Security Advisory 2021-11
| Summary | Local privilege escalation in Octopus Tentacle (CVE-2021-31822) |
| Advisory Number | 2021-11 |
| Discovery Date | 31 Aug 2021 |
| Patch Release Date | 08 Nov 2021 |
| Advisory Release Date | 24 Nov 2021 |
| Product | Octopus Tentacle |
| Operating System | Linux |
| Severity | High |
| CVE ID | CVE-2021-31822 |
Customers who have upgraded Octopus Tentacle to version 6.1.1116 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
When Octopus Tentacle is installed on a Linux operating system, the systemd service file permissions are misconfigured. This could lead to a local unprivileged user modifying the contents of the systemd service file to gain privileged access.
All versions of Octopus Tentacle are affected by this vulnerability.
Fix
To address this vulnerability, we have released Octopus Tentacle version:
- 6.1.1116
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 (6.1.1116). You can download the latest version of
If you can't upgrade to the latest version (6.1.1116):
| If you have feature version... | ...then upgrade to this version |
|---|---|
| 3.x or greater | 6.1.1116 |
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
The file permissions for the systemd unit file can be manually updated to “644" by using the "chmod" command. The installation location for the Tentacle systemd unit file is:
1/etc/systemd/system/<Name of Tentacle instance (default Tentacle)>.service
For the default Tentacle instance name the mitigation is:
1chmod 644 /etc/systemd/system/Tentacle.service
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.
Source
This vulnerability was found by an Octopus Deploy customer.