RHSA-2014:0091 - Security Advisory

Topic

Updated openstack-neutron packages that fix one security issue, 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 link in
the References section.

Description

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

It was discovered that the metadata agent in OpenStack Networking was
missing an authorization check on the device ID that is bound to a specific
port. A remote tenant could guess the instance ID bound to a port and
retrieve metadata of another tenant, resulting in information disclosure.
Note that only OpenStack Networking setups running neutron-metadata-agent
were affected. (CVE-2013-6419)

Red Hat would like to thank Jeremy Stanley of the OpenStack Project for
reporting this issue. Upstream acknowledges Aaron Rosen of VMware as the
original reporter.

The openstack-neutron packages have been upgraded to upstream version
2013.2.1, which provides a number of bug fixes and enhancements over the
previous version. The most notable fixes and enhancements are:

• Support for multiple workers in the Neutron API. This can be achieved by

setting the 'workers=' parameter in the neutron.conf file.

• The downtime and report interval default settings are tuned for

neutron agents.

• The floating IP address stability has been enhanced.
• A heartbeat-related deadlock problem in neutron-server has been fixed.

(BZ#1045419)

This update also fixes the following bugs:

• An incorrect warning was displayed when running neutron-dhcp-agent with

Red Hat Enterprise Linux's version of dnsmasq. This meant that users were
incorrectly warned that Red Hat Enterprise Linux's dnsmasq version will not
work with neutron-dhcp-agent. This warning has been removed, and will no
longer be logged to the neutron-dhcp-agent log file. (BZ#1040196)

• A bug in the QPID topic consumer re-connection logic (under the v2

topology) caused qpidd to use a malformed subscriber address after
restarting, resulting in RPC requests sent to a topic with multiple servers
ending up being incorrectly multicast to all servers. This update removes
the special-case reconnect logic that handles UUID addresses, which in turn
avoids the incorrect establishment of multiple subscription to the same
fanout address. The QPID broker now simply automatically generates unique
queue names when clients reconnect. (BZ#1045067)

• Thread-consuming QPID messages were killed silently by unhandled errors,

thus resulting in isolating the component from the rest of the system.
With this update, consuming threads are made more resilient to errors by
ensuring they do not die on an unhandled error. The error is now logged,
and the consuming thread is retried. (BZ#1054249)

In addition, this update adds the following enhancement:

• Previously, instances connected to tenant networks gained outside

connectivity by going through an SNAT by the L3 agent hosting that
network's virtual router. With this release, the ability to disable
SNAT/PAT on virtual servers is added ensuring that an instance in a tenant
network subnet will retain its IP address as it passes through external
networks. For example, if 10.0.0.1 is an instance in the 10.0.0.0/8 tenant
network, R1, a virtual router that connects the 10.0.0.0/8 subnet to the
20.0.0.0/8 public provider networks, then you can use the 'neutron
router-gateway-set --disable-snat R1 public' command and any traffic from
10.0.0.1, which is forwarded out to the provider network, will retain its
actual source IP address of 10.0.0.1. This can be a flexible and useful
method to connect instances directly to a provider network, while retaining
it in a tenant network. (BZ#1046070)

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 - 1038737 - neutron is creating duplicated NAT rules, resulting in instances without network connection
• BZ - 1039148 - CVE-2013-6419 OpenStack Neutron and Nova: Metadata queries from Neutron to Nova are not restricted by tenant
• BZ - 1039528 - Neutron rootwrap does not follow packaging guidelines
• BZ - 1040196 - Remove dnsmasq version warning for dhcp-agent on RHEL
• BZ - 1045067 - [oslo] With QPID, RPC calls to a topic are always fanned-out to all subscribers.
• BZ - 1046070 - Configurable External Gateway Modes
• BZ - 1046087 - The error message that indicates manual DB stamping is needed is not clear enough
• BZ - 1054249 - Thread consuming qpid messages can die silently

CVEs

• CVE-2013-6419

References

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