ZAA-2020-15

Security Advisory Details

• ID: ZAA-2020-15
• Date: 09/22/2020
• Title: Application Functionality Can Be Used to perform Server-Side Request Forgery
• Severity: medium
• Product: Zammad 1.0.x up to 3.4.0
• Fixed in: Zammad 3.4.1, 3.5.0
• References:
  --> CVE: 2020-26032

Vulnerability Descriptions

Application Functionality Can Be Used to perform Server-Side Request Forgery

The Zammad application's SMS configuration interface for Massenversand is implemented in a way that it renders the result of the test request to the User. An attacker can use this to request any URL via a GET request from the network interface of the server. This may lead to disclosure of information from internal systems.

Special 🙏 and 🤘 and ❤️ to:

• N: Michał Błaszczak
• W: http://blaszczakm.blogspot.com/
• T: https://twitter.com/w4cky_
• F: https://www.facebook.com/blaszczakm
• L: https://www.linkedin.com/in/micha%C5%82-b%C5%82aszczak-sec/
• C: Zdalny Admln
• C-F: https://www.facebook.com/ZDALNYADMIN
• C-W: https://remoteadmin.store/
• C-T: https://twitter.com/ZdalnyA
• C-L: https://www.linkedin.com/company/zdalnyadmin/

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-2020-15

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