RHEL 6 : MRG (RHSA-2013:0829)

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.

Security fixes :

* It was found that the kernel-rt update RHBA-2012:0044 introduced an
integer conversion issue in the Linux kernel's Performance Events
implementation. This led to a user-supplied index into the
perf_swevent_enabled array not being validated properly, resulting in
out-of-bounds kernel memory access. A local, unprivileged user could
use this flaw to escalate their privileges. (CVE-2013-2094, Important)

A public exploit for CVE-2013-2094 that affects Red Hat Enterprise MRG
2 is available. Refer to Red Hat Knowledge Solution 373743, linked to
in the References, for further information and mitigation instructions
for users who are unable to immediately apply this update.

* An integer overflow flaw, leading to a heap-based buffer overflow,
was found in the way the Intel i915 driver in the Linux kernel handled
the allocation of the buffer used for relocation copies. A local user
with console access could use this flaw to cause a denial of service
or escalate their privileges. (CVE-2013-0913, Important)

* It was found that the Linux kernel used effective user and group IDs
instead of real ones when passing messages with SCM_CREDENTIALS
ancillary data. A local, unprivileged user could leverage this flaw
with a set user ID (setuid) application, allowing them to escalate
their privileges. (CVE-2013-1979, Important)

* A race condition in install_user_keyrings(), leading to a NULL
pointer dereference, was found in the key management facility. A
local, unprivileged user could use this flaw to cause a denial of
service. (CVE-2013-1792, Moderate)

* A NULL pointer dereference flaw was found in the Linux kernel's XFS
file system implementation. A local user who is able to mount an XFS
file system could use this flaw to cause a denial of service.
(CVE-2013-1819, Moderate)

* An information leak was found in the Linux kernel's POSIX signals
implementation. A local, unprivileged user could use this flaw to
bypass the Address Space Layout Randomization (ASLR) security feature.
(CVE-2013-0914, Low)

* A use-after-free flaw was found in the tmpfs implementation. A local
user able to mount and unmount a tmpfs file system could use this flaw
to cause a denial of service or, potentially, escalate their
privileges. (CVE-2013-1767, Low)

* A NULL pointer dereference flaw was found in the Linux kernel's USB
Inside Out Edgeport Serial Driver implementation. A local user with
physical access to a system and with access to a USB device's tty file
could use this flaw to cause a denial of service. (CVE-2013-1774, Low)

* A format string flaw was found in the ext3_msg() function in the
Linux kernel's ext3 file system implementation. A local user who is
able to mount an ext3 file system could use this flaw to cause a
denial of service or, potentially, escalate their privileges.
(CVE-2013-1848, Low)

* A heap-based buffer overflow flaw was found in the Linux kernel's
cdc-wdm driver, used for USB CDC WCM device management. An attacker
with physical access to a system could use this flaw to cause a denial
of service or, potentially, escalate their privileges. (CVE-2013-1860,
Low)

* A heap-based buffer overflow in the way the tg3 Ethernet driver
parsed the vital product data (VPD) of devices could allow an attacker
with physical access to a system to cause a denial of service or,
potentially, escalate their privileges. (CVE-2013-1929, Low)

* Information leaks in the Linux kernel's cryptographic API could
allow a local user who has the CAP_NET_ADMIN capability to leak kernel
stack memory to user-space. (CVE-2013-2546, CVE-2013-2547,
CVE-2013-2548, Low)

* Information leaks in the Linux kernel could allow a local,
unprivileged user to leak kernel stack memory to user-space.
(CVE-2013-2634, CVE-2013-2635, CVE-2013-3076, CVE-2013-3222,
CVE-2013-3224, CVE-2013-3225, CVE-2013-3231, Low)

Red Hat would like to thank Andy Lutomirski for reporting
CVE-2013-1979. CVE-2013-1792 was discovered by Mateusz Guzik of Red
Hat EMEA GSS SEG Team.

See also :

https://www.redhat.com/security/data/cve/CVE-2013-0913.html
https://www.redhat.com/security/data/cve/CVE-2013-0914.html
https://www.redhat.com/security/data/cve/CVE-2013-1767.html
https://www.redhat.com/security/data/cve/CVE-2013-1774.html
https://www.redhat.com/security/data/cve/CVE-2013-1792.html
https://www.redhat.com/security/data/cve/CVE-2013-1819.html
https://www.redhat.com/security/data/cve/CVE-2013-1848.html
https://www.redhat.com/security/data/cve/CVE-2013-1860.html
https://www.redhat.com/security/data/cve/CVE-2013-1929.html
https://www.redhat.com/security/data/cve/CVE-2013-1979.html
https://www.redhat.com/security/data/cve/CVE-2013-2094.html
https://www.redhat.com/security/data/cve/CVE-2013-2546.html
https://www.redhat.com/security/data/cve/CVE-2013-2547.html
https://www.redhat.com/security/data/cve/CVE-2013-2548.html
https://www.redhat.com/security/data/cve/CVE-2013-2634.html
https://www.redhat.com/security/data/cve/CVE-2013-2635.html
https://www.redhat.com/security/data/cve/CVE-2013-3076.html
https://www.redhat.com/security/data/cve/CVE-2013-3222.html
https://www.redhat.com/security/data/cve/CVE-2013-3224.html
https://www.redhat.com/security/data/cve/CVE-2013-3225.html
https://www.redhat.com/security/data/cve/CVE-2013-3231.html
https://access.redhat.com/site/solutions/373743
https://rhn.redhat.com/errata/RHBA-2012-0044.html
http://www.nessus.org/u?ae491241
http://rhn.redhat.com/errata/RHSA-2013-0829.html
http://www.nessus.org/u?687515f3

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 : 5.6
(CVSS2#E:POC/RL:OF/RC:C)
Public Exploit Available : true