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Ubuntu Security Notice USN-6860-1
July 02, 2024

openvpn vulnerabilities

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

• Ubuntu 24.04 LTS
• Ubuntu 23.10
• Ubuntu 22.04 LTS
• Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in OpenVPN.

Software Description:

• openvpn: virtual private network software

Details:

Reynir Björnsson discovered that OpenVPN incorrectly handled terminating
client connections. A remote authenticated client could possibly use this
issue to keep the connection active, bypassing certain security policies.
This issue only affected Ubuntu 23.10, and Ubuntu 24.04 LTS.
(CVE-2024-28882)

Reynir Björnsson discovered that OpenVPN incorrectly handled certain
control channel messages with nonprintable characters. A remote attacker
could possibly use this issue to cause OpenVPN to consume resources, or
fill up log files with garbage, leading to a denial of service.
(CVE-2024-5594)

Update instructions:

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

Ubuntu 24.04 LTS
openvpn 2.6.9-1ubuntu4.1

Ubuntu 23.10
openvpn 2.6.5-0ubuntu1.2

Ubuntu 22.04 LTS
openvpn 2.5.9-0ubuntu0.22.04.3

Ubuntu 20.04 LTS
openvpn 2.4.12-0ubuntu0.20.04.2

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

References:
https://ubuntu.com/security/notices/USN-6860-1
CVE-2024-28882, CVE-2024-5594

Package Information:
https://launchpad.net/ubuntu/+source/openvpn/2.6.9-1ubuntu4.1
https://launchpad.net/ubuntu/+source/openvpn/2.6.5-0ubuntu1.2
https://launchpad.net/ubuntu/+source/openvpn/2.5.9-0ubuntu0.22.04.3
https://launchpad.net/ubuntu/+source/openvpn/2.4.12-0ubuntu0.20.04.2