WordPress YouTube Embed 3.3.2 Cross Site Scripting

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Details  
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Software: YouTube Embed  
Version: 3.3.2  
Homepage: https://wordpress.org/plugins/youtube-embed/  
CVE ID: CVE-2015-6535 (Pending)  
CWE ID: CWE-79  
CVSS: 5.5 (Medium; AV:N/AC:L/Au:S/C:P/I:P/A:N)  
  
Description  
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A stored XSS vulnerability in YouTube Embed 3.3.2 (and possibly earlier versions) allows admin users to compromise other admins and super admins.   
  
YouTube Embed is a WordPress plugin with over 30,000 active installs.  
  
Vulnerability  
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Admins on multisite installs can inject arbitrary JavaScript into pages visible to super admins via the plugin's unsanitized profile name field.   
  
Note: Admins on multisite installs lack the unfiltered_html capability – only super admins can enter unfiltered html [2].  
  
>From youtube-embed/includes/options-profiles.php:  
  
31: $options[ 'name' ] = $_POST[ 'youtube_embed_name' ];  
  
95: echo '<div class="updated fade"><p><strong>' . __( $options[ 'name' ].' Profile Saved.' ) . "</strong></p></div>\n";  
  
Proof of concept  
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1. As an admin user authorized for plugins, go to the YouTube Embed Profiles page.  
2. Choose a profile from the drop down list on the right and click 'Change profile'.  
3. Enter an XSS payload (e.g. <script>alert(1)</script>) into the 'Profile name' field.  
4. Log out and log in as a super admin or a different admin.  
5. Navigate to the YouTube Embed Options page.  
  
This has been tested with Firefox 38.2.0 on Debian.  
  
Mitigation  
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Upgrade the plugin to version 3.3.3 or later.  
  
Timeline  
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2015-08-19: Discovered  
2015-08-19: Requested vulnerability reporting instructions via vendor support form  
2015-08-20: Vendor asked that vulnerability be reported on the vendor's website plugin page  
2015-08-20: Reported to vendor via plugin page  
2015-08-20: Requested CVE number  
2015-08-23: Vendor released version 3.3.3 – confirmed fixed  
2015-08-26: Public Disclosure  
  
References  
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[1] https://wordpress.org/plugins/youtube-embed/changelog/  
[2] https://codex.wordpress.org/Roles_and_Capabilities#Additional_Admin_Capabilities  
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