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WordPress iframe 3.0 Stored Cross Site Scripting

WordPress iframe 3.0 Stored Cross Site Scripting
Posted Aug 10, 2015
Authored by Tom Adams

WordPress iframe plugin version 3.0 suffers from a stored cross site scripting vulnerability.

tags | exploit, xss
SHA-256 | e1c0096846f05588c5c54423834ef3075b290b167dc1dac3c8e73c3ca44a1706

WordPress iframe 3.0 Stored Cross Site Scripting

Change Mirror Download
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 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
================

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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