NEC Enterprise Server Backdoor Account (Telnet)

# SPDX-FileCopyrightText: 2012 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("1.3.6.1.4.1.25623.1.0.103498");
  script_version("2023-07-25T05:05:58+0000");
  script_name("NEC Enterprise Server Backdoor Account (Telnet)");
  script_tag(name:"cvss_base", value:"10.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_tag(name:"last_modification", value:"2023-07-25 05:05:58 +0000 (Tue, 25 Jul 2023)");
  script_tag(name:"creation_date", value:"2012-06-21 10:41:21 +0200 (Thu, 21 Jun 2012)");
  script_category(ACT_ATTACK);
  script_family("Default Accounts");
  script_tag(name:"solution_type", value:"WillNotFix");
  script_copyright("Copyright (C) 2012 Greenbone AG");
  script_dependencies("find_service.nasl", "gb_default_credentials_options.nasl");
  script_require_ports(5001);
  script_exclude_keys("default_credentials/disable_default_account_checks");

  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/53493");

  script_tag(name:"summary", value:"NEC Enterprise Server is using a backdoor account in all
  versions of the application.");

  script_tag(name:"impact", value:"Attackers can exploit this issue to gain unauthorized access to the
  affected application. This may aid in further attacks.");

  script_tag(name:"solution", value:"No known solution was made available for at least one year since the
  disclosure of this vulnerability. Likely none will be provided anymore. General solution options are to
  upgrade to a newer release, disable respective features, remove the product or replace the product by
  another one.");

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

  exit(0);
}

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

include("telnet_func.inc");

port = 5001;
if( ! get_port_state( port ) ) exit( 0 );

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

r = telnet_negotiate( socket:soc );

if( "Integrated Service Processor" >!< r ) exit( 0 );

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

if( "iSP password" >!< recv ) exit( 0 );

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

close( soc );

if( "Welcome to Integrated Service Processor" >< recv && "iSP FW version" >< recv ) {
  security_message( port:port );
  exit( 0 );
}

exit( 99 );