RHEL 6 : MRG (RHSA-2013:0566)

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 several security issues and
multiple bugs are now available for Red Hat Enterprise MRG 2.3.

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.

This update fixes the following security issues :

* A buffer overflow flaw was found in the way UTF-8 characters were
converted to UTF-16 in the utf8s_to_utf16s() function of the Linux
kernel's FAT file system implementation. A local user able to mount a
FAT file system with the 'utf8=1' option could use this flaw to crash
the system or, potentially, to escalate their privileges.
(CVE-2013-1773, Important)

* It was found that the RHSA-2012:0333 update did not correctly fix
the CVE-2011-4131 issue. A malicious Network File System version 4
(NFSv4) server could return a crafted reply to a GETACL request,
causing a denial of service on the client. (CVE-2012-2375, Moderate)

* A memory disclosure flaw was found in the way the load_script()
function in the binfmt_script binary format handler handled excessive
recursions. A local, unprivileged user could use this flaw to leak
kernel stack memory to user-space by executing specially crafted
scripts. (CVE-2012-4530, Low)

* A flaw was found in the way file permission checks for the
'/dev/kmsg' file were performed in restricted root environments (for
example, when using a capability-based security model). A local user
able to write to this file could cause a denial of service.
(CVE-2013-1772, Low)

The CVE-2012-2375 issue was discovered by Jian Li of Red Hat.

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

Users should upgrade to these updated packages, which upgrade the
kernel-rt kernel to version kernel-rt-3.6.11-rt28, correct these
issues, and fix the bugs 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-2012-2375.html
https://www.redhat.com/security/data/cve/CVE-2012-4530.html
https://www.redhat.com/security/data/cve/CVE-2013-1772.html
https://www.redhat.com/security/data/cve/CVE-2013-1773.html
https://rhn.redhat.com/errata/RHSA-2012-0333.html
http://www.nessus.org/u?385bfeb4
http://rhn.redhat.com/errata/RHSA-2013-0566.html
http://www.nessus.org/u?b2da6e03

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 6.2
(CVSS2#AV:L/AC:H/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 4.9
(CVSS2#E:POC/RL:OF/RC:C)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 76658 ()

Bugtraq ID: 53615
55878
58118
58200

CVE ID: CVE-2011-4131
CVE-2012-2375
CVE-2012-4530
CVE-2013-1772
CVE-2013-1773

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