RHEL 6 : kernel (RHSA-2014:0771)

This script is Copyright (C) 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 and several
bugs are now available for Red Hat Enterprise Linux 6.

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

* A flaw was found in the way the Linux kernel's futex subsystem
handled the requeuing of certain Priority Inheritance (PI) futexes. A
local, unprivileged user could use this flaw to escalate their
privileges on the system. (CVE-2014-3153, Important)

* A flaw was found in the way the Linux kernel's floppy driver handled
user space provided data in certain error code paths while processing
FDRAWCMD IOCTL commands. A local user with write access to /dev/fdX
could use this flaw to free (using the kfree() function) arbitrary
kernel memory. (CVE-2014-1737, Important)

* It was found that the Linux kernel's floppy driver leaked internal
kernel memory addresses to user space during the processing of the
FDRAWCMD IOCTL command. A local user with write access to /dev/fdX
could use this flaw to obtain information about the kernel heap
arrangement. (CVE-2014-1738, Low)

Note: A local user with write access to /dev/fdX could use these two
flaws (CVE-2014-1737 in combination with CVE-2014-1738) to escalate
their privileges on the system.

* It was discovered that the proc_ns_follow_link() function did not
properly return the LAST_BIND value in the last pathname component as
is expected for procfs symbolic links, which could lead to excessive
freeing of memory and consequent slab corruption. A local,
unprivileged user could use this flaw to crash the system.
(CVE-2014-0203, Moderate)

* A flaw was found in the way the Linux kernel handled exceptions when
user-space applications attempted to use the linkage stack. On IBM
S/390 systems, a local, unprivileged user could use this flaw to crash
the system. (CVE-2014-2039, Moderate)

* An invalid pointer dereference flaw was found in the Marvell 8xxx
Libertas WLAN (libertas) driver in the Linux kernel. A local user able
to write to a file that is provided by the libertas driver and located
on the debug file system (debugfs) could use this flaw to crash the
system. Note: The debugfs file system must be mounted locally to
exploit this issue. It is not mounted by default. (CVE-2013-6378, 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)

Red Hat would like to thank Kees Cook of Google for reporting
CVE-2014-3153, Matthew Daley for reporting CVE-2014-1737 and
CVE-2014-1738, and Vladimir Davydov of Parallels for reporting
CVE-2014-0203. Google acknowledges Pinkie Pie as the original reporter
of CVE-2014-3153.

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

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-2013-6378.html
https://www.redhat.com/security/data/cve/CVE-2014-0203.html
https://www.redhat.com/security/data/cve/CVE-2014-1737.html
https://www.redhat.com/security/data/cve/CVE-2014-1738.html
https://www.redhat.com/security/data/cve/CVE-2014-1874.html
https://www.redhat.com/security/data/cve/CVE-2014-2039.html
https://www.redhat.com/security/data/cve/CVE-2014-3153.html
http://www.nessus.org/u?64c6b598
http://rhn.redhat.com/errata/RHSA-2014-0771.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 : 6.3
(CVSS2#E:ND/RL:OF/RC:C)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 76156 ()

Bugtraq ID: 63886
65459
65700
67300
67302
68125

CVE ID: CVE-2013-6378
CVE-2014-0203
CVE-2014-1737
CVE-2014-1738
CVE-2014-1874
CVE-2014-2039
CVE-2014-3153