Ultimate Member versions less than 1.3.76 contain a critical security issue that allows unauthenticated users to reset any users password to an arbitrary value. This could allow an external attacker to take over an Administrator account and completely compromise the WordPress website. The WordPress.org repository claims there are 40,000+ active installs of this plugin, though there is no way of knowing how many are running vulnerable versions.
If you are running an older version, upgrade immediately. This flaw exists as far back as 1.0.0, which was the initial release of the plugin. The change log for the plugin doesn’t mention the specific flaw and
at this time I have not seen an announcement from the Ultimate Member developer. On December 8th, the developer published a blog post and a twitter post regarding the issue.
Due to the severity of this vulnerability, I will not provide specific details of the vulnerability at this time.
- 11/22/2016 12:00pm Sent vulnerability information to vendor
- 11/23/2016 3:40am Vendor replied saying issue was resolved with github commit b66c99b
- 11/23/2016 8:45am Sent followup to vendor explaining additional vulnerability
- 11/28/2016 4:52am Received vendor response saying additional fix was added with github commit c54e8d3
- 11/28/2016 Ultimate Member version 1.3.76 released
During my recent search for a membership/community plugin I discovered PeepSo, which looks promising for a relatively new product. The WordPress.org plugin page claims there are 800+ users, so this isn’t going to affect too many users.
During initial analysis, I discovered a vulnerability that allows a logged in user to upgrade their account to be an administrator. If you are using PeepSo <= 1.6.0, upgrade immediately.
The developers were quick to respond and deal with this issue, the updated version restricts the meta keys that can be updated.
PeepSo AJAX Actions
PeepSo has implemented their own AJAX handler that is handled differently than the typical WordPress AJAX handler. Their handler allows any function that is a derivative of the PeepSoAjaxCallback class to be called by any user and it is up to the individual functions to provide any form of security. This isn’t necessarily a bad setup, but it does require developers to be extra careful when adding additional functionality.
Unfiltered User Input
A logged in user can call the PeepSoProfilePreferencesAjax->save() function and save meta data for their own account. The function does keep users from modifying an account other than their own. Simply by passing the ‘wp_capabilities’ meta key, a user can escalate their account to be an administrator.
- 6/22/2016 3:10pm Contact information requested
- 6/22/2016 7:10pm Response received from developer
- 6/22/2016 7:19pm Disclosure email sent
- 6/23/2016 2:31am Received copy of updated version of code
- 6/29/2016 Version 1.6.1 released on WordPress.org
While looking for a membership plugin for WordPress I stumbled on MemberSonic and the free version of their plugin MemberSonic Lite. After a 10 minute wait while watching their promotional video they finally email you a link to the Lite version. I could not find any indication on the site regarding how many sites/users their plugins have. It appears that they released something back in September of 2012, so there must be more than a handful of users out there.
Anyone using MemberSonic Lite should upgrade immediately, version 1.2 has a flaw allowing an unauthorized user to login to any account simply by knowing the email address associated with the account, this includes any accounts with administrator privileges.
I do not know if this affects the commercial version of the product and I have not done any further auditing of the Lite product. As of 6/28/2016, there has not been a new posting on their blog related to this issue or announcing an update to the Pro version.
- 6/20/2016 12:51pm Initial email attempt
- 6/22/2016 7:45am Additional email attempt
- 6/23/2016 2:49pm Final email attempt
- 6/23/2016 3:07pm Email response received
- 6/23/2016 3:16pm Full disclosure email sent
- 6/24/2016 9:53am Received updated version 1.301
- 6/24/2016 1:19pm Received updated version 1.302 that resolves original issue