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

Synopsis:          Important: stunnel security update
Advisory ID:       RHSA-2021:0618-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:0618
Issue date:        2021-02-22
CVE Names:         CVE-2021-20230 
=====================================================================

1. Summary:

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

Red Hat Product Security has rated this update as having a security impact
of Important. 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:

Stunnel is a wrapper for network connections. It can be used to tunnel an
unencrypted network connection over an encrypted connection (encrypted
using SSL or TLS) or to provide an encrypted means of connecting to
services that do not natively support encryption.

Security Fix(es):

* stunnel: client certificate not correctly verified when redirect and
verifyChain options are used (CVE-2021-20230)

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

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

1925226 - CVE-2021-20230 stunnel: client certificate not correctly verified when redirect and verifyChain options are used

6. Package List:

Red Hat Enterprise Linux BaseOS (v. 8):

Source:
stunnel-5.56-5.el8_3.src.rpm

aarch64:
stunnel-5.56-5.el8_3.aarch64.rpm
stunnel-debuginfo-5.56-5.el8_3.aarch64.rpm
stunnel-debugsource-5.56-5.el8_3.aarch64.rpm

ppc64le:
stunnel-5.56-5.el8_3.ppc64le.rpm
stunnel-debuginfo-5.56-5.el8_3.ppc64le.rpm
stunnel-debugsource-5.56-5.el8_3.ppc64le.rpm

s390x:
stunnel-5.56-5.el8_3.s390x.rpm
stunnel-debuginfo-5.56-5.el8_3.s390x.rpm
stunnel-debugsource-5.56-5.el8_3.s390x.rpm

x86_64:
stunnel-5.56-5.el8_3.x86_64.rpm
stunnel-debuginfo-5.56-5.el8_3.x86_64.rpm
stunnel-debugsource-5.56-5.el8_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-2021-20230
https://access.redhat.com/security/updates/classification/#important

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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