\" height=\"500\" onload=\"alert(1)\"]  
  
Mitigations  
================  
Disable the plugin until a new version is released that fixes this bug.  
The vendor has released version 4.0 in which onload is disabled, but the other ‘event’ attributes are still permitted, including onpageshow. A number of these event attributes could be used to execute this attack, so this issue is not resolved.  
  
Disclosure policy  
================  
dxw believes in responsible disclosure. Your attention is drawn to our disclosure policy: https://security.dxw.com/disclosure/  
  
Please contact us on [email protected] to acknowledge this report if you received it via a third party (for example, [email protected]) 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 but this does not address the issue: the plugin is still vulnerable.  
2015-08-10: Published  
  
  
  
Discovered by dxw:  
================  
Tom Adams  
Please visit security.dxw.com for more information.  
  
  
  
  
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