Security Advisory
ZAA-2021-14
· Please read carefully and check if the version of your Zammad system is affected by this vulnerability. Please send us information regarding vulnerabilities in Zammad!
Security Advisory Details
- ID: ZAA-2021-14
- Date: 10/05/2021
- Title: Remote code execution due to insecure deserialisation
- Severity: medium
- Product: Zammad 1.0.x up to 4.1.0
- Fixed in: Zammad 4.1.1, 5.0.0
- References:
--> CVE: CVE-2021-42090
Vulnerability Descriptions
Remote code execution due to insecure deserialisation
Zammad comes with a Form functionality that can be embedded in a website by including a script which allows website visitors to create a Ticket via a form. However, there is a vulnerability in the deserialisation of the form data that allows the execution of malicious code in the context of the application server.
Special 🙏 and 🤘 and ❤️ to:
- N: Emil Virkki
- D: Security Researcher
- W: https://github.com/emilvirkki
Recommended Resolution
This vulnerability is fixed in the latest versions of Zammad and it is recommended to upgrade to one of these.
Fixed releases can be found at:
- https://zammad.org/
- https://ftp.zammad.com/
Or just update your Zammad if installed via OS package manager.
Additional information
Online version of this advisory: https://zammad.com/en/advisories/zaa-2021-14
Send all remarks to security issues to security@zammad.com.