RHEL 6 : kernel (RHSA-2011:1530)

This script is Copyright (C) 2011-2014 Tenable Network Security, Inc.


Synopsis :

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

Description :

Updated kernel packages that fix multiple security issues, address
several hundred bugs and add numerous enhancements are now available
as part of the ongoing support and maintenance of Red Hat Enterprise
Linux version 6. This is the second regular update.

The Red Hat Security Response Team has rated this update as having
moderate 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.

This update fixes the following security issues :

* The proc file system could allow a local, unprivileged user to
obtain sensitive information or possibly cause integrity issues.
(CVE-2011-1020, Moderate)

* Non-member VLAN (virtual LAN) packet handling for interfaces in
promiscuous mode and also using the be2net driver could allow an
attacker on the local network to cause a denial of service.
(CVE-2011-3347, Moderate)

* A flaw was found in the Linux kernel in the way splitting two
extents in ext4_ext_convert_to_initialized() worked. A local,
unprivileged user with access to mount and unmount ext4 file systems
could use this flaw to cause a denial of service. (CVE-2011-3638,
Moderate)

* A NULL pointer dereference flaw was found in the way the Linux
kernel's key management facility handled user-defined key types. A
local, unprivileged user could use the keyctl utility to cause a
denial of service. (CVE-2011-4110, Moderate)

Red Hat would like to thank Kees Cook for reporting CVE-2011-1020

Somnath Kotur for reporting CVE-2011-3347
and Zheng Liu for reporting
CVE-2011-3638.

This update also fixes several hundred bugs and adds enhancements.
Refer to the Red Hat Enterprise Linux 6.2 Release Notes for
information on the most significant of these changes, and the
Technical Notes for further information, both linked to in the
References.

All Red Hat Enterprise Linux 6 users are advised to install these
updated packages, which correct these issues, and fix the bugs and add
the enhancements noted in the Red Hat Enterprise Linux 6.2 Release
Notes and Technical Notes. The system must be rebooted for this update
to take effect.

See also :

https://www.redhat.com/security/data/cve/CVE-2011-1020.html
https://www.redhat.com/security/data/cve/CVE-2011-3347.html
https://www.redhat.com/security/data/cve/CVE-2011-3638.html
https://www.redhat.com/security/data/cve/CVE-2011-4110.html
http://www.nessus.org/u?648c0194
https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/
http://rhn.redhat.com/errata/RHSA-2011-1530.html

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 4.6
(CVSS2#AV:A/AC:H/Au:N/C:N/I:N/A:C)
CVSS Temporal Score : 3.8
(CVSS2#E:F/RL:OF/RC:C)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 57012 ()

Bugtraq ID: 46567
50312
50755

CVE ID: CVE-2011-1020
CVE-2011-3347
CVE-2011-3638
CVE-2011-4110