[USN-5347-1] OpenVPN vulnerability

[Marc Deslauriers]

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Ubuntu Security Notice USN-5347-1
March 24, 2022

openvpn vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

OpenVPN could allow unintended access to network services.

Software Description:
- openvpn: virtual private network software

Details:

It was discovered that OpenVPN incorrectly handled certain configurations
with multiple authentication plugins. A remote attacker could possibly use
this issue to bypass authentication using incomplete credentials.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 21.10:
  openvpn                         2.5.1-3ubuntu1.1

Ubuntu 20.04 LTS:
  openvpn                         2.4.7-1ubuntu2.20.04.4

Ubuntu 18.04 LTS:
  openvpn                         2.4.4-2ubuntu1.7

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-5347-1
  CVE-2022-0547

Package Information:
  https://launchpad.net/ubuntu/+source/openvpn/2.5.1-3ubuntu1.1
  https://launchpad.net/ubuntu/+source/openvpn/2.4.7-1ubuntu2.20.04.4
  https://launchpad.net/ubuntu/+source/openvpn/2.4.4-2ubuntu1.7
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