Reporter Tom Adams
Software: WP User Groups
Advisory report: https://advisories.dxw.com/advisories/csrf-wp-user-groups/
CVE: Awaiting assignment
CVSS: 4.3 (Medium; AV:N/AC:M/Au:N/C:N/I:P/A:N)
CSRF in WP User Groups allows anybody to modify user groups and types
WP User Groups creates new bulk actions to put users into (or remove them from) agroupsa and atypesa. A nonce is sent with the request, but it is not checked.
Proof of concept
Activate the plugin
Make sure you have a user with user_id=1
Visit http://localhost/wp-admin/edit-tags.php?taxonomy=user-group and create a group called aCata with slug acata
If you go back to http://localhost/wp-admin/users.php youall see the user with user_id=1 is now in the group aCata
Upgrade to version 2.1.1 or later.
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This vulnerability will be published if we do not receive a response to this report with 14 days.
2018-04-16: Reported to plugin author via email
2018-04-16: Vendor reported fixed in 2.1.1
2018-05-11: Advisory published
Discovered by dxw:
Please visit security.dxw.com for more information.