RHSA-2014:1083 - Security Advisory

Topic

Updated kernel-rt packages that fix multiple security issues and one bug
are now available for Red Hat Enterprise MRG 2.5.

Red Hat Product Security 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-rt packages contain the Linux kernel, the core of any Linux
operating system.

• A NULL pointer dereference flaw was found in the way the Linux kernel's

Stream Control Transmission Protocol (SCTP) implementation handled
simultaneous connections between the same hosts. A remote attacker could
use this flaw to crash the system. (CVE-2014-5077, Important)

• Multiple use-after-free flaws and an integer overflow flaw were found in

the way the Linux kernel's Advanced Linux Sound Architecture (ALSA)
implementation handled user controls. A local, privileged user could use
either of these flaws to crash the system. (CVE-2014-4653, CVE-2014-4654,
CVE-2014-4655, CVE-2014-4656, Moderate)

• An information leak flaw was found in the way the Linux kernel's Advanced

Linux Sound Architecture (ALSA) implementation handled access of the user
control's state. A local, privileged user could use this flaw to leak
kernel memory to user space. (CVE-2014-4652, Low)

This update also fixes the following bug:

• Prior to this update, the netconsole module was unavailable on MRG

Realtime kernels due to locking issues that disabled it. These locking
issues have been corrected, allowing the netconsole module to be re-enabled
and functional on Realtime kernels. (BZ#1088923)

Users are advised to upgrade to these updated packages, which upgrade the
kernel-rt kernel to version kernel-rt-3.10.33-rt32.45 and 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/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

• MRG Realtime 2 x86_64

Fixes

• BZ - 1113406 - CVE-2014-4652 Kernel: ALSA: control: protect user controls against races & memory disclosure
• BZ - 1113409 - CVE-2014-4653 Kernel: ALSA: control: do not access controls outside of protected regions
• BZ - 1113445 - CVE-2014-4654 CVE-2014-4655 Kernel: ALSA: control: use-after-free in replacing user controls
• BZ - 1113470 - CVE-2014-4656 Kernel: ALSA: control: integer overflow in id.index & id.numid
• BZ - 1122982 - CVE-2014-5077 Kernel: net: SCTP: fix a NULL pointer dereference during INIT collisions

CVEs

• CVE-2014-4655
• CVE-2014-4654
• CVE-2014-4656
• CVE-2014-5077
• CVE-2014-4653
• CVE-2014-4652

References

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