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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/

Gentoo: GLSA-202105-25: OpenVPN: Authentication bypass

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

Summary

It was discovered that OpenVPN incorrectly handled 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.

Severity
Severity: Normal
Title: OpenVPN: Authentication bypass
Issued Date: May 26, 2021
Bugs: #785115
ID: 202105-25

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

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.

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