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WordPress 404 To 301 2.2.8 Cross Site Scripting

WordPress 404 To 301 2.2.8 Cross Site Scripting
Posted Nov 9, 2016
Authored by Securify B.V., Alyssa Milburn

WordPress 404 to 301 plugin version 2.2.8 suffers from a persistent cross site scripting vulnerability.

tags | exploit, xss
MD5 | 174b76a7406e75aa5d759887bab32717

WordPress 404 To 301 2.2.8 Cross Site Scripting

Change Mirror Download
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Stored Cross-Site Scripting vulnerability in 404 to 301 WordPress Plugin
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Alyssa Milburn <amilburn.at.zall.org>, July 2016

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Abstract
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A stored Cross-Site Scripting vulnerability was found in the 404 to 301
WordPress Plugin. This issue can be exploited by an anonymous user and
allows an attacker to perform a wide variety of actions, such as
stealing users' session tokens, or performing arbitrary actions on their
behalf.

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OVE ID
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OVE-20160719-0003

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Tested versions
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This issue was successfully tested on 404 to 301 WordPress Plugin
version 2.2.8.

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Fix
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This issue is resolved in 404 to 301 WordPress Plugin version 2.3.1.

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Details
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https://sumofpwn.nl/advisory/2016/stored_cross_site_scripting_vulnerability_in_404_to_301_wordpress_plugin.html

The vulnerability exists in the file admin/class-404-to-301-logs.php, which fails to correctly escape user-controlled strings which are output in HTML tables containing logs shown to site administrators, such as the Referer (ref) and User-Agent (ua) fields.

In order to exploit this issue, after an attack attempt has been made, an administrator must view the logs (via the WordPress administration console) provided by the plugin, by clicking '404 Error Logs'.
Proof of concept

Submit an HTTP request to a non-existent URL (to trigger the 404 handler) containing a header such as one of the following:

Referer: "<iframe src=/></iframe>
User-Agent: "<script>alert(/hi/);</script>

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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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