Important: kernel security and bug fix update

Synopsis

Important: kernel security and bug fix update

Type/Severity

Security Advisory: Important

Topic

Updated kernel packages that fix multiple security issues and several bugs
are now available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having
important 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

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

This update fixes the following security issues:

• A flaw was found in the way the Linux kernel's Stream Control
  Transmission Protocol (SCTP) implementation handled duplicate cookies. If a
  local user queried SCTP connection information at the same time a remote
  attacker has initialized a crafted SCTP connection to the system, it could
  trigger a NULL pointer dereference, causing the system to crash.
  (CVE-2013-2206, Important)
  
• It was found that the fix for CVE-2012-3552 released via RHSA-2012:1304
  introduced an invalid free flaw in the Linux kernel's TCP/IP protocol suite
  implementation. A local, unprivileged user could use this flaw to corrupt
  kernel memory via crafted sendmsg() calls, allowing them to cause a denial
  of service or, potentially, escalate their privileges on the system.
  (CVE-2013-2224, Important)
  
• A flaw was found in the Linux kernel's Performance Events implementation.
  On systems with certain Intel processors, a local, unprivileged user could
  use this flaw to cause a denial of service by leveraging the perf subsystem
  to write into the reserved bits of the OFFCORE_RSP_0 and OFFCORE_RSP_1
  model-specific registers. (CVE-2013-2146, Moderate)
  
• An invalid pointer dereference flaw was found in the Linux kernel's
  TCP/IP protocol suite implementation. A local, unprivileged user could use
  this flaw to crash the system or, potentially, escalate their privileges on
  the system by using sendmsg() with an IPv6 socket connected to an IPv4
  destination. (CVE-2013-2232, Moderate)
  
• Information leak flaws in the Linux kernel's Bluetooth implementation
  could allow a local, unprivileged user to leak kernel memory to user-space.
  (CVE-2012-6544, Low)
  
• An information leak flaw in the Linux kernel could allow a privileged,
  local user to leak kernel memory to user-space. (CVE-2013-2237, Low)
  

This update also fixes several bugs. Documentation for these changes will
be available shortly from the Technical Notes document linked to in the
References section.

Users should upgrade to these updated packages, which contain backported
patches to correct these issues. The system must be rebooted for this
update to take effect.

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

To install kernel packages manually, use "rpm -ivh [package]". Do not
use "rpm -Uvh" as that will remove the running kernel binaries from
your system. You may use "rpm -e" to remove old kernels after
determining that the new kernel functions properly on your system.

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux Server - Extended Update Support 6.4 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support 6.4 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for IBM z Systems 6 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 6.4 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 6.4 ppc64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 i386
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.4 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.4 i386
• Red Hat Gluster Storage Server for On-premise 2.1 x86_64
• Red Hat Storage for Public Cloud (via RHUI) 2.1 x86_64
• Red Hat Enterprise Linux Server - AUS 6.4 x86_64

Fixes

• BZ - 922414 - CVE-2012-6544 Kernel: Bluetooth: HCI & L2CAP information leaks
• BZ - 971309 - CVE-2013-2146 Kernel: perf/x86: offcore_rsp valid mask for SNB/IVB
• BZ - 976562 - CVE-2013-2206 kernel: sctp: duplicate cookie handling NULL pointer dereference
• BZ - 979936 - CVE-2013-2224 kernel: net: IP_REPOPTS invalid free
• BZ - 981220 - CVE-2013-2237 Kernel: net: af_key: initialize satype in key_notify_policy_flush
• BZ - 981552 - CVE-2013-2232 Kernel: ipv6: using ipv4 vs ipv6 structure during routing lookup in sendmsg

CVEs

• CVE-2012-6544
• CVE-2013-2232
• CVE-2013-2224
• CVE-2013-2237
• CVE-2013-2206
• CVE-2013-2146

References

• https://access.redhat.com/security/updates/classification/#important
• https://rhn.redhat.com/errata/RHSA-2012-1304.html
• https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.4_Technical_Notes/kernel.html