ZAA-2020-02

Security Advisory Details

• ID: ZAA-2020-02
• Date: 03/03/2020
• Title: Persistent Cross-Site Scripting - File Upload (XSS)
• Severity: high
• Product: Zammad 1.0.x up to 3.2.0
• Fixed in: Zammad 3.2.1, 3.3.0
• References:
  --> CVE: 2020-10103

Vulnerability Descriptions

Persistent Cross-Site Scripting - File Upload (XSS) (CVE 2020-10103)

Malicious code can be provided by a low-privileged user through the File Upload functionality in Zammad. The malicious JavaScript will execute within the browser of any user who opens a specially crafted link to the uploaded file with an active Zammad session.

Special 🙏 and 🤘 and ❤️ to:

• N: TÜV Rheinland i-sec GmbH

• D: Security Researcher

• W: https://www.tuv.com

• N: Guardian Project

• W: https://guardianproject.info

• N: Center for Digital Resilience

• W: https://digiresilience.org

• N: James Kettle

• D: Director of Research at PortSwigger Web Security aka @Burp_Suite

• W: https://portswigger.net

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-2020-02

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