Zyxel Router Default Credentials (HTTP)

# SPDX-FileCopyrightText: 2005 Michel Arboi
# 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("1.3.6.1.4.1.25623.1.0.17304");
  script_version("2023-08-03T05:05:16+0000");
  script_tag(name:"last_modification", value:"2023-08-03 05:05:16 +0000 (Thu, 03 Aug 2023)");
  script_tag(name:"creation_date", value:"2005-11-03 14:08:04 +0100 (Thu, 03 Nov 2005)");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/6671");
  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_cve_id("CVE-2001-1135", "CVE-1999-0571");
  script_name("Zyxel Router Default Credentials (HTTP)");
  script_category(ACT_ATTACK);
  script_copyright("Copyright (C) 2005 Michel Arboi");
  script_family("Default Accounts");
  script_dependencies("gb_get_http_banner.nasl", "gb_default_credentials_options.nasl");
  script_mandatory_keys("ZyXEL-RomPager/banner");
  script_require_ports("Services/www", 80);
  script_exclude_keys("default_credentials/disable_default_account_checks");

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

  script_tag(name:"summary", value:"The remote host is a Zyxel router with its default password set.");

  script_tag(name:"impact", value:"An attacker could connect to the web interface and reconfigure it.");

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

  exit(0);
}

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

include("http_func.inc");
include("http_keepalive.inc");
include("port_service_func.inc");
include("misc_func.inc");

port = http_get_port(default:80);

banner = http_get_remote_headers(port:port);
if(!banner || "ZyXEL-RomPager" >!< banner)
  exit(0);

res = http_get_cache(item:"/", port:port);
if(!res || res !~ "^HTTP/1\.[01] +401 ")
  exit(0);

req = http_get_req(port:port, url:"/", add_headers:make_array("Authorization", "Basic YWRtaW46MTIzNA=="));
res = http_send_recv(port:port, data:req);
if(res =~ "^HTTP/1\.[01] +200 ") {
  security_message(port:port);
  exit(0);
}

exit(99);