Scientific Linux Security Update : kernel on SL6.x i386/x86_64

This script is Copyright (C) 2017 Tenable Network Security, Inc.


Synopsis :

The remote Scientific Linux host is missing one or more security
updates.

Description :

Security Fix(es) :

- When creating audit records for parameters to executed
children processes, an attacker can convince the Linux
kernel audit subsystem can create corrupt records which
may allow an attacker to misrepresent or evade logging
of executing commands. (CVE-2016-6136, Moderate)

- A flaw was found in the Linux kernel's implementation of
the SCTP protocol. A remote attacker could trigger an
out-of-bounds read with an offset of up to 64kB
potentially causing the system to crash. (CVE-2016-9555,
Moderate)

Bug Fix(es) :

- The qlnic driver previously attempted to fetch pending
transmission descriptors before all writes were
complete, which lead to firmware hangs. With this
update, the qlcnic driver has been fixed to complete all
writes before the hardware fetches any pending
transmission descriptors. As a result, the firmware no
longer hangs with the qlcnic driver.

- Previously, when a NFS share was mounted, the
file-system (FS) cache was incorrectly enabled even when
the '-o fsc' option was not used in the mount command.
Consequently, the cachefilesd service stored files in
the NFS share even when not instructed to by the user.
With this update, NFS does not use the FS cache if not
instructed by the '-o fsc' option. As a result, NFS no
longer enables caching if the '-o fsc' option is not
used.

- Previously, an NFS client and NFS server got into a NFS4
protocol loop involving a WRITE action and a
NFS4ERR_EXPIRED response when the current_fileid counter
got to the wraparound point by overflowing the value of
32 bits. This update fixes the NFS server to handle the
current_fileid wraparound. As a result, the described
NFS4 protocol loop no longer occurs.

- Previously, certain configurations of the Hewlett
Packard Smart Array (HPSA) devices caused hardware to be
set offline incorrectly when the HPSA driver was
expected to wait for existing I/O operations to
complete. Consequently, a kernel panic occurred. This
update prevents the described problem. As a result, the
kernel panic no longer occurs.

- Previously, memory corruption by copying data into the
wrong memory locations sometimes occurred, because the
__copy_tofrom_user() function was returning incorrect
values. This update fixes the __copy_tofrom_user()
function so that it no longer returns larger values than
the number of bytes it was asked to copy. As a result,
memory corruption no longer occurs in he described
scenario.

- Previously, guest virtual machines (VMs) on a Hyper-V
server cluster got in some cases rebooted during the
graceful node failover test, because the host kept
sending heartbeat packets independently of guests
responding to them. This update fixes the bug by
properly responding to all the heartbeat messages in the
queue, even if they are pending. As a result, guest VMs
no longer get rebooted under the described
circumstances.

- When the 'punching hole' feature of the fallocate
utility was used on an ext4 file system inode with
extent depth of 1, the extent tree of the inode
sometimes became corrupted. With this update, the
underlying source code has been fixed, and extent tree
corruption no longer occurs in the described situation.

See also :

http://www.nessus.org/u?00cce47f

Solution :

Update the affected packages.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)

Family: Scientific Linux Local Security Checks

Nessus Plugin ID: 97378 ()

Bugtraq ID:

CVE ID: CVE-2016-6136
CVE-2016-9555

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