Ubuntu 24.04 LTS USN-6860-1 Critical Security Advisory: OpenVPN DoS

ubuntu

July 2, 2024

Several security issues were fixed in OpenVPN.

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)

Topics Covered

security advisory security issue DoS OpenVPN resource consumption client connection Ubuntu 24.04

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.