USN-7340-1: OpenVPN vulnerabilities

Publication date

11 March 2025

Overview

Several security issues were fixed in OpenVPN.


Packages

  • 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)

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

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
18.04 bionic openvpn –  2.4.4-2ubuntu1.7+esm1  
16.04 xenial openvpn –  2.3.10-1ubuntu2.2+esm2  
14.04 trusty openvpn –  2.3.2-7ubuntu3.2+esm2  

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