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Red Hat Security Advisory 2014-0772-01

Red Hat Security Advisory 2014-0772-01
Posted Jun 19, 2014
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2014-0772-01 - 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 floppy driver handled user space provided data in certain error code paths while processing FDRAWCMD IOCTL commands. A local user with write access to /dev/fdX could use this flaw to free (using the kfree() function) arbitrary kernel memory. It was found that the Linux kernel's floppy driver leaked internal kernel memory addresses to user space during the processing of the FDRAWCMD IOCTL command. A local user with write access to /dev/fdX could use this flaw to obtain information about the kernel heap arrangement.

tags | advisory, arbitrary, kernel, local
systems | linux, redhat
advisories | CVE-2012-6638, CVE-2014-1737, CVE-2014-1738
MD5 | 9c02f9c96f505ab6b0befdb86b60273c

Red Hat Security Advisory 2014-0772-01

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

Synopsis: Important: kernel security and bug fix update
Advisory ID: RHSA-2014:0772-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2014-0772.html
Issue date: 2014-06-19
CVE Names: CVE-2012-6638 CVE-2014-1737 CVE-2014-1738
=====================================================================

1. Summary:

Updated kernel packages that fix three security issues and two bugs are now
available for Red Hat Enterprise Linux 5.9 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 EUS (v. 5.9 server) - i386, ia64, noarch, ppc, s390x, 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 floppy driver handled user
space provided data in certain error code paths while processing FDRAWCMD
IOCTL commands. A local user with write access to /dev/fdX could use this
flaw to free (using the kfree() function) arbitrary kernel memory.
(CVE-2014-1737, Important)

* It was found that the Linux kernel's floppy driver leaked internal kernel
memory addresses to user space during the processing of the FDRAWCMD IOCTL
command. A local user with write access to /dev/fdX could use this flaw to
obtain information about the kernel heap arrangement. (CVE-2014-1738, Low)

Note: A local user with write access to /dev/fdX could use these two flaws
(CVE-2014-1737 in combination with CVE-2014-1738) to escalate their
privileges on the system.

* A flaw was found in the way the Linux kernel's TCP/IP protocol suite
implementation handled TCP packets with both the SYN and FIN flags set.
A remote attacker could use this flaw to consume an excessive amount of
resources on the target system, potentially resulting in a denial of
service. (CVE-2012-6638, Moderate)

Red Hat would like to thank Matthew Daley for reporting CVE-2014-1737 and
CVE-2014-1738.

This update also fixes the following bugs:

* While under heavy load, some Fibre Channel storage devices, such as
Hitachi and HP Open-V series, can send a logout (LOGO) message to the host
system. However, due to a bug in the lpfc driver, this could result in a
loss of active paths to the storage and the paths could not be recovered
without manual intervention. This update corrects the lpfc driver to ensure
automatic recovery of the lost paths to the storage in this scenario.
(BZ#1096060)

* A bug in the futex system call could result in an overflow when passing a
very large positive timeout. As a consequence, the FUTEX_WAIT operation did
not work as intended and the system call was timing out immediately.
A backported patch fixes this bug by limiting very large positive timeouts
to the maximal supported value. (BZ#1091831)

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/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 (https://bugzilla.redhat.com/):

1066055 - CVE-2012-6638 Kernel: net: tcp: potential DoS via SYN+FIN messages
1094299 - CVE-2014-1737 CVE-2014-1738 kernel: block: floppy: privilege escalation via FDRAWCMD floppy ioctl command

6. Package List:

Red Hat Enterprise Linux EUS (v. 5.9 server):

Source:
kernel-2.6.18-348.27.1.el5.src.rpm

i386:
kernel-2.6.18-348.27.1.el5.i686.rpm
kernel-PAE-2.6.18-348.27.1.el5.i686.rpm
kernel-PAE-debuginfo-2.6.18-348.27.1.el5.i686.rpm
kernel-PAE-devel-2.6.18-348.27.1.el5.i686.rpm
kernel-debug-2.6.18-348.27.1.el5.i686.rpm
kernel-debug-debuginfo-2.6.18-348.27.1.el5.i686.rpm
kernel-debug-devel-2.6.18-348.27.1.el5.i686.rpm
kernel-debuginfo-2.6.18-348.27.1.el5.i686.rpm
kernel-debuginfo-common-2.6.18-348.27.1.el5.i686.rpm
kernel-devel-2.6.18-348.27.1.el5.i686.rpm
kernel-headers-2.6.18-348.27.1.el5.i386.rpm
kernel-xen-2.6.18-348.27.1.el5.i686.rpm
kernel-xen-debuginfo-2.6.18-348.27.1.el5.i686.rpm
kernel-xen-devel-2.6.18-348.27.1.el5.i686.rpm

