AVM FRITZ!Box Default Password (FTP)

# SPDX-FileCopyrightText: 2017 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

CPE = "cpe:/o:avm:fritz%21_os";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.108043");
  script_version("2025-09-10T05:38:24+0000");
  script_tag(name:"last_modification", value:"2025-09-10 05:38:24 +0000 (Wed, 10 Sep 2025)");
  script_tag(name:"creation_date", value:"2017-01-11 11:00:00 +0100 (Wed, 11 Jan 2017)");
  script_tag(name:"cvss_base", value:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_name("AVM FRITZ!Box Default Password (FTP)");
  script_category(ACT_ATTACK);
  script_copyright("Copyright (C) 2017 Greenbone AG");
  script_family("Default Accounts");
  script_dependencies("gb_avm_fritz_box_consolidation.nasl", "DDI_FTP_Any_User_Login.nasl", "gb_default_credentials_options.nasl");
  script_require_ports("Services/ftp", 21);
  script_mandatory_keys("avm_fritz_box/ftp/detected");
  script_exclude_keys("default_credentials/disable_default_account_checks");

  script_tag(name:"summary", value:"This script detects if the device has a default password set.");

  script_tag(name:"vuldetect", value:"Check if it is possible to login with a default password.");

  script_tag(name:"impact", value:"This issue may be exploited by a remote attacker to gain
  access to sensitive information.");

  script_tag(name:"solution", value:"Set change the identified default password.");

  script_tag(name:"solution_type", value:"Workaround");
  script_tag(name:"qod_type", value:"remote_app");

  exit(0);
}

if(get_kb_item("default_credentials/disable_default_account_checks"))
  exit(0);

include("ftp_func.inc");
include("host_details.inc");
include("misc_func.inc");

users = make_list( "ftpuser",
                   "ftpuser-internet" );

pws = make_list( "1234",
                 "0000",
                 "admin",
                 "password",
                 "passwort" );

if( ! port = get_app_port( cpe:CPE, service:"ftp" ) )
  exit( 0 );

if( ! get_app_location( cpe:CPE, port:port, nofork:TRUE ) )
  exit( 0 );

if( ftp_broken_random_login( port:port) )
  exit( 0 );

banner = ftp_get_banner( port:port );
if( ! banner || "FRITZ!Box" >!< banner || "FTP server ready." >!< banner )
  exit( 0 );

foreach user( users ) {

  foreach pw( pws ) {

    if( ! soc = ftp_open_socket( port:port ) )
      continue;

    if( ftp_authenticate( socket:soc, user:user, pass:pw, skip_banner:TRUE ) ) {
      report = "It was possible to login using the following default credentials: '" + user + ":" + pw + "'.";
      security_message( port:port, data:report );
      ftp_close( socket:soc );
      exit( 0 );
    }
    ftp_close( socket:soc );
  }
}

exit( 99 );