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.
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_uploadmsf undefined(wysija_newsletters_upload) > show actions ...actions...msf undefined(wysija_newsletters_upload) > set ACTION < action-name >msf undefined(wysija_newsletters_upload) > show options ...show and set options...msf undefined(wysija_newsletters_upload) > runPrioritise with Active Threat Intelligence
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