CVE-2020-15078: Authentication bypass with deferred authentication

Overview

OpenVPN 2.5.1 and earlier versions allows a remote attackers to bypass
authentication and access control channel data on servers configured
with deferred authentication, which can be used to potentially trigger
further information leaks.

Detailed description

This bug allows - under very specific circumstances - to trick a server
using delayed authentication (plugin or management) into returning a
PUSH_REPLY before the AUTH_FAILED message, which can possibly be used
to gather information about a VPN setup.

In combination with "--auth-gen-token" or a user-specific token auth
solution it can be possible to get access to a VPN with an
otherwise-invalid account.

Pre-Dependency:
CVE-2020-15078-0.patch: https://github.com/OpenVPN/openvpn/commit/14511010

CVE-Fix:
CVE-2020-15078-1.patch: https://github.com/OpenVPN/openvpn/commit/3aca477a
CVE-2020-15078-2.patch: https://github.com/OpenVPN/openvpn/commit/3d18e308
CVE-2020-15078-3.patch: https://github.com/OpenVPN/openvpn/commit/f7b3bf06

Closes: #987380

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