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Red Hat 8.1 RHSA-2021:0620-01 Important: Stunnel Client Cert Fix

red hat
Calendar Grey February 22, 2021
Dist Redhat Esm H88
The latest Stunnel upgrade for Red Hat Linux 8.1 enhances security through client certificate validation and encrypted networking. Maintain your defense!
An update for stunnel is now available for Red Hat Enterprise Linux 8.1 Extended Update Support

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

Summary

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.

Topics%20covered

Topics Covered

security advisory Red Hat security fix Red Hat Enterprise security impact stunnel important update network encryption Important security client certificate stunnel update

References

https://access.redhat.com/security/cve/CVE-2021-20230 https://access.redhat.com/security/updates/classification/#important

Package List

Red Hat Enterprise Linux BaseOS EUS (v. 8.1):
Source: stunnel-5.48-6.el8_1.src.rpm
aarch64: stunnel-5.48-6.el8_1.aarch64.rpm stunnel-debuginfo-5.48-6.el8_1.aarch64.rpm stunnel-debugsource-5.48-6.el8_1.aarch64.rpm
ppc64le: stunnel-5.48-6.el8_1.ppc64le.rpm stunnel-debuginfo-5.48-6.el8_1.ppc64le.rpm stunnel-debugsource-5.48-6.el8_1.ppc64le.rpm
s390x: stunnel-5.48-6.el8_1.s390x.rpm stunnel-debuginfo-5.48-6.el8_1.s390x.rpm stunnel-debugsource-5.48-6.el8_1.s390x.rpm
x86_64: stunnel-5.48-6.el8_1.x86_64.rpm stunnel-debuginfo-5.48-6.el8_1.x86_64.rpm stunnel-debugsource-5.48-6.el8_1.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/


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:0620-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:0620
Issue date: 2021-02-22

Topic

An update for stunnel is now available for Red Hat Enterprise Linux 8.1Extended Update Support.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory Red Hat security fix Red Hat Enterprise security impact stunnel important update network encryption Important security client certificate stunnel update

Relevant Releases Architectures

Red Hat Enterprise Linux BaseOS EUS (v. 8.1) - aarch64, ppc64le, s390x, x86_64

Bugs Fixed

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

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