[RHSA-2012:1540-01] Important: kernel security, bug fix, and enhancement update

[news 28]

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Red Hat Security Advisory

 

Synopsis: Important: kernel security, bug fix, and enhancement update

Advisory ID: RHSA-2012:1540-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2012-1540.html

Issue date: 2012-12-04

CVE Names: CVE-2012-2372 CVE-2012-3552 CVE-2012-4508

CVE-2012-4535 CVE-2012-4537 CVE-2012-5513

=====================================================================

 

1. Summary:

 

Updated kernel packages that fix multiple security issues, two bugs, and

add two enhancements are now available for Red Hat Enterprise Linux 5.

 

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 (v. 5 server) - i386, ia64, noarch, ppc, s390x, x86_64

Red Hat Enterprise Linux Desktop (v. 5 client) - i386, noarch, x86_64

 

3. Description:

 

These packages contain the Linux kernel.

 

Security fixes:

 

* A race condition in the way asynchronous I/O and fallocate() interacted

when using ext4 could allow a local, unprivileged user to obtain random

data from a deleted file. (CVE-2012-4508, Important)

 

* A flaw in the way the Xen hypervisor implementation range checked guest

provided addresses in the XENMEM_exchange hypercall could allow a

malicious, para-virtualized guest administrator to crash the hypervisor or,

potentially, escalate their privileges, allowing them to execute arbitrary

code at the hypervisor level. (CVE-2012-5513, Important)

 

* A flaw in the Reliable Datagram Sockets (RDS) protocol implementation

could allow a local, unprivileged user to cause a denial of service.

(CVE-2012-2372, Moderate)

 

* A race condition in the way access to inet->opt ip_options was

synchronized in the Linux kernel's TCP/IP protocol suite implementation.

Depending on the network facing applications running on the system, a

remote attacker could possibly trigger this flaw to cause a denial of

service. A local, unprivileged user could use this flaw to cause a denial

of service regardless of the applications the system runs. (CVE-2012-3552,

Moderate)

 

* The Xen hypervisor implementation did not properly restrict the period

values used to initialize per VCPU periodic timers. A privileged guest user

could cause an infinite loop on the physical CPU. If the watchdog were

enabled, it would detect said loop and panic the host system.

(CVE-2012-4535, Moderate)

 

* A flaw in the way the Xen hypervisor implementation handled

set_p2m_entry() error conditions could allow a privileged,

fully-virtualized guest user to crash the hypervisor. (CVE-2012-4537,

Moderate)

 

Red Hat would like to thank Theodore Ts'o for reporting CVE-2012-4508; the

Xen project for reporting CVE-2012-5513, CVE-2012-4535, and CVE-2012-4537;

and Hafid Lin for reporting CVE-2012-3552. Upstream acknowledges Dmitry

Monakhov as the original reporter of CVE-2012-4508. CVE-2012-2372 was

discovered by Li Honggang of Red Hat.

 

Bug fixes:

 

* Previously, the interrupt handlers of the qla2xxx driver could clear

pending interrupts right after the IRQ lines were attached during system

start-up. Consequently, the kernel could miss the interrupt that reported

completion of the link initialization, and the qla2xxx driver then failed

to detect all attached LUNs. With this update, the qla2xxx driver has been

modified to no longer clear interrupt bits after attaching the IRQ lines.

The driver now correctly detects all attached LUNs as expected. (BZ#870118)

 

* The Ethernet channel bonding driver reported the MII (Media Independent

Interface) status of the bond interface in 802.3ad mode as being up even

though the MII status of all of the slave devices was down. This could pose

a problem if the MII status of the bond interface was used to determine if

failover should occur. With this update, the agg_device_up() function has

been added to the bonding driver, which allows the driver to report the

link status of the bond interface correctly, that is, down when all of its

slaves are down, in the 802.3ad mode. (BZ#877943)

 

Enhancements:

 

* This update backports several changes from the latest upstream version of

the bnx2x driver. The most important change, the remote-fault link

detection feature, allows the driver to periodically scan the physical link

layer for remote faults. If the physical link appears to be up and a fault

is detected, the driver indicates that the link is down. When the fault is

cleared, the driver indicates that the link is up again. (BZ#870120)

 

* The INET socket interface has been modified to send a warning message

when the ip_options structure is allocated directly by a third-party module

using the kmalloc() function. (BZ#874973)

