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WordPress WP User Groups 2.0.0 Cross Site Request Forgery

WordPress WP User Groups 2.0.0 Cross Site Request Forgery
Posted May 12, 2018
Authored by Tom Adams

WordPress WP User Groups plugin version 2.0.0 suffers from a cross site request forgery vulnerability.

tags | exploit, csrf
SHA-256 | 509946df5bd9ecce73ceac8f4fc333c4607a97cee298af0243863dead17a7716

WordPress WP User Groups 2.0.0 Cross Site Request Forgery

Change Mirror Download
Details
================
Software: WP User Groups
Version: 2.0.0
Homepage: https://wordpress.org/plugins/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)

Description
================
CSRF in WP User Groups allows anybody to modify user groups and types

Vulnerability
================
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
Visit http://localhost/wp-admin/users.php?users%5B%5D=1&action2=add-cat-user-group
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


Mitigations
================
Upgrade to version 2.1.1 or later.

Disclosure policy
================
dxw believes in responsible disclosure. Your attention is drawn to our disclosure policy: https://security.dxw.com/disclosure/

Please contact us on security@dxw.com to acknowledge this report if you received it via a third party (for example, plugins@wordpress.org) as they generally cannot communicate with us on your behalf.

This vulnerability will be published if we do not receive a response to this report with 14 days.

Timeline
================

2018-04-12: Discovered
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:
================
Tom Adams
Please visit security.dxw.com for more information.




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