Security Advisory
ZAA-2020-06
· 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-2020-06
- Date: 03/03/2020
- Title: WebSocket Server DoS
- Severity: medium
- Product: Zammad 1.0.x up to 3.2.0
- Fixed in: Zammad 3.2.1, 3.3.0
- References:
--> CVE: CVE-2020-10101
Vulnerability Descriptions
WebSocket Server DoS (CVE CVE-2020-10101)
Zammads WebSocket server crashes when messages in non-JSON format are sent by an attacker. The message format is not properly checked and parsing errors not handled. This leads to a crash of the service process.
Special 🙏 and 🤘 and ❤️ to:
- N: Martin von Wittich
- D: Security Researcher
- W: https://twitter.com/martinvwittich
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-2020-06
Send all remarks to security issues to security@zammad.com.