Security Advisory

ZAA-2020-06

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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:

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:

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.

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