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Gentoo Linux Security Advisory                           GLSA 202105-25
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                                            https://security.gentoo.org/
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  Severity: Normal
     Title: OpenVPN: Authentication bypass
      Date: May 26, 2021
      Bugs: #785115
        ID: 202105-25

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Synopsis
=======
A vulnerability has been found in OpenVPN, allowing attackers to bypass
the authentication process.

Background
=========
OpenVPN is a multi-platform, full-featured SSL VPN solution.

Affected packages
================
     -------------------------------------------------------------------
      Package              /     Vulnerable     /            Unaffected
     -------------------------------------------------------------------
   1  net-vpn/openvpn              < 2.5.2                    >= 2.5.2

Description
==========
It was discovered that OpenVPN incorrectly handled deferred
authentication.

Impact
=====
A remote attacker could bypass authentication and access control
channel data and trigger further information leaks.

Workaround
=========
Configure OpenVPN server to not use deferred authentication.

Resolution
=========
All OpenVPN users should upgrade to the latest version:

   # emerge --sync
   # emerge --ask --oneshot --verbose ">=net-vpn/openvpn-2.5.2"

References
=========
[ 1 ] CVE-2020-15078
       https://nvd.nist.gov/vuln/detail/CVE-2020-15078

Availability
===========
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  https://security.gentoo.org/glsa/202105-25

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/