RHEL 6 : kernel-rt (RHSA-2016:1883)

This script is Copyright (C) 2016-2017 Tenable Network Security, Inc.


Synopsis :

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

Description :

An update for kernel-rt is now available for Red Hat Enterprise MRG
2.5.

Red Hat Product Security has rated this update as having a security
impact of Important. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link(s) in the References section.

The kernel-rt packages provide the Real Time Linux Kernel, which
enables fine-tuning for systems with extremely high determinism
requirements.

The kernel-rt packages have been upgraded to version
3.10.0-327.rt56.197, which provides a number of bug fixes over the
previous version. (BZ#1366059)

Security Fix(es) :

* A security flaw was found in the Linux kernel in the
mark_source_chains() function in 'net/ipv4/netfilter/ip_tables.c'. It
is possible for a user-supplied 'ipt_entry' structure to have a large
'next_offset' field. This field is not bounds checked prior to writing
to a counter value at the supplied offset. (CVE-2016-3134, Important)

* A flaw was discovered in processing setsockopt for 32 bit processes
on 64 bit systems. This flaw will allow attackers to alter arbitrary
kernel memory when unloading a kernel module. This action is usually
restricted to root-privileged users but can also be leveraged if the
kernel is compiled with CONFIG_USER_NS and CONFIG_NET_NS and the user
is granted elevated privileges. (CVE-2016-4997, Important)

* An out-of-bounds heap memory access leading to a Denial of Service,
heap disclosure, or further impact was found in setsockopt(). The
function call is normally restricted to root, however some processes
with cap_sys_admin may also be able to trigger this flaw in privileged
container environments. (CVE-2016-4998, Moderate)

See also :

https://www.redhat.com/security/data/cve/CVE-2016-3134.html
https://www.redhat.com/security/data/cve/CVE-2016-4997.html
https://www.redhat.com/security/data/cve/CVE-2016-4998.html
http://rhn.redhat.com/errata/RHSA-2016-1883.html

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.2
(CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 6.5
(CVSS2#E:POC/RL:U/RC:ND)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 93504 ()

Bugtraq ID:

CVE ID: CVE-2016-3134
CVE-2016-4997
CVE-2016-4998

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