WatchGuard Firebox and XTM appliances allow an authenticated remote attacker to read arbitrary text files from the filesystem via the Fireware management command line interface.
Affected
Fireware OS before 12.9.3
Resolution
Fireware OS 12.9.3
Workaround
In order to successfully exploit this vulnerability, an attacker must successfully authenticate using a management account (read-only or read-write) to the Fireware command line interface. Firebox administrators should follow the best practices described here to securely enable remote Firebox management where needed.
Credits
Reported by independent security researcher Ren9IE