Our Moodle installation serves a few customers. These customers shouldn't be able to see each others courses. We've done this by editing permissions so that restricted courses are hidden unless you are enrolled.
However, it's come to my attention that users can still access a full list of courses by going to: examplemoodle.com/course/
I've looked through the permissions and can't seem to block access to that page.
Moodle 2.7.2 (Build: 20140908)
[edit: Also found that user's can access a full list of courses through the Navigation block, help nuking that block would be appreciated!]
[edit2: Never mind, removed the block.]