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Red Hat Security Advisory 2013-1449-01

Red Hat Security Advisory 2013-1449-01
Posted Oct 22, 2013
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2013-1449-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. A flaw was found in the way the Linux kernel handled the creation of temporary IPv6 addresses. If the IPv6 privacy extension was enabled, an attacker on the local network could disable IPv6 temporary address generation, leading to a potential information disclosure. An information leak flaw was found in the way 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.

tags | advisory, kernel, local, info disclosure
systems | linux, redhat
advisories | CVE-2013-0343, CVE-2013-4299, CVE-2013-4345, CVE-2013-4368
MD5 | 785932c03aa6d484d042ed27f4c18736

Red Hat Security Advisory 2013-1449-01

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

Synopsis: Moderate: kernel security and bug fix update
Advisory ID: RHSA-2013:1449-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2013-1449.html
Issue date: 2013-10-22
CVE Names: CVE-2013-0343 CVE-2013-4299 CVE-2013-4345
CVE-2013-4368
=====================================================================

1. Summary:

Updated kernel packages that fix multiple security issues and one bug are
now available for Red Hat Enterprise Linux 5.

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.

2. Relevant releases/architectures:

Red Hat Enterprise Linux (v. 5 server) - i386, ia64, noarch, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, noarch, 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 handled the creation of
temporary IPv6 addresses. If the IPv6 privacy extension was enabled
(/proc/sys/net/ipv6/conf/eth0/use_tempaddr is set to '2'), an attacker on
the local network could disable IPv6 temporary address generation, leading
to a potential information disclosure. (CVE-2013-0343, Moderate)

* An information leak flaw was found in the way 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)

* An off-by-one flaw was found in the way the ANSI CPRNG implementation in
the Linux kernel processed non-block size aligned requests. This could lead
to random numbers being generated with less bits of entropy than expected
when ANSI CPRNG was used. (CVE-2013-4345, Moderate)

* An information leak flaw was found in the way Xen hypervisor emulated the
OUTS instruction for 64-bit paravirtualized guests. A privileged guest user
could use this flaw to leak hypervisor stack memory to the guest.
(CVE-2013-4368, Moderate)

Red Hat would like to thank Fujitsu for reporting CVE-2013-4299, Stephan
Mueller for reporting CVE-2013-4345, and the Xen project for reporting
CVE-2013-4368.

This update also fixes the following bug:

* A bug in the GFS2 code prevented glock work queues from freeing
glock-related memory while the glock memory shrinker repeatedly queued a
large number of demote requests, for example when performing a simultaneous
backup of several live GFS2 volumes with a large file count. As a
consequence, the glock work queues became overloaded which resulted in a
high CPU usage and the GFS2 file systems being unresponsive for a
significant amount of time. A patch has been applied to alleviate this
problem by calling the yield() function after scheduling a certain amount
of tasks on the glock work queues. The problem can now occur only with
extremely high work loads. (BZ#1014714)

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/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.

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

914664 - CVE-2013-0343 kernel: handling of IPv6 temporary addresses
1004233 - CVE-2013-4299 kernel: dm: dm-snapshot data leak
1007690 - CVE-2013-4345 kernel: ansi_cprng: off by one error in non-block size request
1012550 - CVE-2013-4368 xen: information leak through outs instruction emulation (XSA-67)

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/kernel-2.6.18-371.1.2.el5.src.rpm

i386:
kernel-2.6.18-371.1.2.el5.i686.rpm
kernel-PAE-2.6.18-371.1.2.el5.i686.rpm
kernel-PAE-debuginfo-2.6.18-371.1.2.el5.i686.rpm
kernel-PAE-devel-2.6.18-371.1.2.el5.i686.rpm
kernel-debug-2.6.18-371.1.2.el5.i686.rpm
kernel-debug-debuginfo-2.6.18-371.1.2.el5.i686.rpm
kernel-debug-devel-2.6.18-371.1.2.el5.i686.rpm
kernel-debuginfo-2.6.18-371.1.2.el5.i686.rpm
kernel-debuginfo-common-2.6.18-371.1.2.el5.i686.rpm
kernel-devel-2.6.18-371.1.2.el5.i686.rpm
kernel-headers-2.6.18-371.1.2.el5.i386.rpm
kernel-xen-2.6.18-371.1.2.el5.i686.rpm
kernel-xen-debuginfo-2.6.18-371.1.2.el5.i686.rpm
kernel-xen-devel-2.6.18-371.1.2.el5.i686.rpm

noarch:
kernel-doc-2.6.18-371.1.2.el5.noarch.rpm

x86_64:
kernel-2.6.18-371.1.2.el5.x86_64.rpm
kernel-debug-2.6.18-371.1.2.el5.x86_64.rpm
kernel-debug-debuginfo-2.6.18-371.1.2.el5.x86_64.rpm
kernel-debug-devel-2.6.18-371.1.2.el5.x86_64.rpm
kernel-debuginfo-2.6.18-371.1.2.el5.x86_64.rpm
kernel-debuginfo-common-2.6.18-371.1.2.el5.x86_64.rpm
kernel-devel-2.6.18-371.1.2.el5.x86_64.rpm
kernel-headers-2.6.18-371.1.2.el5.x86_64.rpm
kernel-xen-2.6.18-371.1.2.el5.x86_64.rpm
kernel-xen-debuginfo-2.6.18-371.1.2.el5.x86_64.rpm
kernel-xen-devel-2.6.18-371.1.2.el5.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/kernel-2.6.18-371.1.2.el5.src.rpm

