The LDAP backend in OpenStack Identity (Keystone) Grizzly and Havana, when removing a role on a tenant for a user who does not have that role, adds the role to the user, which allows local users to gain privileges.
References:- https://nvd.nist.gov/vuln/detail/CVE-2013-4477
- https://bugs.launchpad.net/keystone/+bug/1242855
- http://rhn.redhat.com/errata/RHSA-2014-0113.html
- http://www.openwall.com/lists/oss-security/2013/10/30/6
- http://www.ubuntu.com/usn/USN-2034-1
- https://github.com/openstack/keystone/commit/b17e7bec768bd53d3977352486378698a3db3cfa
- https://github.com/openstack/keystone/commit/c6800ca1ac984c879e75826df6694d6199444ea0
- https://github.com/advisories/GHSA-f889-wfwm-6p7m