Moderate: kernel security, bug fix, and enhancement update

Synopsis

Moderate: kernel security, bug fix, and enhancement update

Type/Severity

Security Advisory: Moderate

Topic

Updated kernel packages that fix two security issues, one bug, and add two
enhancements are now available for Red Hat OpenStack 3.0.

The Red Hat Security Response Team has rated this update as having moderate
security impact. Common Vulnerability Scoring System (CVSS) base scores,
which give detailed severity ratings, are available for each vulnerability
from the CVE links in the References section.

Description

Red Hat OpenStack 3.0 includes a custom Red Hat Enterprise Linux 6.4
kernel. These custom kernel packages include support for network
namespaces; this support is required to facilitate advanced OpenStack
Networking deployments.

• A flaw was found in the way the Linux kernel's TCP/IP protocol suite
  implementation handled IPv6 sockets that used the UDP_CORK option. A local,
  unprivileged user could use this flaw to cause a denial of service.
  (CVE-2013-4162, Moderate)
  
• An information leak flaw was found in the way the Linux kernel's device
  mapper subsystem, under certain conditions, interpreted data written to
  snapshot block devices. An attacker could use this flaw to read data from
  disk blocks in free space, which are normally inaccessible. (CVE-2013-4299,
  Moderate)
  

Red Hat would like to thank Hannes Frederic Sowa for reporting
CVE-2013-4162; and Fujitsu for reporting CVE-2013-4299.

This update also fixes the following bug:

• Prior to this update, while performing Generic Routing Encapsulation
  (GRE), the possibility of having a 802.1Q inner header was not considered
  during the Generic Segmentation Offloading (GSO). With this update, a check
  has been added to detect the use of 802.1Q and handle the packet
  accordingly. (BZ#1005804)
  

In addition, this update adds the following enhancements:

• This update adds support for Distributed Overlay Virtual Ethernet (DOVE).
  (BZ#1009025)
  
• This update adds support for Virtual Extensible LAN (VXLAN) as an Open
  vSwitch (OVS) tunneling type. (BZ#1009006)
  

More information on the Red Hat Enterprise Linux 6.4 kernel packages upon
which these custom kernel packages are based is available in
RHSA-2013:1436:

https://rhn.redhat.com/errata/RHSA-2013-1436.html

All Red Hat OpenStack 3.0 users deploying the OpenStack Networking service
are advised to install these updated packages.

Solution

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

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

This Red Hat OpenStack 3.0 kernel may be installed by running this command
while logged in as the root user on a system that has the required
entitlements and subscriptions attached:

# yum install "kernel-2.6.*.openstack.el6.x86_64"

Documentation for both stable and preview releases of Red Hat OpenStack is
available at:

https://access.redhat.com/site/documentation/Red_Hat_OpenStack/

In particular it is highly recommended that all users read the Release
Notes document for the relevant Red Hat OpenStack release prior to
installation.

Affected Products

• Red Hat OpenStack grizzly x86_64

Fixes

• BZ - 987627 - CVE-2013-4162 Kernel: net: panic while pushing pending data out of a IPv6 socket with UDP_CORK enabled
• BZ - 1004233 - CVE-2013-4299 kernel: dm: dm-snapshot data leak
• BZ - 1005804 - modem-like speed when transmitting TCP to a floating IP

CVEs

• CVE-2013-4162
• CVE-2013-4299

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://rhn.redhat.com/errata/RHSA-2013-1436.html
• https://access.redhat.com/site/documentation/Red_Hat_OpenStack/