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AUSCERT External Security Bulletin Redistribution
Moderate: instack-undercloud security update
13 September 2017
AusCERT Security Bulletin Summary
Publisher: Red Hat
Operating System: Red Hat Enterprise Linux Server 7
Impact/Access: Modify Arbitrary Files -- Existing Account
CVE Names: CVE-2017-7549
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Red Hat Security Advisory
Synopsis: Moderate: instack-undercloud security update
Advisory ID: RHSA-2017:2693-01
Product: Red Hat Enterprise Linux OpenStack Platform
Advisory URL: https://access.redhat.com/errata/RHSA-2017:2693
Issue date: 2017-09-12
CVE Names: CVE-2017-7549
An update for instack-undercloud is now available for Red Hat Enterprise
Linux OpenStack Platform director 7.0 for RHEL 7.
Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.
2. Relevant releases/architectures:
OpenStack 7.0 Director for RHEL 7 - noarch
instack-undercloud provides a collection of scripts and elements that can
be used to install an OpenStack undercloud (using python-instack).
* 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).
For details on how to apply this update, which includes the changes
described in this advisory, refer to:
5. Bugs fixed (https://bugzilla.redhat.com/):
1477403 - CVE-2017-7549 instack-undercloud: uses hardcoded /tmp paths
6. Package List:
OpenStack 7.0 Director for RHEL 7:
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
The Red Hat security contact is <firstname.lastname@example.org>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2017 Red Hat, Inc.
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