Security Advisory 2021-16

Summary	Octopus Deploy TeamCity Plugin log4j 2.16.0 dependency (CVE-2021-45105)
Advisory Number	2021-16
Discovery Date	19 Dec 2021
Patch Release Date	19 Dec 2021
Advisory Release Date	20 Dec 2021
Product	Octopus Deploy TeamCity Plugin
Operating System	Linux and Windows
Severity	Low
CVE ID	CVE-2021-45105 (Apache Software Foundation)

Severity

Octopus Deploy has given this vulnerability a low rating. This rating was given according to the Octopus Deploy severity levels, which ranks vulnerabilities as critical, high, medium, or low severity.

This is our assessment and you should evaluate its applicability to your own environment.

Details

Another denial of service vulnerability in log4j has been found in version 2.16.0 (CVE-2021-45105) which has been patched in 2.17.0. A new version of the TeamCity plugin has been released to address the vulnerability.

The versions of Octopus Deploy TeamCity Plugin affected by this vulnerability is:

• Version 6.1.8

Fix

To address this vulnerability, we have released Octopus Deploy TeamCity Plugin version:

• 6.1.9 which contains a fix for this issue.

The latest versions of Octopus Deploy products can be downloaded from https://octopus.com/downloads or from the JetBrains plugin downloads https://plugins.jetbrains.com/plugin/9038-octopus-deploy-integration/

What You Need to Do

Octopus Deploy recommends that you upgrade to the latest version (6.1.9). You can download the latest version of 6.1.9 from https://octopus.com/downloads or from https://plugins.jetbrains.com/plugin/9038-octopus-deploy-integration/

Mitigation

The previous mitigation provided were discovered to only limit exposure. There is no known mitigation for CVE-2021-45105, it is important to upgrade to a fixed version as soon as possible.

Support

If you have any questions or concerns regarding this advisory, please contact our support team https://octopus.com/support.