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Ubuntu 18.04 LTS: USN-7340-1 moderate: OpenVPN denial of service

ubuntu
Calendar Grey March 11, 2025
Dist Ubuntu Esm H88
Important patches released for OpenVPN flaws impacting Ubuntu distributions. Addresses denial of service threats and additional concerns.
Several security issues were fixed in OpenVPN.

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)

Topics%20covered

Topics Covered

security advisory denial of service buffer overflow Ubuntu input validation OpenVPN

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

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7340-1

Topics%20covered

Topics Covered

security advisory denial of service buffer overflow Ubuntu input validation OpenVPN

Package Information

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