[USN-4933-1] OpenVPN vulnerabilities

Marc Deslauriers marc.deslauriers at canonical.com
Tue May 4 12:18:12 UTC 2021

Ubuntu Security Notice USN-4933-1
May 04, 2021

openvpn vulnerabilities

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

- Ubuntu 21.04
- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS


everal security issues were fixed in OpenVPN.

Software Description:
- openvpn: virtual private network software


It was discovered that OpenVPN incorrectly handled certain data channel v2
packets. A remote attacker could possibly use this issue to inject packets
using a victim's peer-id. This issue only affected Ubuntu 18.04 LTS and
Ubuntu 20.04 LTS. (CVE-2020-11810)

It was discovered that OpenVPN incorrectly handled deferred authentication.
When a server is configured to use deferred authentication, a remote
attacker could possibly use this issue to bypass authentication and access
control channel data. (CVE-2020-15078)

Update instructions:

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

Ubuntu 21.04:
  openvpn                         2.5.1-1ubuntu1.1

Ubuntu 20.10:
  openvpn                         2.4.9-3ubuntu1.1

Ubuntu 20.04 LTS:
  openvpn                         2.4.7-1ubuntu2.20.04.2

Ubuntu 18.04 LTS:
  openvpn                         2.4.4-2ubuntu1.5

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

  CVE-2020-11810, CVE-2020-15078

Package Information:

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