Scientific Linux Security Update : kernel on SL7.x x86_64

This script is Copyright (C) 2016 Tenable Network Security, Inc.


Synopsis :

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

Description :

Security Fix(es) :

- A security flaw was found in the Linux kernel in the
mark_source_chains() function in
'net/ipv4/netfilter/ip_tables.c'. It is possible for a
user-supplied 'ipt_entry' structure to have a large
'next_offset' field. This field is not bounds checked
prior to writing to a counter value at the supplied
offset. (CVE-2016-3134, Important)

- A flaw was discovered in processing setsockopt for 32
bit processes on 64 bit systems. This flaw will allow
attackers to alter arbitrary kernel memory when
unloading a kernel module. This action is usually
restricted to root-privileged users but can also be
leveraged if the kernel is compiled with CONFIG_USER_NS
and CONFIG_NET_NS and the user is granted elevated
privileges. (CVE-2016-4997, Important)

- An out-of-bounds heap memory access leading to a Denial
of Service, heap disclosure, or further impact was found
in setsockopt(). The function call is normally
restricted to root, however some processes with
cap_sys_admin may also be able to trigger this flaw in
privileged container environments. (CVE-2016-4998,
Moderate)

Bug Fix(es) :

- In some cases, running the ipmitool command caused a
kernel panic due to a race condition in the ipmi message
handler. This update fixes the race condition, and the
kernel panic no longer occurs in the described scenario.

- Previously, running I/O-intensive operations in some
cases caused the system to terminate unexpectedly after
a NULL pointer dereference in the kernel. With this
update, a set of patches has been applied to the 3w-9xxx
and 3w-sas drivers that fix this bug. As a result, the
system no longer crashes in the described scenario.

- Previously, the Stream Control Transmission Protocol
(SCTP) sockets did not inherit the SELinux labels
properly. As a consequence, the sockets were labeled
with the unlabeled_t SELinux type which caused SCTP
connections to fail. The underlying source code has been
modified, and SCTP connections now works as expected.

- Previously, the bnx2x driver waited for transmission
completions when recovering from a parity event, which
substantially increased the recovery time. With this
update, bnx2x does not wait for transmission completion
in the described circumstances. As a result, the
recovery of bnx2x after a parity event now takes less
time.

Enhancement(s) :

- With this update, the audit subsystem enables filtering
of processes by name besides filtering by PID. Users can
now audit by executable name (with the '-F
exe=<path-to-executable>' option), which allows
expression of many new audit rules. This functionality
can be used to create events when specific applications
perform a syscall.

- With this update, the Nonvolatile Memory Express (NVMe)
and the multi- queue block layer (blk_mq) have been
upgraded to the Linux 4.5 upstream version. Previously,
a race condition between timeout and freeing request in
blk_mq occurred, which could affect the
blk_mq_tag_to_rq() function and consequently a kernel
oops could occur. The provided patch fixes this race
condition by updating the tags with the active request.
The patch simplifies blk_mq_tag_to_rq() and ensures that
the two requests are not active at the same time.

- The Hyper-V storage driver (storvsc) has been upgraded
from upstream. This update provides moderate performance
improvement of I/O operations when using storvscr for
certain workloads.

See also :

http://www.nessus.org/u?eb6e8478

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)
Public Exploit Available : true

Family: Scientific Linux Local Security Checks

Nessus Plugin ID: 93557 ()

Bugtraq ID:

CVE ID: CVE-2016-3134
CVE-2016-4997
CVE-2016-4998

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