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All in One SEO Pack Plugin for WordPress - 2.0.3 XSS
From: Charlie Briggs <charlie () cysha co uk>
Date: Wed, 2 Oct 2013 16:04:44 +0100


Vendor: Semper Fi Web Design (http://semperfiwebdesign.com/)

Software: All in One SEO Pack

Developer: Michael Torbert (http://michaeltorbert.com/)

Product URL: http://wordpress.org/plugins/all-in-one-seo-pack/

Changelog: http://semperfiwebdesign.com/blog/all-in-one-seo-pack/all-in-one-seo-pack-release-history/

Vulnerability type: Reflected Cross-Site Scripting (XSS)

Vulnerable versions:
    1.x branch: -

    2.x branch:
        2.0 - 2.0.3

Fixed in:

Credit: Charlie Briggs / Richard Clifford


Advisory details:

Semper Fi Web Design's WordPress plugin, All in One SEO Pack
introduced the use of PHP function stripcslashes() on the search
string in version, this was continually used in each version
up until the latest (

The use of stripcslashes() means that an encoded payload in the search
parameter, forming a request of:


Would lead to the following output:

This can also be used as an attack vector for the remote code
execution vulnerabilities in vulnerable versions of the caching
plugins W3 Total Cache and WP Super Cache.


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