A vulnerability exists in the User module, where if some specific contributed or custom code triggers a rebuild of the user profile form, a registered user can be granted all user roles on the site. This would typically result in the user gaining administrative access.
This issue is mitigated by the fact that it requires contributed or custom code that performs a form rebuild during submission of the user profile form.
Created drupal7 tracking bugs for this issue:
Affects: fedora-all [bug 1347507]
Affects: epel-all [bug 1347508]
*** This bug has been marked as a duplicate of bug 1351214 ***