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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: kernel security and bug fix update
Advisory ID:       RHSA-2013:0928-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2013-0928.html
Issue date:        2013-06-11
CVE Names:         CVE-2012-4542 CVE-2013-0311 CVE-2013-1767 
                   CVE-2013-1773 CVE-2013-1796 CVE-2013-1797 
                   CVE-2013-1798 CVE-2013-1848 
=====================================================================

1. Summary:

Updated kernel packages that fix multiple security issues and several bugs
are now available for Red Hat Enterprise Linux 6.3 Extended Update Support.

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.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Server EUS (v. 6.3) - i386, noarch, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional EUS (v. 6.3) - i386, ppc64, s390x, x86_64

3. 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 vhost kernel module handled descriptors
that spanned multiple regions. A privileged guest user in a KVM
(Kernel-based Virtual Machine) guest could use this flaw to crash the host
or, potentially, escalate their privileges on the host. (CVE-2013-0311,
Important)

* A buffer overflow flaw was found in the way UTF-8 characters were
converted to UTF-16 in the utf8s_to_utf16s() function of the Linux kernel's
FAT file system implementation. A local user able to mount a FAT file
system with the "utf8=1" option could use this flaw to crash the system or,
potentially, to escalate their privileges. (CVE-2013-1773, Important)

* A flaw was found in the way KVM handled guest time updates when the
buffer the guest registered by writing to the MSR_KVM_SYSTEM_TIME machine
state register (MSR) crossed a page boundary. A privileged guest user could
use this flaw to crash the host or, potentially, escalate their privileges,
allowing them to execute arbitrary code at the host kernel level.
(CVE-2013-1796, Important)

* A potential use-after-free flaw was found in the way KVM handled guest
time updates when the GPA (guest physical address) the guest registered by
writing to the MSR_KVM_SYSTEM_TIME machine state register (MSR) fell into a
movable or removable memory region of the hosting user-space process (by
default, QEMU-KVM) on the host. If that memory region is deregistered from
KVM using KVM_SET_USER_MEMORY_REGION and the allocated virtual memory
reused, a privileged guest user could potentially use this flaw to escalate
their privileges on the host. (CVE-2013-1797, Important)

* A flaw was found in the way KVM emulated IOAPIC (I/O Advanced
Programmable Interrupt Controller). A missing validation check in the
ioapic_read_indirect() function could allow a privileged guest user to
crash the host, or read a substantial portion of host kernel memory.
(CVE-2013-1798, Important)

* It was found that the default SCSI command filter does not accommodate
commands that overlap across device classes. A privileged guest user could
potentially use this flaw to write arbitrary data to a LUN that is
passed-through as read-only. (CVE-2012-4542, Moderate)

* A use-after-free flaw was found in the tmpfs implementation. A local user
able to mount and unmount a tmpfs file system could use this flaw to cause
a denial of service or, potentially, escalate their privileges.
(CVE-2013-1767, Low)

* A format string flaw was found in the ext3_msg() function in the Linux
kernel's ext3 file system implementation. A local user who is able to mount
an ext3 file system could use this flaw to cause a denial of service or,
potentially, escalate their privileges. (CVE-2013-1848, Low)

Red Hat would like to thank Andrew Honig of Google for reporting the
CVE-2013-1796, CVE-2013-1797, and CVE-2013-1798 issues. The CVE-2012-4542
issue was discovered by Paolo Bonzini of Red Hat.

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.

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/knowledge/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/):

875360 - CVE-2012-4542 kernel: block: default SCSI command filter does not accomodate commands overlap across device classes
912905 - CVE-2013-0311 kernel: vhost: fix length for cross region descriptor
915592 - CVE-2013-1767 Kernel: tmpfs: fix use-after-free of mempolicy object
916115 - CVE-2013-1773 kernel: VFAT slab-based buffer overflow
917012 - CVE-2013-1796 kernel: kvm: buffer overflow in handling of MSR_KVM_SYSTEM_TIME
917013 - CVE-2013-1797 kernel: kvm: after free issue with the handling of MSR_KVM_SYSTEM_TIME
917017 - CVE-2013-1798 kernel: kvm: out-of-bounds access in ioapic indirect register reads
920783 - CVE-2013-1848 kernel: ext3: format string issues

6. Package List:

Red Hat Enterprise Linux Server EUS (v. 6.3):

