RHEL 6 : kernel (RHSA-2015:0695)

This script is Copyright (C) 2015-2017 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 two bugs
are now available for Red Hat Enterprise Linux 6.2 Advanced Update
Support.

Red Hat Product Security 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 SCTP implementation
validated INIT chunks when performing Address Configuration Change
(ASCONF). A remote attacker could use this flaw to crash the system by
sending a specially crafted SCTP packet to trigger a NULL pointer
dereference on the system. (CVE-2014-7841, Important)

* It was found that the Linux kernel's Infiniband subsystem did not
properly sanitize input parameters while registering memory regions
from user space via the (u)verbs API. A local user with access to a
/dev/infiniband/uverbsX device could use this flaw to crash the system
or, potentially, escalate their privileges on the system.
(CVE-2014-8159, Important)

* An integer overflow flaw was found in the way the Linux kernel's
Frame Buffer device implementation mapped kernel memory to user space
via the mmap syscall. A local user able to access a frame buffer
device file (/dev/fb*) could possibly use this flaw to escalate their
privileges on the system. (CVE-2013-2596, Important)

* It was found that the parse_rock_ridge_inode_internal() function of
the Linux kernel's ISOFS implementation did not correctly check
relocated directories when processing Rock Ridge child link (CL) tags.
An attacker with physical access to the system could use a specially
crafted ISO image to crash the system or, potentially, escalate their
privileges on the system. (CVE-2014-5471, CVE-2014-5472, Low)

Red Hat would like to thank Mellanox for reporting the CVE-2014-8159
issue. The CVE-2014-7841 issue was discovered by Liu Wei of Red Hat.

This update also fixes the following bugs :

* Previously, certain network device drivers did not accept ethtool
commands right after they were loaded. As a consequence, the current
setting of the specified device driver was not applied and an error
message was returned. The ETHTOOL_DELAY variable has been added, which
makes sure the ethtool utility waits for some time before it tries to
apply the options settings, thus fixing the bug. (BZ#1138299)

* During the memory allocation for a new socket to communicate to the
server, the rpciod daemon released a clean page which needed to be
committed. However, the commit was queueing indefinitely as the commit
could only be provided with a socket connection. As a consequence, a
deadlock occurred in rpciod. This update sets the PF_FSTRANS flag on
the work queue task prior to the socket allocation, and adds the
nfs_release_page check for the flag when deciding whether to make a
commit call, thus fixing this bug. (BZ#1192326)

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-2013-2596.html
https://www.redhat.com/security/data/cve/CVE-2014-5471.html
https://www.redhat.com/security/data/cve/CVE-2014-5472.html
https://www.redhat.com/security/data/cve/CVE-2014-7841.html
https://www.redhat.com/security/data/cve/CVE-2014-8159.html
http://rhn.redhat.com/errata/RHSA-2015-0695.html

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 6.9
(CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 5.1
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 81906 ()

Bugtraq ID:

CVE ID: CVE-2013-2596
CVE-2014-5471
CVE-2014-5472
CVE-2014-7841
CVE-2014-8159

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