 

Users should upgrade to these updated packages, which contain backported

patches to correct these issues and add these enhancements. 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/):

 

822754 - CVE-2012-2372 kernel: rds-ping cause kernel panic

853465 - CVE-2012-3552 kernel: net: slab corruption due to improper synchronization around inet->opt

869904 - CVE-2012-4508 kernel: ext4: AIO vs fallocate stale data exposure

870086 - CVE-2012-4535 kernel: xen: VCPU timer overflow leads to PCPU deadlock and host death-by-watchdog

870101 - CVE-2012-4537 kernel: xen: Memory mapping failure can crash Xen

874973 - net: WARN if struct ip_options was allocated directly by kmalloc [rhel-5.8.z]

877391 - CVE-2012-5513 kernel: xen: XENMEM_exchange may overwrite hypervisor memory

 

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-2.6.18-308.24.1.el5.src.rpm

 

i386:

kernel-2.6.18-308.24.1.el5.i686.rpm

kernel-PAE-2.6.18-308.24.1.el5.i686.rpm

kernel-PAE-debuginfo-2.6.18-308.24.1.el5.i686.rpm

kernel-PAE-devel-2.6.18-308.24.1.el5.i686.rpm

kernel-debug-2.6.18-308.24.1.el5.i686.rpm

kernel-debug-debuginfo-2.6.18-308.24.1.el5.i686.rpm

kernel-debug-devel-2.6.18-308.24.1.el5.i686.rpm

kernel-debuginfo-2.6.18-308.24.1.el5.i686.rpm

kernel-debuginfo-common-2.6.18-308.24.1.el5.i686.rpm

kernel-devel-2.6.18-308.24.1.el5.i686.rpm

kernel-headers-2.6.18-308.24.1.el5.i386.rpm

kernel-xen-2.6.18-308.24.1.el5.i686.rpm

kernel-xen-debuginfo-2.6.18-308.24.1.el5.i686.rpm

kernel-xen-devel-2.6.18-308.24.1.el5.i686.rpm

 

noarch:

kernel-doc-2.6.18-308.24.1.el5.noarch.rpm

 

x86_64:

kernel-2.6.18-308.24.1.el5.x86_64.rpm

kernel-debug-2.6.18-308.24.1.el5.x86_64.rpm

kernel-debug-debuginfo-2.6.18-308.24.1.el5.x86_64.rpm

kernel-debug-devel-2.6.18-308.24.1.el5.x86_64.rpm

kernel-debuginfo-2.6.18-308.24.1.el5.x86_64.rpm

kernel-debuginfo-common-2.6.18-308.24.1.el5.x86_64.rpm

kernel-devel-2.6.18-308.24.1.el5.x86_64.rpm

kernel-headers-2.6.18-308.24.1.el5.x86_64.rpm

kernel-xen-2.6.18-308.24.1.el5.x86_64.rpm

kernel-xen-debuginfo-2.6.18-308.24.1.el5.x86_64.rpm

kernel-xen-devel-2.6.18-308.24.1.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-2.6.18-308.24.1.el5.src.rpm

 

i386:

kernel-2.6.18-308.24.1.el5.i686.rpm

kernel-PAE-2.6.18-308.24.1.el5.i686.rpm

kernel-PAE-debuginfo-2.6.18-308.24.1.el5.i686.rpm

kernel-PAE-devel-2.6.18-308.24.1.el5.i686.rpm

kernel-debug-2.6.18-308.24.1.el5.i686.rpm

kernel-debug-debuginfo-2.6.18-308.24.1.el5.i686.rpm

kernel-debug-devel-2.6.18-308.24.1.el5.i686.rpm

kernel-debuginfo-2.6.18-308.24.1.el5.i686.rpm

kernel-debuginfo-common-2.6.18-308.24.1.el5.i686.rpm

kernel-devel-2.6.18-308.24.1.el5.i686.rpm

kernel-headers-2.6.18-308.24.1.el5.i386.rpm

kernel-xen-2.6.18-308.24.1.el5.i686.rpm

kernel-xen-debuginfo-2.6.18-308.24.1.el5.i686.rpm

kernel-xen-devel-2.6.18-308.24.1.el5.i686.rpm

 

ia64:

