RHEL 6 : kernel (RHSA-2015:1030)

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 one security issue and three bugs are
now available for Red Hat Enterprise Linux 6.4 Advanced Update
Support.

Red Hat Product Security has rated this update as having Important
security impact. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available from the
CVE link in the References section.

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

* A use-after-free flaw was found in the way the Linux kernel's SCTP
implementation handled authentication key reference counting during
INIT collisions. A remote attacker could use this flaw to crash the
system or, potentially, escalate their privileges on the system.
(CVE-2015-1421, Important)

This issue was discovered by Sun Baoliang of Red Hat.

This update also fixes the following bugs :

* When ARP is disabled on an interface with an ARP entry for a
neighbor host present in the ARP cache, letting the cached entry
expire and attempting to communicate with that neighbor host could
cause the host MAC address to not be resolved correctly after ARP is
enabled again on the interface. With the following workaround, the
entry is not expired and the described scenario works correctly :

1) Add the maximum number of ARP entries you expect for your
configuration to the proc/sys/net/ipv4/neigh/default/gc_thresh file.

2) Ensure that relevant IP addresses are put in the ARP cache when the
system boots, for example by executing the following two commands :

ping [IP address] -c 1 ifconfig ethX -arp

(BZ#1207350)

* Previously, the open() system call in some cases failed with an
EBUSY error if the opened file was also being renamed at the same
time. With this update, the kernel automatically retries open() when
this failure occurs, and if the retry is not successful either, open()
now fails with an ESTALE error. (BZ#1207813)

* Previously, a race condition occurred in the build_id_cache__add_s()
function, which could truncate system files. A patch has been provided
to fix this bug, and system files are no longer truncated in the
aforementioned scenario. (BZ#1210591)

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-2015-1421.html
http://rhn.redhat.com/errata/RHSA-2015-1030.html

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)
CVSS Temporal Score : 7.4
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 83843 ()

Bugtraq ID: 72356

CVE ID: CVE-2015-1421

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