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Red Hat Security Advisory 2014-1763-01

Red Hat Security Advisory 2014-1763-01
Posted Oct 30, 2014
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2014-1763-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. A flaw was found in the way the Linux kernel's futex subsystem handled reference counting when requeuing futexes during futex_wait(). A local, unprivileged user could use this flaw to zero out the reference counter of an inode or an mm struct that backs up the memory area of the futex, which could lead to a use-after-free flaw, resulting in a system crash or, potentially, privilege escalation. A NULL pointer dereference flaw was found in the way the Linux kernel's Stream Control Transmission Protocol implementation handled simultaneous connections between the same hosts. A remote attacker could use this flaw to crash the system.

tags | advisory, remote, kernel, local, protocol
systems | linux, redhat
advisories | CVE-2014-0205, CVE-2014-5077
MD5 | ca07233fab2073aabf1d79398b6b0382

Red Hat Security Advisory 2014-1763-01

Change Mirror Download
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=====================================================================
Red Hat Security Advisory

Synopsis: Important: kernel security update
Advisory ID: RHSA-2014:1763-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2014-1763.html
Issue date: 2014-10-30
CVE Names: CVE-2014-0205 CVE-2014-5077
=====================================================================

1. Summary:

Updated kernel packages that fix two security issues are now available for
Red Hat Enterprise Linux 6.2 Advanced Update Support.

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.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AUS (v. 6.2 server) - noarch, x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 6.2) - x86_64

3. Description:

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

* A flaw was found in the way the Linux kernel's futex subsystem handled
reference counting when requeuing futexes during futex_wait(). A local,
unprivileged user could use this flaw to zero out the reference counter of
an inode or an mm struct that backs up the memory area of the futex, which
could lead to a use-after-free flaw, resulting in a system crash or,
potentially, privilege escalation. (CVE-2014-0205)

* 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)

The security impact of the CVE-2014-0205 issue was discovered by Mateusz
Guzik of Red Hat.

All kernel users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. The system must be
rebooted for this update to take effect.

4. 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.

5. Bugs fixed (https://bugzilla.redhat.com/):

1094455 - CVE-2014-0205 kernel: futex: refcount issue in case of requeue
1122982 - CVE-2014-5077 Kernel: net: SCTP: fix a NULL pointer dereference during INIT collisions

6. Package List:

Red Hat Enterprise Linux AUS (v. 6.2 server):

Source:
kernel-2.6.32-220.56.1.el6.src.rpm

noarch:
kernel-doc-2.6.32-220.56.1.el6.noarch.rpm
kernel-firmware-2.6.32-220.56.1.el6.noarch.rpm

x86_64:
kernel-2.6.32-220.56.1.el6.x86_64.rpm
kernel-debug-2.6.32-220.56.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-220.56.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-220.56.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-220.56.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-220.56.1.el6.x86_64.rpm
kernel-devel-2.6.32-220.56.1.el6.x86_64.rpm
kernel-headers-2.6.32-220.56.1.el6.x86_64.rpm
perf-2.6.32-220.56.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-220.56.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-220.56.1.el6.x86_64.rpm

Red Hat Enterprise Linux Server Optional AUS (v. 6.2):

Source:
kernel-2.6.32-220.56.1.el6.src.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-220.56.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-220.56.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-220.56.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-220.56.1.el6.x86_64.rpm
python-perf-2.6.32-220.56.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-220.56.1.el6.x86_64.rpm

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2014-0205
https://access.redhat.com/security/cve/CVE-2014-5077
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2014 Red Hat, Inc.
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