kernel-2.6.18-308.24.1.el5.ia64.rpm

kernel-debug-2.6.18-308.24.1.el5.ia64.rpm

kernel-debug-debuginfo-2.6.18-308.24.1.el5.ia64.rpm

kernel-debug-devel-2.6.18-308.24.1.el5.ia64.rpm

kernel-debuginfo-2.6.18-308.24.1.el5.ia64.rpm

kernel-debuginfo-common-2.6.18-308.24.1.el5.ia64.rpm

kernel-devel-2.6.18-308.24.1.el5.ia64.rpm

kernel-headers-2.6.18-308.24.1.el5.ia64.rpm

kernel-xen-2.6.18-308.24.1.el5.ia64.rpm

kernel-xen-debuginfo-2.6.18-308.24.1.el5.ia64.rpm

kernel-xen-devel-2.6.18-308.24.1.el5.ia64.rpm

 

noarch:

kernel-doc-2.6.18-308.24.1.el5.noarch.rpm

 

ppc:

kernel-2.6.18-308.24.1.el5.ppc64.rpm

kernel-debug-2.6.18-308.24.1.el5.ppc64.rpm

kernel-debug-debuginfo-2.6.18-308.24.1.el5.ppc64.rpm

kernel-debug-devel-2.6.18-308.24.1.el5.ppc64.rpm

kernel-debuginfo-2.6.18-308.24.1.el5.ppc64.rpm

kernel-debuginfo-common-2.6.18-308.24.1.el5.ppc64.rpm

kernel-devel-2.6.18-308.24.1.el5.ppc64.rpm

kernel-headers-2.6.18-308.24.1.el5.ppc.rpm

kernel-headers-2.6.18-308.24.1.el5.ppc64.rpm

kernel-kdump-2.6.18-308.24.1.el5.ppc64.rpm

kernel-kdump-debuginfo-2.6.18-308.24.1.el5.ppc64.rpm

kernel-kdump-devel-2.6.18-308.24.1.el5.ppc64.rpm

 

s390x:

kernel-2.6.18-308.24.1.el5.s390x.rpm

kernel-debug-2.6.18-308.24.1.el5.s390x.rpm

kernel-debug-debuginfo-2.6.18-308.24.1.el5.s390x.rpm

kernel-debug-devel-2.6.18-308.24.1.el5.s390x.rpm

kernel-debuginfo-2.6.18-308.24.1.el5.s390x.rpm

kernel-debuginfo-common-2.6.18-308.24.1.el5.s390x.rpm

kernel-devel-2.6.18-308.24.1.el5.s390x.rpm

kernel-headers-2.6.18-308.24.1.el5.s390x.rpm

kernel-kdump-2.6.18-308.24.1.el5.s390x.rpm

kernel-kdump-debuginfo-2.6.18-308.24.1.el5.s390x.rpm

kernel-kdump-devel-2.6.18-308.24.1.el5.s390x.rpm

 

x86_64:

kernel-2.6.18-308.24.1.el5.x86_64.rpm

kernel-debug-2.6.18-308.24.1.el5.x86_64.rpm

kernel-debug-debuginfo-2.6.18-308.24.1.el5.x86_64.rpm

kernel-debug-devel-2.6.18-308.24.1.el5.x86_64.rpm

kernel-debuginfo-2.6.18-308.24.1.el5.x86_64.rpm

kernel-debuginfo-common-2.6.18-308.24.1.el5.x86_64.rpm

kernel-devel-2.6.18-308.24.1.el5.x86_64.rpm

kernel-headers-2.6.18-308.24.1.el5.x86_64.rpm

kernel-xen-2.6.18-308.24.1.el5.x86_64.rpm

kernel-xen-debuginfo-2.6.18-308.24.1.el5.x86_64.rpm

kernel-xen-devel-2.6.18-308.24.1.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-2012-2372.html

https://www.redhat.com/security/data/cve/CVE-2012-3552.html

https://www.redhat.com/security/data/cve/CVE-2012-4508.html

https://www.redhat.com/security/data/cve/CVE-2012-4535.html

https://www.redhat.com/security/data/cve/CVE-2012-4537.html

https://www.redhat.com/security/data/cve/CVE-2012-5513.html

https://access.redhat.com/security/updates/classification/#important

 

8. Contact:

 

The Red Hat security contact is . More contact

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

 

Copyright 2012 Red Hat, Inc.

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