Ubuntu Security Notice 4933-1 – 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. 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. Various other issues were also addressed.

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