Brother Multiple Devices Default Credentials (Telnet)

# SPDX-FileCopyrightText: 2016 SCHUTZWERK GmbH
# 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-or-later

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.111092");
  script_version("2023-07-26T05:05:09+0000");
  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("Brother Multiple Devices Default Credentials (Telnet)");
  script_tag(name:"last_modification", value:"2023-07-26 05:05:09 +0000 (Wed, 26 Jul 2023)");
  script_tag(name:"creation_date", value:"2016-03-26 18:12:12 +0100 (Sat, 26 Mar 2016)");
  script_category(ACT_ATTACK);
  script_family("Default Accounts");
  script_copyright("Copyright (C) 2016 SCHUTZWERK GmbH");
  script_dependencies("telnetserver_detect_type_nd_version.nasl", "gb_default_credentials_options.nasl");
  script_require_ports("Services/telnet", 23);
  script_mandatory_keys("telnet/brother/device/detected");
  script_exclude_keys("default_credentials/disable_default_account_checks");

  script_tag(name:"summary", value:"The remote Brother Device has a default password set.");

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

  script_tag(name:"vuldetect", value:"Connect to the telnet service and try to login with a default password.");

  script_tag(name:"insight", value:"It was possible to login with default password 'access' or without any password.");

  script_tag(name:"solution", value:"Change/Set the password.");

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

  exit(0);
}

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

include("telnet_func.inc");
include("misc_func.inc");
include("port_service_func.inc");
include("dump.inc");

port = telnet_get_port(default:23);
banner = telnet_get_banner( port:port );
if(!banner || "Welcome. Type <return>, enter password at # prompt" >!< banner )
  exit( 0 );

soc = open_sock_tcp( port );
if( ! soc ) exit( 0 );

send( socket:soc, data: '\r\naccess\r\n\r\n' );
recv = recv( socket:soc, length:512 );

send( socket:soc, data: '\r\n' );
recv = recv( socket:soc, length:512 );

send( socket:soc, data: 'show version\r\n' );
recv = recv( socket:soc, length:512 );
close( soc );

if( "Brother" >< recv ) {
  security_message( port:port, data:'It was possible to login using the default password "access" or no password and any username.' );
  exit( 0 );
}

exit( 99 );