RHEL 6 : MRG (RHSA-2014:0439)

This script is Copyright (C) 2014-2017 Tenable Network Security, Inc.


Synopsis :

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

Description :

Updated kernel-rt packages that fix multiple security issues, several
bugs, and add various enhancements are now available for Red Hat
Enterprise MRG 2.5.

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.

The kernel-rt packages contain the Linux kernel, the core of any Linux
operating system.

* A denial of service flaw was found in the way the Linux
kernel's IPv6 implementation processed IPv6 router
advertisement (RA) packets. An attacker able to send a
large number of RA packets to a target system could
potentially use this flaw to crash the target system.
(CVE-2014-2309, Important)

* A flaw was found in the way the Linux kernel's netfilter
connection tracking implementation for Datagram
Congestion Control Protocol (DCCP) packets used the
skb_header_pointer() function. A remote attacker could
use this flaw to send a specially crafted DCCP packet
to crash the system or, potentially, escalate their
privileges on the system. (CVE-2014-2523, Important)

* A flaw was found in the way the Linux kernel's CIFS
implementation handled uncached write operations with
specially crafted iovec structures. An unprivileged
local user with access to a CIFS share could use this
flaw to crash the system, leak kernel memory, or,
potentially, escalate their privileges on the system.
(CVE-2014-0069, Moderate)

* A flaw was found in the way the Linux kernel handled
pending Floating Pointer Unit (FPU) exceptions during
the switching of tasks. A local attacker could use this
flaw to terminate arbitrary processes on the system,
causing a denial of service, or, potentially, escalate
their privileges on the system. Note that this flaw only
affected systems using AMD CPUs on both 32-bit and
64-bit architectures. (CVE-2014-1438, Moderate)

* It was found that certain protocol handlers in the Linux
kernel's networking implementation could set the
addr_len value without initializing the associated data
structure. A local, unprivileged user could use this
flaw to leak kernel stack memory to user space using the
recvmsg, recvfrom, and recvmmsg system calls.
(CVE-2013-7263, CVE-2013-7265, Low)

* An information leak flaw was found in the Linux kernel's
netfilter connection tracking IRC NAT helper
implementation that could allow a remote attacker to
disclose portions of kernel stack memory during IRC
DCC (Direct Client-to-Client) communication over NAT.
(CVE-2014-1690, Low)

* A denial of service flaw was discovered in the way the
Linux kernel's SELinux implementation handled files with
an empty SELinux security context. A local user who has
the CAP_MAC_ADMIN capability could use this flaw to
crash the system. (CVE-2014-1874, Low)

This update also fixes several bugs and adds multiple enhancements.
Documentation for these changes will be available shortly from the
Technical Notes document linked to in the References section.

Users are advised to upgrade to these updated packages, which upgrade
the kernel-rt kernel to version kernel-rt-3.10.33-rt32.33, correct
these issues, and fix the bugs and add the enhancements noted in the
Red Hat Enterprise MRG 2 Technical Notes. The system must be rebooted
for this update to take effect.

See also :

https://www.redhat.com/security/data/cve/CVE-2013-4483.html
https://www.redhat.com/security/data/cve/CVE-2013-7263.html
https://www.redhat.com/security/data/cve/CVE-2013-7265.html
https://www.redhat.com/security/data/cve/CVE-2013-7339.html
https://www.redhat.com/security/data/cve/CVE-2014-0069.html
https://www.redhat.com/security/data/cve/CVE-2014-1438.html
https://www.redhat.com/security/data/cve/CVE-2014-1690.html
https://www.redhat.com/security/data/cve/CVE-2014-1874.html
https://www.redhat.com/security/data/cve/CVE-2014-2309.html
https://www.redhat.com/security/data/cve/CVE-2014-2523.html
http://www.nessus.org/u?ae491241
http://rhn.redhat.com/errata/RHSA-2014-0439.html
http://www.nessus.org/u?687515f3

Solution :

Update the affected packages.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 7.8
(CVSS2#E:POC/RL:OF/RC:C)
Public Exploit Available : true

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