The lockwrap function in port-proxy/bin/openshift-port-proxy-cfg in Red Hat OpenShift Origin before 1.1 allows local users to overwrite arbitrary files via a symlink attack on a temporary file with a predictable name in /tmp.
https://github.com/openshift/origin-server/pull/1136
https://github.com/openshift/origin-server/commit/524465f70a32d0eb6bf047e6a05c76c22d52bfa2