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Ubuntu Security Notice USN-7340-1
March 11, 2025

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in OpenVPN.

Software Description:
- openvpn: virtual private network software

Details:

It was discovered that OpenVPN did not perform proper input validation
when generating a TLS key under certain configuration, which could lead to
a buffer overflow. An attacker could possibly use this issue to cause a
denial of service or execute arbitrary code. This issue only affected
Ubuntu 14.04 LTS, Ubuntu 16.04 LTS. (CVE-2017-12166)

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 18.04 LTS
  openvpn                         2.4.4-2ubuntu1.7+esm1
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  openvpn                         2.3.10-1ubuntu2.2+esm2
                                  Available with Ubuntu Pro

Ubuntu 14.04 LTS
  openvpn                         2.3.2-7ubuntu3.2+esm2
                                  Available with Ubuntu Pro

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

References:
  https://ubuntu.com/security/notices/USN-7340-1
  CVE-2017-12166, CVE-2024-5594