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Date: Sun, 21 Jun 2015 11:59:19 -0400 (EDT)
From: cve-assign@...re.org
To: sec@...entropy.us
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com
Subject: Re: Yoast Wordpress SEO Plugin <= 2.1.1 Stored, Authenticated XSS

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> https://inventropy.us/blog/yoast-seo-plugin-cross-site-scripting-vulnerability/
> https://wordpress.org/plugins/wordpress-seo/changelog/

See http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-6692 for
the XSS issue related to the "everyone can make a post. This post is
then validate by an admin user. So everyone can use the security
breach to execute javascript in admin" threat model on the
https://wordpress.org/support/topic/security-issue-with-post-title-field-xss-vulnerability
page from 2012-10-31.

It appears that the outcome is that the XSS payload is stored and then
immediately reflected. Probably the highest risk is from the stored
XSS, but the reflected aspect is also relevant if the admin encounters
a malicious web site while logged into WordPress.

However, that 2012-10-31 page also says:

  - connect you on admin of your site
  - go to url : [www.yoursite.com]/wp-admin/post-new.php?post_title=<script>alert('There is a problem');</script>
  - The alert message is displaying !
  
  => CSRF : http://en.wikipedia.org/wiki/Cross-site_request_forgery

Is (or was) there a separate CSRF vulnerability, of interest to an
attacker who wants to make a post (without any XSS payload) with the
admin's credentials?


Finally, you mentioned:

> the plugin author said that it had already been patched at the time.

>> This was already patched in 1.3

Apparently this refers to:

  http://plugins.svn.wordpress.org/wordpress-seo/trunk/changelog.txt

  = 1.3 =

  * Long list of small fixes and improvements to code best practices
  after Sucuri review. Fixes 3 small security issues.

We don't know whether there was an earlier incomplete fix to the
metabox functionality, so we aren't currently assigning a different
CVE ID for versions before 1.3.

- -- 
CVE assignment team, MITRE CVE Numbering Authority
M/S M300
202 Burlington Road, Bedford, MA 01730 USA
[ PGP key available through http://cve.mitre.org/cve/request_id.html ]
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