Security Advisory 2025-05
| Summary | Denial of Service with Backdoor access |
| Advisory Number | 2025-05 |
| Discovery Date | 18 NOV 2024 |
| Patch Release Date | 22 JAN 2025 |
| Advisory Release Date | 10 FEB 2025 |
| Product | Octopus Server |
| Operating System | Linux and Microsoft Windows |
| Severity | Medium |
| CVE ID | CVE-2025-0588 |
Customers who have downloaded and installed any of the Octopus Server versions listed below ("Details") are affected.
Please upgrade your Octopus Server immediately to fix this vulnerability.
Customers who have upgraded Octopus Server to version 2024.4.7132 or higher are not affected.
Severity
Octopus Deploy has given this vulnerability a Medium 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
In affected versions of Octopus Server it was possible for a user with sufficient access to set custom headers in all server responses. By submitting a specifically crafted referrer header the user could ensure that all subsequent server responses would return 500 errors rendering the site mostly unusable. The user would be able to subsequently set and unset the referrer header to control the denial of service state with a valid CSRF token whilst new CSRF tokens could not be generated.
The versions of Octopus Server affected by this vulnerability are:
- All 2020.x, 2021.x, 2022.x, 2023.x versions
- All 2024.1.x, 2024.2.x versions
- All 2024.3.x versions before 2023.3.13097
- All 2024.4.x versions before 2024.4.7091
Fix
To address this vulnerability, we have released Octopus Server version:
- 2024.4.7091
- 2024.3.13097
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 (2024.4.7132). You can download the latest version of Octopus Server from https://octopus.com/downloads
If you can't upgrade to the latest version (2024.4.7132):
| If you have feature version... | ...then upgrade to this version |
|---|---|
| 2020.x, 2021.x, 2022.x, 2023.x | 2024.3.13097 or greater |
| 2024.1.x, 2024.2.x | 2024.3.13097 or greater |
| 2024.3.x | 2024.3.13097 or greater |
| 2024.4.x | 2024.4.7091 or greater |
Mitigation
There is no known mitigation for CVE-2025-0588, 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.
Source
This vulnerability was found by Edward Prior (@JankhJankh)