Security Advisory 2021-10
| Summary | Remote Code Execution in Octopus Tentacle (CVE-2021-31819) |
| Advisory Number | 2021-10 |
| Discovery Date | 21 Jul 2021 |
| Patch Release Date | 17 Sep 2021 |
| Advisory Release Date | 22 Sep 2021 |
| Product | Octopus Tentacle |
| Operating System | Linux and Windows |
| Severity | High |
| CVE ID | CVE-2021-31819 |
Customers who have downloaded and installed any of the Octopus Tentacle versions listed below ("Details") are affected.
Please upgrade your Octopus Tentacle immediately to fix this vulnerability.
Customers who have upgraded Octopus Tentacle to version 6.1.938 or higher are not affected.
Severity
Octopus Deploy has given this vulnerability a high 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
Octopus Tentacle uses Halibut as its communication framework. There was a deserialisation vulnerability discovered in Halibut which could allow remote code execution on Octopus Server from a trusted tentacle.
All versions of Octopus Tentacle are affected by this vulnerability.
Fix
To address this vulnerability, we have released Octopus Tentacle version:
- 6.1.938
The latest versions of Octopus Deploy products can be downloaded from https://octopus.com/downloads and previous versions can be downloaded from https://octopus.com/downloads/previous
What You Need to Do
Octopus Deploy recommends that you upgrade to the latest version (6.1.938). You can download the latest version of Octopus Tentacle from https://octopus.com/downloads
If you can't upgrade to the latest version (6.1.938):
| If you have feature version... | ...then upgrade to this version |
|---|---|
| 3.x or greater | 6.1.938 |
For Octopus Tentacle versions before 3.x please contact our support team (https://octopus.com/support ) for advice on upgrading to the latest version.
Mitigation
There is no known mitigation for CVE-2021-31819, 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.
Exploitation and Public Announcements
The Octopus Deploy security team is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.