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Red Hat Security Advisory

Synopsis:          Moderate: libgcrypt security and bug fix update
Advisory ID:       RHSA-2021:4409-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:4409
Issue date:        2021-11-09
CVE Names:         CVE-2021-33560
====================================================================
1. Summary:

An update for libgcrypt is now available for Red Hat Enterprise Linux 8.

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

2. Relevant releases/architectures:

Red Hat Enterprise Linux BaseOS (v. 8) - aarch64, ppc64le, s390x, x86_64

3. Description:

The libgcrypt library provides general-purpose implementations of various
cryptographic algorithms.

Security Fix(es):

* libgcrypt: mishandles ElGamal encryption because it lacks exponent
blinding to address a side-channel attack against mpi_powm (CVE-2021-33560)

For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 8.5 Release Notes linked from the References section.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1970096 - CVE-2021-33560 libgcrypt: mishandles ElGamal encryption because it lacks exponent blinding to address a side-channel attack against mpi_powm
1976137 - Enable hardware optimizations in FIPS mode

6. Package List:

Red Hat Enterprise Linux BaseOS (v. 8):

Source:
libgcrypt-1.8.5-6.el8.src.rpm

aarch64:
libgcrypt-1.8.5-6.el8.aarch64.rpm
libgcrypt-debuginfo-1.8.5-6.el8.aarch64.rpm
libgcrypt-debugsource-1.8.5-6.el8.aarch64.rpm
libgcrypt-devel-1.8.5-6.el8.aarch64.rpm
libgcrypt-devel-debuginfo-1.8.5-6.el8.aarch64.rpm

ppc64le:
libgcrypt-1.8.5-6.el8.ppc64le.rpm
libgcrypt-debuginfo-1.8.5-6.el8.ppc64le.rpm
libgcrypt-debugsource-1.8.5-6.el8.ppc64le.rpm
libgcrypt-devel-1.8.5-6.el8.ppc64le.rpm
libgcrypt-devel-debuginfo-1.8.5-6.el8.ppc64le.rpm

s390x:
libgcrypt-1.8.5-6.el8.s390x.rpm
libgcrypt-debuginfo-1.8.5-6.el8.s390x.rpm
libgcrypt-debugsource-1.8.5-6.el8.s390x.rpm
libgcrypt-devel-1.8.5-6.el8.s390x.rpm
libgcrypt-devel-debuginfo-1.8.5-6.el8.s390x.rpm

x86_64:
libgcrypt-1.8.5-6.el8.i686.rpm
libgcrypt-1.8.5-6.el8.x86_64.rpm
libgcrypt-debuginfo-1.8.5-6.el8.i686.rpm
libgcrypt-debuginfo-1.8.5-6.el8.x86_64.rpm
libgcrypt-debugsource-1.8.5-6.el8.i686.rpm
libgcrypt-debugsource-1.8.5-6.el8.x86_64.rpm
libgcrypt-devel-1.8.5-6.el8.i686.rpm
libgcrypt-devel-1.8.5-6.el8.x86_64.rpm
libgcrypt-devel-debuginfo-1.8.5-6.el8.i686.rpm
libgcrypt-devel-debuginfo-1.8.5-6.el8.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2021-33560
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.5_release_notes/

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2021 Red Hat, Inc.
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