Source:
kernel-2.6.32-279.31.1.el6.src.rpm

i386:
kernel-2.6.32-279.31.1.el6.i686.rpm
kernel-debug-2.6.32-279.31.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-279.31.1.el6.i686.rpm
kernel-debug-devel-2.6.32-279.31.1.el6.i686.rpm
kernel-debuginfo-2.6.32-279.31.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-279.31.1.el6.i686.rpm
kernel-devel-2.6.32-279.31.1.el6.i686.rpm
kernel-headers-2.6.32-279.31.1.el6.i686.rpm
perf-2.6.32-279.31.1.el6.i686.rpm
perf-debuginfo-2.6.32-279.31.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-279.31.1.el6.i686.rpm

noarch:
kernel-doc-2.6.32-279.31.1.el6.noarch.rpm
kernel-firmware-2.6.32-279.31.1.el6.noarch.rpm

ppc64:
kernel-2.6.32-279.31.1.el6.ppc64.rpm
kernel-bootwrapper-2.6.32-279.31.1.el6.ppc64.rpm
kernel-debug-2.6.32-279.31.1.el6.ppc64.rpm
kernel-debug-debuginfo-2.6.32-279.31.1.el6.ppc64.rpm
kernel-debug-devel-2.6.32-279.31.1.el6.ppc64.rpm
kernel-debuginfo-2.6.32-279.31.1.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-279.31.1.el6.ppc64.rpm
kernel-devel-2.6.32-279.31.1.el6.ppc64.rpm
kernel-headers-2.6.32-279.31.1.el6.ppc64.rpm
perf-2.6.32-279.31.1.el6.ppc64.rpm
perf-debuginfo-2.6.32-279.31.1.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-279.31.1.el6.ppc64.rpm

s390x:
kernel-2.6.32-279.31.1.el6.s390x.rpm
kernel-debug-2.6.32-279.31.1.el6.s390x.rpm
kernel-debug-debuginfo-2.6.32-279.31.1.el6.s390x.rpm
kernel-debug-devel-2.6.32-279.31.1.el6.s390x.rpm
kernel-debuginfo-2.6.32-279.31.1.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-279.31.1.el6.s390x.rpm
kernel-devel-2.6.32-279.31.1.el6.s390x.rpm
kernel-headers-2.6.32-279.31.1.el6.s390x.rpm
kernel-kdump-2.6.32-279.31.1.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-279.31.1.el6.s390x.rpm
kernel-kdump-devel-2.6.32-279.31.1.el6.s390x.rpm
perf-2.6.32-279.31.1.el6.s390x.rpm
perf-debuginfo-2.6.32-279.31.1.el6.s390x.rpm
python-perf-debuginfo-2.6.32-279.31.1.el6.s390x.rpm

x86_64:
kernel-2.6.32-279.31.1.el6.x86_64.rpm
kernel-debug-2.6.32-279.31.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-279.31.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-279.31.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-279.31.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-279.31.1.el6.x86_64.rpm
kernel-devel-2.6.32-279.31.1.el6.x86_64.rpm
kernel-headers-2.6.32-279.31.1.el6.x86_64.rpm
perf-2.6.32-279.31.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-279.31.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-279.31.1.el6.x86_64.rpm

Red Hat Enterprise Linux Server Optional EUS (v. 6.3):

Source:
kernel-2.6.32-279.31.1.el6.src.rpm

i386:
kernel-debug-debuginfo-2.6.32-279.31.1.el6.i686.rpm
kernel-debuginfo-2.6.32-279.31.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-279.31.1.el6.i686.rpm
perf-debuginfo-2.6.32-279.31.1.el6.i686.rpm
python-perf-2.6.32-279.31.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-279.31.1.el6.i686.rpm

ppc64:
kernel-debug-debuginfo-2.6.32-279.31.1.el6.ppc64.rpm
kernel-debuginfo-2.6.32-279.31.1.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-279.31.1.el6.ppc64.rpm
perf-debuginfo-2.6.32-279.31.1.el6.ppc64.rpm
python-perf-2.6.32-279.31.1.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-279.31.1.el6.ppc64.rpm

s390x:
kernel-debug-debuginfo-2.6.32-279.31.1.el6.s390x.rpm
kernel-debuginfo-2.6.32-279.31.1.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-279.31.1.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-279.31.1.el6.s390x.rpm
perf-debuginfo-2.6.32-279.31.1.el6.s390x.rpm
python-perf-2.6.32-279.31.1.el6.s390x.rpm
python-perf-debuginfo-2.6.32-279.31.1.el6.s390x.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-279.31.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-279.31.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-279.31.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-279.31.1.el6.x86_64.rpm
python-perf-2.6.32-279.31.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-279.31.1.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/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2012-4542.html
https://www.redhat.com/security/data/cve/CVE-2013-0311.html
https://www.redhat.com/security/data/cve/CVE-2013-1767.html
https://www.redhat.com/security/data/cve/CVE-2013-1773.html
https://www.redhat.com/security/data/cve/CVE-2013-1796.html
https://www.redhat.com/security/data/cve/CVE-2013-1797.html
https://www.redhat.com/security/data/cve/CVE-2013-1798.html
https://www.redhat.com/security/data/cve/CVE-2013-1848.html
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.3_Technical_Notes/kernel.html

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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