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Gentoo Linux Security Advisory GLSA 202105-02
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https://security.gentoo.org/
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Severity: Low
Title: stunnel: Improper certificate validation
Date: May 26, 2021
Bugs: #772146
ID: 202105-02
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Synopsis
========
Stunnel was not properly verifying TLS certificates, possibly allowing
an integrity/confidentiality compromise.
Background
==========
The stunnel program is designed to work as an SSL/TLS encryption
wrapper between a client and a local or remote server.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-misc/stunnel < 5.58 >= 5.58
Description
===========
It was discovered that stunnel did not correctly verified the client certificate when options "redirect" and "verifyChain" are used.
Impact
======
A remote attacker could send a specially crafted certificate, possibly resulting in a breach of integrity or confidentiality.
Workaround
==========
There is no known workaround at this time.
Resolution
==========
All stunnel users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/stunnel-5.58"
References
==========
[ 1 ] CVE-2021-20230
https://nvd.nist.gov/vuln/detail/CVE-2021-20230
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
https://security.gentoo.org/glsa/202105-02
Concerns?
=========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.
License
=======
Copyright 2021 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).
The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.
https://creativecommons.org/licenses/by-sa/2.5
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