ZAA-2021-04

Security Advisory Details

• ID: ZAA-2021-04
• Date: 06/08/2020
• Title: Incorrect access control for linked Tickets
• Severity: medium
• Product: Zammad 1.0.x up to 4.0.0
• Fixed in: Zammad 4.0.1, 4.1.0
• References:
  --> CVE: CVE-2021-35302

Vulnerability Descriptions

Incorrect access control for linked Tickets

Zammad comes with a functionality to link Tickets to one another. This enables to create a context of the current topic at hand. While gathering all linked Tickets of the current Ticket the access control was faulty. This way an attacker could see information that should not be accessible.

Special 🙏 and 🤘 and ❤️ to:

• N: Alexander Willner
• D: Wissenschaftlicher Mitarbeiter bei Fraunhofer FOKUS
• W: https://www.linkedin.com/in/willner/

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-2021-04

Send all remarks to security issues to security@zammad.com.