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Ubuntu Security Notice USN-4933-1
May 04, 2021
openvpn vulnerabilities
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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
Summary:
everal security issues were fixed in OpenVPN.
Software Description:
- 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 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.
References:
https://ubuntu.com/security/notices/USN-4933-1
CVE-2020-11810, CVE-2020-15078
Package Information:
https://launchpad.net/ubuntu/+source/openvpn/2.5.1-1ubuntu1.1
https://launchpad.net/ubuntu/+source/openvpn/2.4.9-3ubuntu1.1
https://launchpad.net/ubuntu/+source/openvpn/2.4.7-1ubuntu2.20.04.2
https://launchpad.net/ubuntu/+source/openvpn/2.4.4-2ubuntu1.5
