[El-errata] New glibc updates available via Ksplice (ELSA-2021-0348)

[Errata Announcements for Oracle Linux]

Synopsis: ELSA-2021-0348 can now be patched using Ksplice
CVEs: CVE-2019-25013 CVE-2020-10029 CVE-2020-29573

Users with Oracle Linux Premier Support can now use Ksplice to patch
against the latest Oracle Linux Security Advisory, ELSA-2021-0348.

INSTALLING THE UPDATES

We recommend that all users of Ksplice on OL 7 install these updates.

You can install these updates by running:

# ksplice -y user upgrade

32-bit applications should be restarted after upgrading the on-disk
glibc RPMs and statically linked applications using
glibc should be rebuilt to include these fixes.

Ksplice user-space patching requires installation of Ksplice-aware
packages and the system must be rebooted after the first installation of
these packages.  Refer to the installation instructions for the Enhanced
Ksplice Client in the Ksplice User's Guide for more details.  Systems
may be prepared for Ksplice patching by installing the Ksplice aware
packages in advance, prior to installing the enhanced Ksplice client.

DESCRIPTION

* Note: Oracle will not provide a zero-downtime update for CVE-2019-25013.

Oracle has determined that patching CVE-2019-25013 on a running system
would not be safe and recommends to restart affected processes. The
vulnerability could lead to privileges escalation if an application is
using EUC-KR encoding when converting characters.


* CVE-2020-29573: Buffer overflow when using printf functions.

A logic error when passing 80-bit long double with a non-canonical bit
pattern to the printf function could lead to a buffer overflow. A local
attacker could use this flaw to escalate privileges.


* CVE-2020-10029: On-stack buffer overflow when passing specific value to sinl() function.

A missing check when passing specific input to sinl() function could
lead to a stack buffer overflow. A local attacker could use this flaw to
escalate privileges.

SUPPORT

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