(RHSA-2017:2649) Moderate: instack-undercloud security, bug fix, and enhancement update

instack-undercloud provides a collection of scripts and elements that can be used to install an OpenStack undercloud (using python-instack).

The following packages have been upgraded to a later upstream version:
instack-undercloud (5.3.0). (BZ#1479841)

Security Fix(es):

• A flaw was found in instack-undercloud 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. (CVE-2017-7549)

This issue was discovered by Matthew Booth (Red Hat).