A flaw was found in instack-undercloud 7.2.0 as packaged in Red Hat OpenStack Platform Pike, 6.1.0 as packaged in Red Hat OpenStack Platform Oacta, 5.3.0 as packaged in Red Hat OpenStack Newton, where pre-install and security policy scripts used insecure temporary files. A local user could exploit this flaw to conduct a symbolic-link attack, allowing them to overwrite the contents of arbitrary files.
https://bugzilla.redhat.com/show_bug.cgi?id=1477403
https://access.redhat.com/errata/RHSA-2017:2726
https://access.redhat.com/errata/RHSA-2017:2693
https://access.redhat.com/errata/RHSA-2017:2687
https://access.redhat.com/errata/RHSA-2017:2649