i386:
kernel-2.6.18-371.1.2.el5.i686.rpm
kernel-PAE-2.6.18-371.1.2.el5.i686.rpm
kernel-PAE-debuginfo-2.6.18-371.1.2.el5.i686.rpm
kernel-PAE-devel-2.6.18-371.1.2.el5.i686.rpm
kernel-debug-2.6.18-371.1.2.el5.i686.rpm
kernel-debug-debuginfo-2.6.18-371.1.2.el5.i686.rpm
kernel-debug-devel-2.6.18-371.1.2.el5.i686.rpm
kernel-debuginfo-2.6.18-371.1.2.el5.i686.rpm
kernel-debuginfo-common-2.6.18-371.1.2.el5.i686.rpm
kernel-devel-2.6.18-371.1.2.el5.i686.rpm
kernel-headers-2.6.18-371.1.2.el5.i386.rpm
kernel-xen-2.6.18-371.1.2.el5.i686.rpm
kernel-xen-debuginfo-2.6.18-371.1.2.el5.i686.rpm
kernel-xen-devel-2.6.18-371.1.2.el5.i686.rpm

ia64:
kernel-2.6.18-371.1.2.el5.ia64.rpm
kernel-debug-2.6.18-371.1.2.el5.ia64.rpm
kernel-debug-debuginfo-2.6.18-371.1.2.el5.ia64.rpm
kernel-debug-devel-2.6.18-371.1.2.el5.ia64.rpm
kernel-debuginfo-2.6.18-371.1.2.el5.ia64.rpm
kernel-debuginfo-common-2.6.18-371.1.2.el5.ia64.rpm
kernel-devel-2.6.18-371.1.2.el5.ia64.rpm
kernel-headers-2.6.18-371.1.2.el5.ia64.rpm
kernel-xen-2.6.18-371.1.2.el5.ia64.rpm
kernel-xen-debuginfo-2.6.18-371.1.2.el5.ia64.rpm
kernel-xen-devel-2.6.18-371.1.2.el5.ia64.rpm

noarch:
kernel-doc-2.6.18-371.1.2.el5.noarch.rpm

ppc:
kernel-2.6.18-371.1.2.el5.ppc64.rpm
kernel-debug-2.6.18-371.1.2.el5.ppc64.rpm
kernel-debug-debuginfo-2.6.18-371.1.2.el5.ppc64.rpm
kernel-debug-devel-2.6.18-371.1.2.el5.ppc64.rpm
kernel-debuginfo-2.6.18-371.1.2.el5.ppc64.rpm
kernel-debuginfo-common-2.6.18-371.1.2.el5.ppc64.rpm
kernel-devel-2.6.18-371.1.2.el5.ppc64.rpm
kernel-headers-2.6.18-371.1.2.el5.ppc.rpm
kernel-headers-2.6.18-371.1.2.el5.ppc64.rpm
kernel-kdump-2.6.18-371.1.2.el5.ppc64.rpm
kernel-kdump-debuginfo-2.6.18-371.1.2.el5.ppc64.rpm
kernel-kdump-devel-2.6.18-371.1.2.el5.ppc64.rpm

s390x:
kernel-2.6.18-371.1.2.el5.s390x.rpm
kernel-debug-2.6.18-371.1.2.el5.s390x.rpm
kernel-debug-debuginfo-2.6.18-371.1.2.el5.s390x.rpm
kernel-debug-devel-2.6.18-371.1.2.el5.s390x.rpm
kernel-debuginfo-2.6.18-371.1.2.el5.s390x.rpm
kernel-debuginfo-common-2.6.18-371.1.2.el5.s390x.rpm
kernel-devel-2.6.18-371.1.2.el5.s390x.rpm
kernel-headers-2.6.18-371.1.2.el5.s390x.rpm
kernel-kdump-2.6.18-371.1.2.el5.s390x.rpm
kernel-kdump-debuginfo-2.6.18-371.1.2.el5.s390x.rpm
kernel-kdump-devel-2.6.18-371.1.2.el5.s390x.rpm

x86_64:
kernel-2.6.18-371.1.2.el5.x86_64.rpm
kernel-debug-2.6.18-371.1.2.el5.x86_64.rpm
kernel-debug-debuginfo-2.6.18-371.1.2.el5.x86_64.rpm
kernel-debug-devel-2.6.18-371.1.2.el5.x86_64.rpm
kernel-debuginfo-2.6.18-371.1.2.el5.x86_64.rpm
kernel-debuginfo-common-2.6.18-371.1.2.el5.x86_64.rpm
kernel-devel-2.6.18-371.1.2.el5.x86_64.rpm
kernel-headers-2.6.18-371.1.2.el5.x86_64.rpm
kernel-xen-2.6.18-371.1.2.el5.x86_64.rpm
kernel-xen-debuginfo-2.6.18-371.1.2.el5.x86_64.rpm
kernel-xen-devel-2.6.18-371.1.2.el5.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/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2013-0343.html
https://www.redhat.com/security/data/cve/CVE-2013-4299.html
https://www.redhat.com/security/data/cve/CVE-2013-4345.html
https://www.redhat.com/security/data/cve/CVE-2013-4368.html
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

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

Copyright 2013 Red Hat, Inc.
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