[Ksplice][EL6-Updates] New Ksplice updates for OL 6, RHEL 6, CentOS 6, and Scientific Linux 6 (RHSA-2019:2473)

[Oracle Ksplice]

Synopsis: RHSA-2019:2473 can now be patched using Ksplice
CVEs: CVE-2017-17805 CVE-2018-17972 CVE-2019-1125 CVE-2019-5489

Systems running RHCK on Oracle Linux 6, Red Hat Enterprise Linux 6,
CentOS 6, and Scientific Linux 6 can now use Ksplice to patch against
the latest Red Hat Security Advisory, RHSA-2019:2473.

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack running OL 6, RHEL 6,
CentOS 6, and Scientific Linux 6 install these updates.

On systems that have "autoinstall = yes" in /etc/uptrack/uptrack.conf,
these updates will be installed automatically and you do not need to
take any action.

Alternatively, you can install these updates by running:

# /usr/sbin/uptrack-upgrade -y


DESCRIPTION

* CVE-2019-5489: Information leak in the mincore() syscall implementation.

Missing checks in the mincore() syscall could let a local attacker
observes page cache access patterns on other process in the system and
lead to an information leak.


* CVE-2018-17972: Information leak in /proc kernel stack dumps.

A failure to restrict accessing /proc/self/task/*/stack to only
root could allow an unprivileged user to get information about the
stack and its contents on another process.


* CVE-2017-17805: Denial-of-service in SALSA20 block cipher.

Incorrect handling of zero length buffers could result in an invalid
pointer dereference and kernel crash.  A local, unprivileged user could
use this flaw to crash the system, or potentially, escalate privileges.


* CVE-2019-1125: Information leak in kernel entry code when swapping GS.

A local attacker could speculatively access percpu data using a user
defined GS and leak information about running kernel to facilitate an
attack.

SUPPORT

Ksplice support is available at ksplice-support_ww at oracle.com.