IPmux-2L TDM Pseudowire Access Gateway Default Credentials (Telnet)

# SPDX-FileCopyrightText: 2013 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("1.3.6.1.4.1.25623.1.0.103860");
  script_version("2023-07-27T05:05:08+0000");
  script_tag(name:"cvss_base", value:"9.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:C/I:P/A:P");
  script_tag(name:"last_modification", value:"2023-07-27 05:05:08 +0000 (Thu, 27 Jul 2023)");
  script_tag(name:"creation_date", value:"2013-12-18 11:44:04 +0200 (Wed, 18 Dec 2013)");
  script_name("IPmux-2L TDM Pseudowire Access Gateway Default Credentials (Telnet)");

  script_xref(name:"URL", value:"http://dariusfreamon.wordpress.com/2013/12/17/ipmux-2l-tdm-pseudowire-access-gateway-default-credentials/");

  script_category(ACT_ATTACK);
  script_tag(name:"qod_type", value:"remote_vul");
  script_family("Default Accounts");
  script_copyright("Copyright (C) 2013 Greenbone AG");
  script_dependencies("telnetserver_detect_type_nd_version.nasl", "gb_default_credentials_options.nasl");
  script_require_ports("Services/telnet", 23);
  script_mandatory_keys("telnet/ipmux-2l/tdm/detected");
  script_exclude_keys("default_credentials/disable_default_account_checks");

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

  script_tag(name:"solution_type", value:"Mitigation");

  script_tag(name:"summary", value:"The remote IPmux-2L TDM Pseudowire Access Gateway
  is using known default credentials.");

  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:"insight", value:"It was possible to login as user 'SU' with password '1234'.");

  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 || "IPmux-2L" >!< banner)
  exit(0);

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

buf = recv(socket:soc, length:4096);

if("IPmux-2L" >!< buf) {
  close(soc);
  exit(0);
}

send(socket:soc, data:'SU\r\n1234\r\n\r\n');

buf = recv(socket:soc, length:4096);
close(soc);

if("main menu" >< buf && "Inventory" >< buf && "Configuration" >< buf) {
  security_message(port:port);
  exit(0);
}

exit(99);