In fail2ban 0.10.5 through 1.1.1 before ddd879d, the sshd filter (config/filter.d/sshd.conf) accepts an "on <token>" suffix after the host address. Because OpenSSH logs the offered username verbatim, a remote unauthenticated attacker can us…

{
                    "defaultStatus": "unknown",
                    "modules": [
                        "sshd filter"
                    ],
                    "platforms": [
                        "Linux",
                        "Unix"
                    ],
                    "product": "fail2ban",
                    "programFiles": [
                        "config/filter.d/sshd.conf"
                    ],
                    "repo": "https://github.com/fail2ban/fail2ban",
                    "vendor": "fail2ban",
                    "versions": [
                        {
                            "lessThanOrEqual": "1.1.1",
                            "status": "affected",
                            "version": "0.10.5",
                            "versionType": "custom"
                        }
                    ]
                }