[El-errata] New openssl updates available via Ksplice (ELSA-2021-3798)

[Errata Announcements for Oracle Linux]

Synopsis: ELSA-2021-3798 can now be patched using Ksplice
CVEs: CVE-2021-23480 CVE-2021-23841

Users with Oracle Linux Premier Support can now use Ksplice to patch
against the latest Oracle Linux Security Advisory, ELSA-2021-3798.

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
openssl RPMs and statically linked applications using
openssl 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

* CVE-2021-23480: Integer overflow in EVP functions.

An arithmetic error in certain EVP functions can cause applications
to crash, or behave unexpectedly.  A remote attacker could potentially
exploit this flaw to crash a server or client application, or to aid
in another type of attack.


* CVE-2021-23841: Denial-of-service when generating hashes from x509 certificate.

Improper error handling when trying to generate a unique hash from the
issuer and serial number of an x509 certificate can result in a NULL
pointer dereference, and subsequent application crash.  A remote
attacker could exploit this flaw to cause a denial-of-service.

SUPPORT

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