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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Critical: nss security update
Advisory ID:       RHSA-2021:4994-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:4994
Issue date:        2021-12-07
CVE Names:         CVE-2021-43527 
=====================================================================

1. Summary:

An update for nss is now available for Red Hat Enterprise Linux 7.3
Advanced Update Support.

Red Hat Product Security has rated this update as having a security impact
of Critical. 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 Server AUS (v. 7.3) - x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 7.3) - x86_64

3. Description:

Network Security Services (NSS) is a set of libraries designed to support
the cross-platform development of security-enabled client and server
applications.

Security Fix(es):

* nss: Memory corruption in decodeECorDsaSignature with DSA signatures (and
RSA-PSS) (CVE-2021-43527)

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.

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

After installing this update, applications using NSS (for example, Firefox)
must be restarted for this update to take effect.

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

2024370 - CVE-2021-43527 nss: Memory corruption in decodeECorDsaSignature with
 DSA signatures (and RSA-PSS)

6. Package List:

Red Hat Enterprise Linux Server AUS (v. 7.3):

Source:
nss-3.28.4-2.el7_3.src.rpm

x86_64:
nss-3.28.4-2.el7_3.i686.rpm
nss-3.28.4-2.el7_3.x86_64.rpm
nss-debuginfo-3.28.4-2.el7_3.i686.rpm
nss-debuginfo-3.28.4-2.el7_3.x86_64.rpm
nss-devel-3.28.4-2.el7_3.i686.rpm
nss-devel-3.28.4-2.el7_3.x86_64.rpm
nss-sysinit-3.28.4-2.el7_3.x86_64.rpm
nss-tools-3.28.4-2.el7_3.x86_64.rpm

Red Hat Enterprise Linux Server Optional AUS (v. 7.3):

x86_64:
nss-debuginfo-3.28.4-2.el7_3.i686.rpm
nss-debuginfo-3.28.4-2.el7_3.x86_64.rpm
nss-pkcs11-devel-3.28.4-2.el7_3.i686.rpm
nss-pkcs11-devel-3.28.4-2.el7_3.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-2021-43527
https://access.redhat.com/security/updates/classification/#critical
https://access.redhat.com/security/vulnerabilities/RHSB-2021-008

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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