Audemat FMB80 RDS Encoder 'root' Default Credentials (Telnet)

# SPDX-FileCopyrightText: 2014 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

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.103898");
  script_version("2023-07-27T05:05:08+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("Audemat FMB80 RDS Encoder 'root' Default Credentials (Telnet)");

  script_xref(name:"URL", value:"http://dariusfreamon.wordpress.com/2014/01/28/audemat-fmb80-rds-encoder-default-root-credentials/");

  script_tag(name:"last_modification", value:"2023-07-27 05:05:08 +0000 (Thu, 27 Jul 2023)");
  script_tag(name:"creation_date", value:"2014-01-29 15:02:06 +0200 (Wed, 29 Jan 2014)");
  script_category(ACT_ATTACK);
  script_tag(name:"qod_type", value:"remote_vul");
  script_family("Default Accounts");
  script_copyright("Copyright (C) 2014 Greenbone AG");
  script_dependencies("telnetserver_detect_type_nd_version.nasl", "gb_default_credentials_options.nasl");
  script_require_ports("Services/telnet", 23);
  script_exclude_keys("default_credentials/disable_default_account_checks");

  script_tag(name:"summary", value:"The remote Audemat FMB80 RDS Encoder has no or default credentials 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, if needed, try to login with default credentials.");

  script_tag(name:"insight", value:"It was possible to login without credentials or default credentials of root:root.");

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

  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");

port = telnet_get_port( default:23 );

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

recv = recv( socket:soc, length:2048 );
if( "FMB80" >!< recv )
  exit( 0 );

if( "User:" >< recv ) {
  pass_needed = TRUE;

  send( socket:soc, data:'root\r\n' );
  recv = recv( socket:soc, length:128 );
  if( "Password:" >!< recv )
    exit( 0 );

  send( socket:soc, data:'root\r\n' );
  recv = recv( socket:soc, length:128 );
  if( "Type HELP" >!< recv )
    exit( 99 );
}

send( socket:soc, data:'USER?\r\n' );
recv = recv( socket:soc, length:128 );

close( soc );

if( "Root" >< recv ) {
  if ( pass_needed )
    report = 'It was possible to login using the following credentials:\n\nroot:root\n';
  else
    report = 'The remote telnet service is not protected by any credentials.';

  security_message( port:port, data:report );
  exit( 0 );
}

exit( 99 );