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[RHSA-2013:1026-01] Important: kernel security and bug fix update

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Red Hat Security Advisory

 

Synopsis: Important: kernel security and bug fix update

Advisory ID: RHSA-2013:1026-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2013-1026.html

Issue date: 2013-07-09

CVE Names: 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 6.2 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. 6.2) - i386, noarch, ppc64, s390x, x86_64

Red Hat Enterprise Linux Server Optional EUS (v. 6.2) - 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 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 (Kernel-based Virtual Machine) 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)

 

* 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

CVE-2013-1796, CVE-2013-1797, and CVE-2013-1798.

 

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/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/):

 

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. 6.2):

 

Source:

kernel-2.6.32-220.39.1.el6.src.rpm

 

i386:

kernel-2.6.32-220.39.1.el6.i686.rpm

kernel-debug-2.6.32-220.39.1.el6.i686.rpm

kernel-debug-debuginfo-2.6.32-220.39.1.el6.i686.rpm

kernel-debug-devel-2.6.32-220.39.1.el6.i686.rpm

kernel-debuginfo-2.6.32-220.39.1.el6.i686.rpm

kernel-debuginfo-common-i686-2.6.32-220.39.1.el6.i686.rpm

kernel-devel-2.6.32-220.39.1.el6.i686.rpm

kernel-headers-2.6.32-220.39.1.el6.i686.rpm

perf-2.6.32-220.39.1.el6.i686.rpm

perf-debuginfo-2.6.32-220.39.1.el6.i686.rpm

python-perf-debuginfo-2.6.32-220.39.1.el6.i686.rpm

 

noarch:

kernel-doc-2.6.32-220.39.1.el6.noarch.rpm

kernel-firmware-2.6.32-220.39.1.el6.noarch.rpm

 

ppc64:

kernel-2.6.32-220.39.1.el6.ppc64.rpm

kernel-bootwrapper-2.6.32-220.39.1.el6.ppc64.rpm

kernel-debug-2.6.32-220.39.1.el6.ppc64.rpm

kernel-debug-debuginfo-2.6.32-220.39.1.el6.ppc64.rpm

kernel-debug-devel-2.6.32-220.39.1.el6.ppc64.rpm

kernel-debuginfo-2.6.32-220.39.1.el6.ppc64.rpm

kernel-debuginfo-common-ppc64-2.6.32-220.39.1.el6.ppc64.rpm

kernel-devel-2.6.32-220.39.1.el6.ppc64.rpm

kernel-headers-2.6.32-220.39.1.el6.ppc64.rpm

perf-2.6.32-220.39.1.el6.ppc64.rpm

perf-debuginfo-2.6.32-220.39.1.el6.ppc64.rpm

python-perf-debuginfo-2.6.32-220.39.1.el6.ppc64.rpm

 

s390x:

kernel-2.6.32-220.39.1.el6.s390x.rpm

kernel-debug-2.6.32-220.39.1.el6.s390x.rpm

kernel-debug-debuginfo-2.6.32-220.39.1.el6.s390x.rpm

kernel-debug-devel-2.6.32-220.39.1.el6.s390x.rpm

kernel-debuginfo-2.6.32-220.39.1.el6.s390x.rpm

kernel-debuginfo-common-s390x-2.6.32-220.39.1.el6.s390x.rpm

kernel-devel-2.6.32-220.39.1.el6.s390x.rpm

kernel-headers-2.6.32-220.39.1.el6.s390x.rpm

kernel-kdump-2.6.32-220.39.1.el6.s390x.rpm

kernel-kdump-debuginfo-2.6.32-220.39.1.el6.s390x.rpm

kernel-kdump-devel-2.6.32-220.39.1.el6.s390x.rpm

perf-2.6.32-220.39.1.el6.s390x.rpm

perf-debuginfo-2.6.32-220.39.1.el6.s390x.rpm

python-perf-debuginfo-2.6.32-220.39.1.el6.s390x.rpm

 

x86_64:

kernel-2.6.32-220.39.1.el6.x86_64.rpm

kernel-debug-2.6.32-220.39.1.el6.x86_64.rpm

kernel-debug-debuginfo-2.6.32-220.39.1.el6.x86_64.rpm

kernel-debug-devel-2.6.32-220.39.1.el6.x86_64.rpm

kernel-debuginfo-2.6.32-220.39.1.el6.x86_64.rpm

kernel-debuginfo-common-x86_64-2.6.32-220.39.1.el6.x86_64.rpm

kernel-devel-2.6.32-220.39.1.el6.x86_64.rpm

kernel-headers-2.6.32-220.39.1.el6.x86_64.rpm

perf-2.6.32-220.39.1.el6.x86_64.rpm

perf-debuginfo-2.6.32-220.39.1.el6.x86_64.rpm

python-perf-debuginfo-2.6.32-220.39.1.el6.x86_64.rpm

 

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

 

Source:

kernel-2.6.32-220.39.1.el6.src.rpm

 

i386:

kernel-debug-debuginfo-2.6.32-220.39.1.el6.i686.rpm

kernel-debuginfo-2.6.32-220.39.1.el6.i686.rpm

kernel-debuginfo-common-i686-2.6.32-220.39.1.el6.i686.rpm

perf-debuginfo-2.6.32-220.39.1.el6.i686.rpm

python-perf-2.6.32-220.39.1.el6.i686.rpm

python-perf-debuginfo-2.6.32-220.39.1.el6.i686.rpm

 

ppc64:

kernel-debug-debuginfo-2.6.32-220.39.1.el6.ppc64.rpm

kernel-debuginfo-2.6.32-220.39.1.el6.ppc64.rpm

kernel-debuginfo-common-ppc64-2.6.32-220.39.1.el6.ppc64.rpm

perf-debuginfo-2.6.32-220.39.1.el6.ppc64.rpm

python-perf-2.6.32-220.39.1.el6.ppc64.rpm

python-perf-debuginfo-2.6.32-220.39.1.el6.ppc64.rpm

 

s390x:

kernel-debug-debuginfo-2.6.32-220.39.1.el6.s390x.rpm

kernel-debuginfo-2.6.32-220.39.1.el6.s390x.rpm

kernel-debuginfo-common-s390x-2.6.32-220.39.1.el6.s390x.rpm

kernel-kdump-debuginfo-2.6.32-220.39.1.el6.s390x.rpm

perf-debuginfo-2.6.32-220.39.1.el6.s390x.rpm

python-perf-2.6.32-220.39.1.el6.s390x.rpm

python-perf-debuginfo-2.6.32-220.39.1.el6.s390x.rpm

 

x86_64:

kernel-debug-debuginfo-2.6.32-220.39.1.el6.x86_64.rpm

kernel-debuginfo-2.6.32-220.39.1.el6.x86_64.rpm

kernel-debuginfo-common-x86_64-2.6.32-220.39.1.el6.x86_64.rpm

perf-debuginfo-2.6.32-220.39.1.el6.x86_64.rpm

python-perf-2.6.32-220.39.1.el6.x86_64.rpm

python-perf-debuginfo-2.6.32-220.39.1.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-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/6.2_Technical_Notes/kernel.html

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2013 Red Hat, Inc.

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