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WordPress W3 Total Cache 0.9.4.1 Cross Site Scripting

WordPress W3 Total Cache 0.9.4.1 Cross Site Scripting
Posted Nov 11, 2016
Authored by Securify B.V., Sipke Mellema

WordPress W3 Total Cache plugin version 0.9.4.1 suffers from a cross site scripting vulnerability.

tags | exploit, xss
SHA-256 | dad348fbfcafead56be5e0cbe894d149a654cc0e0a985c5d4ecbd785eae06fff

WordPress W3 Total Cache 0.9.4.1 Cross Site Scripting

Change Mirror Download
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Reflected Cross-Site Scripting vulnerability in W3 Total Cache plugin
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Sipke Mellema, July 2016

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Abstract
------------------------------------------------------------------------
A Cross-Site Scripting vulnerability was found in the W3 Total Cache
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 URL provided by an attacker.

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OVE ID
------------------------------------------------------------------------
OVE-20160719-0004

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Tested versions
------------------------------------------------------------------------
This issue was successfully tested on W3 Total Cache version 0.9.4.1.

------------------------------------------------------------------------
Fix
------------------------------------------------------------------------
This issue is resolved in W3 Total Cache version 0.9.5.

------------------------------------------------------------------------
Details
------------------------------------------------------------------------
https://sumofpwn.nl/advisory/2016/reflected_cross_site_scripting_vulnerability_in_w3_total_cache_plugin.html

The issue exists in the file inc/options/support/form.php and is caused by the lack of output encoding on the request_id request parameter. The vulnerable code is listed below.

<input type="hidden" name="request_type" value="<?php echo $request_type; ?>" />
<input type="hidden" name="request_id" value="<?php echo $request_id; ?>" />
<input type="hidden" name="payment" value="<?php echo $payment; ?>" />

Proof of concept


Have an authenticated admin visit the URL:

http://<target>/wp-admin/admin.php?page=w3tc_support&request_type=bug_report&request_id="><script>alert('sumofpwn.nl');</script>

A pop-up box should appear, meaning the JavaScript contained in the request_id request parameter was executed by the browser.

------------------------------------------------------------------------
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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