USN-4933-1: OpenVPN vulnerabilities

Releases

• Ubuntu 21.04
• Ubuntu 20.10
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM

Packages

• openvpn - virtual private network software

Details

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

• openvpn - 2.4.7-1ubuntu2.20.04.2

Ubuntu 18.04

• openvpn - 2.4.4-2ubuntu1.5

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

References

• CVE-2020-15078
• CVE-2020-11810