RHEL 6 : kernel (RHSA-2015:0043)

This script is Copyright (C) 2015-2017 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

Updated kernel packages that fix three security issues and several
bugs are now available for Red Hat Enterprise Linux 6.4 Extended
Update Support.

Red Hat Product Security 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.

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 SCTP implementation
handled malformed or duplicate Address Configuration Change Chunks
(ASCONF). A remote attacker could use either of these flaws to crash
the system. (CVE-2014-3673, CVE-2014-3687, Important)

* A flaw was found in the way the Linux kernel's SCTP implementation
handled the association's output queue. A remote attacker could send
specially crafted packets that would cause the system to use an
excessive amount of memory, leading to a denial of service.
(CVE-2014-3688, Important)

The CVE-2014-3673 issue was discovered by Liu Wei of Red Hat.

This update also fixes the following bugs :

* When the Baseboard Management Controller (BMC) was reset, the
settings for the ipmi_watchdog driver were not restored correctly
causing error 80 to be returned. With this update, Intelligent
Platform Management Interface (IPMI) is reset as expected in the
described situation, and the error is no longer returned. (BZ#1109268)

* Under certain conditions, XFS log flushes could exceed the kernel
thread stack size. As a consequence, a kernel panic occurred on
systems using XFS file systems. This update provides a patch that
moves this code path to a work queue, and therefore the stack overflow
no longer occurs. (BZ#1154086)

* Due to a race condition, an attempt to unmount an XFS file system
using the umount command could fail, causing the system to become
unresponsive. The underlying source code has been modified to fix this
bug, and the system no longer hangs in the described situation.
(BZ#1158320)

* Previously, the printk_ratelimited() function printed messages which
were supposed to be suppressed, and failed to print messages that were
supposed to be printed. This was caused by the incorrect usage of the
__ratelimit() function. This bug has been fixed with this update, and
now printk_ratelimit() behaves as expected. (BZ#1169401)

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.

See also :

https://www.redhat.com/security/data/cve/CVE-2014-3673.html
https://www.redhat.com/security/data/cve/CVE-2014-3687.html
https://www.redhat.com/security/data/cve/CVE-2014-3688.html
http://rhn.redhat.com/errata/RHSA-2015-0043.html

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.8
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C)
CVSS Temporal Score : 5.8
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 80507 ()

Bugtraq ID: 70766
70768
70883

CVE ID: CVE-2014-3673
CVE-2014-3687
CVE-2014-3688

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