RHSA-2014:0899 - Security Advisory

Topic

Updated openstack-neutron packages that fix two security issues, several bugs,
and add various enhancements are now available for Red Hat Enterprise Linux
OpenStack Platform 4.0.

The Red Hat Security Response Team has rated this update as having Moderate
security impact. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available from the CVE links in the
References section.

Description

The openstack-neutron packages provide Openstack Networking (neutron), the
virtual network service.

OpenStack Networking (neutron) is a pluggable, scalable, and API-driven system
that provisions networking services to virtual machines. Its main function is to
manage connectivity to and from virtual machines.

It was discovered that an authenticated user could add a security group rule
with an invalid CIDR causing the openvswitch-agent process to fail and prevent
further rules from being applied. (CVE-2014-0187)

It was discovered that an authenticated user could add an IPv6 private subnet to
an L3 router causing L3-agent to break in a way that prevents further IPv4
addresses from being attached. Removal of the faulty network can only be done
directly at the database level. Only Neutron setups using IPv6 and L3-agent are
affected by this issue. (CVE-2014-4167)

This update also fixes several bugs and adds enhancements:

• Previously, running 'cloud-init' resulted in each instance sending requests to

the metadata agent, which in turn queried Networking server.
Consequently, booting multiple concurrent instances resulted in metadata agent
queries producing heavy load for 'neutron-server'.
This update addresses this issue by implementing a short lifetime cache for the
metadata agent. Metadata agent now only queries Networking when data is not
present in its cache, with the result of decreased load on Networking server
during 'cloud-init' within instances. (BZ#1101494).

• With this update, Networking (neutron) packages now update the

'/etc/sudoers.d/neutron' file. Consequently, any local changes have been
relocated to the '/etc/sudoers.d/neutron.rpmsave' file, and will need to be
merged back manually.
To avoid the need for manual updates in future, please apply local changes in a
separate 'sudoers.d' file. (BZ#1115406)

• Previously, Networking would fail to reliably communicate with Qpid. This

behavior was due to an incorrect message subject set in the Qpid layer used by
Networking.
This update addresses this issue by setting a correct subject when sending a
Qpid message. As a result, Networking now works reliably with the new Qpid
server. (BZ#1108549)

All openstack-neutron users are advised to upgrade to these updated packages,
which correct these issues and add these enhancements.

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/site/articles/11258

Affected Products

• Red Hat OpenStack 4.0 x86_64

Fixes

• BZ - 1090132 - CVE-2014-0187 openstack-neutron: security groups bypass through invalid CIDR
• BZ - 1108549 - RHOSP 4 is incompatible with python-qpid >= 0.18-11
• BZ - 1110139 - CVE-2014-4167 openstack-neutron: L3-agent denial of service through IPv6 subnet
• BZ - 1115406 - Neutron packaging attempts to update sudoers config file avoiding usual procedure

CVEs

• CVE-2014-4167
• CVE-2014-0187

References

• https://access.redhat.com/security/updates/classification/#moderate