module

Wordpress MailPoet Newsletters (wysija-newsletters) Unauthenticated File Upload

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Disclosed
2014-07-01
Created
2018-05-30

Description

The Wordpress plugin "MailPoet Newsletters" (wysija-newsletters) before 2.6.8
is vulnerable to an unauthenticated file upload. The exploit uses the Upload Theme
functionality to upload a zip file containing the payload. The plugin uses the
admin_init hook, which is also executed for unauthenticated users when accessing
a specific URL. The first fix for this vulnerability appeared in version 2.6.7,
but the fix can be bypassed. In PHP's default configuration,
a POST variable overwrites a GET variable in the $_REQUEST array. The plugin
uses $_REQUEST to check for access rights. By setting the POST parameter to
something not beginning with 'wysija_', the check is bypassed. Wordpress uses
the $_GET array to determine the page, so it is not affected by this. The developers
applied the fixes to all previous versions too.

Authors

Marc-Alexandre Montpas
Christian Mehlmauer FireFart@gmail.com

Platform

PHP

Architectures

php

References

Module Options

To display the available options, load the module within the Metasploit console and run the commands ‘show options’ or ‘show advanced’:


    msf > use exploit/unix/webapp/wp_wysija_newsletters_upload
    msf exploit(wp_wysija_newsletters_upload) > show targets
        ...targets...
    msf exploit(wp_wysija_newsletters_upload) > set TARGET < target-id >
    msf exploit(wp_wysija_newsletters_upload) > show options
        ...show and set options...
    msf exploit(wp_wysija_newsletters_upload) > exploit
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