ia64:
kernel-2.6.18-348.27.1.el5.ia64.rpm
kernel-debug-2.6.18-348.27.1.el5.ia64.rpm
kernel-debug-debuginfo-2.6.18-348.27.1.el5.ia64.rpm
kernel-debug-devel-2.6.18-348.27.1.el5.ia64.rpm
kernel-debuginfo-2.6.18-348.27.1.el5.ia64.rpm
kernel-debuginfo-common-2.6.18-348.27.1.el5.ia64.rpm
kernel-devel-2.6.18-348.27.1.el5.ia64.rpm
kernel-headers-2.6.18-348.27.1.el5.ia64.rpm
kernel-xen-2.6.18-348.27.1.el5.ia64.rpm
kernel-xen-debuginfo-2.6.18-348.27.1.el5.ia64.rpm
kernel-xen-devel-2.6.18-348.27.1.el5.ia64.rpm

noarch:
kernel-doc-2.6.18-348.27.1.el5.noarch.rpm

ppc:
kernel-2.6.18-348.27.1.el5.ppc64.rpm
kernel-debug-2.6.18-348.27.1.el5.ppc64.rpm
kernel-debug-debuginfo-2.6.18-348.27.1.el5.ppc64.rpm
kernel-debug-devel-2.6.18-348.27.1.el5.ppc64.rpm
kernel-debuginfo-2.6.18-348.27.1.el5.ppc64.rpm
kernel-debuginfo-common-2.6.18-348.27.1.el5.ppc64.rpm
kernel-devel-2.6.18-348.27.1.el5.ppc64.rpm
kernel-headers-2.6.18-348.27.1.el5.ppc.rpm
kernel-headers-2.6.18-348.27.1.el5.ppc64.rpm
kernel-kdump-2.6.18-348.27.1.el5.ppc64.rpm
kernel-kdump-debuginfo-2.6.18-348.27.1.el5.ppc64.rpm
kernel-kdump-devel-2.6.18-348.27.1.el5.ppc64.rpm

s390x:
kernel-2.6.18-348.27.1.el5.s390x.rpm
kernel-debug-2.6.18-348.27.1.el5.s390x.rpm
kernel-debug-debuginfo-2.6.18-348.27.1.el5.s390x.rpm
kernel-debug-devel-2.6.18-348.27.1.el5.s390x.rpm
kernel-debuginfo-2.6.18-348.27.1.el5.s390x.rpm
kernel-debuginfo-common-2.6.18-348.27.1.el5.s390x.rpm
kernel-devel-2.6.18-348.27.1.el5.s390x.rpm
kernel-headers-2.6.18-348.27.1.el5.s390x.rpm
kernel-kdump-2.6.18-348.27.1.el5.s390x.rpm
kernel-kdump-debuginfo-2.6.18-348.27.1.el5.s390x.rpm
kernel-kdump-devel-2.6.18-348.27.1.el5.s390x.rpm

x86_64:
kernel-2.6.18-348.27.1.el5.x86_64.rpm
kernel-debug-2.6.18-348.27.1.el5.x86_64.rpm
kernel-debug-debuginfo-2.6.18-348.27.1.el5.x86_64.rpm
kernel-debug-devel-2.6.18-348.27.1.el5.x86_64.rpm
kernel-debuginfo-2.6.18-348.27.1.el5.x86_64.rpm
kernel-debuginfo-common-2.6.18-348.27.1.el5.x86_64.rpm
kernel-devel-2.6.18-348.27.1.el5.x86_64.rpm
kernel-headers-2.6.18-348.27.1.el5.x86_64.rpm
kernel-xen-2.6.18-348.27.1.el5.x86_64.rpm
kernel-xen-debuginfo-2.6.18-348.27.1.el5.x86_64.rpm
kernel-xen-devel-2.6.18-348.27.1.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-2012-6638.html
https://www.redhat.com/security/data/cve/CVE-2014-1737.html
https://www.redhat.com/security/data/cve/CVE-2014-1738.html
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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