arrow-left arrow-right autosave chat checkmark close dashboard fields fingerprint flash hamburger language list lock logotype long-arrow-right marker migrate overviews phone rocket search smiley stamp star stopwatch team twitter

Please read carefully and check if the version of your Zammad system is affected by this vulnerability. Please send information regarding vulnerabilities in Zammad to: security at zammad.com

Security Advisory Details

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:

Or just update your Zammad if installed via OS package manager.

Additional information

Online version of this advisory: https://zammad.com/news/security-advisory-zaa-2020-15

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