Cleartext Transmission of Sensitive Information via HTTP

# SPDX-FileCopyrightText: 2018 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("1.3.6.1.4.1.25623.1.0.108440");
  script_version("2023-09-07T05:05:21+0000");
  script_tag(name:"last_modification", value:"2023-09-07 05:05:21 +0000 (Thu, 07 Sep 2023)");
  script_tag(name:"creation_date", value:"2018-04-16 15:31:23 +0200 (Mon, 16 Apr 2018)");
  script_tag(name:"cvss_base", value:"4.8");
  script_tag(name:"cvss_base_vector", value:"AV:A/AC:L/Au:N/C:P/I:P/A:N");
  script_name("Cleartext Transmission of Sensitive Information via HTTP");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2018 Greenbone AG");
  script_family("Web application abuses");
  script_dependencies("webmirror.nasl", "DDI_Directory_Scanner.nasl");
  script_require_ports("Services/www", 80);
  script_mandatory_keys("www/pw_input_field_or_basic_auth/detected");

  script_xref(name:"URL", value:"https://www.owasp.org/index.php/Top_10_2013-A2-Broken_Authentication_and_Session_Management");
  script_xref(name:"URL", value:"https://www.owasp.org/index.php/Top_10_2013-A6-Sensitive_Data_Exposure");
  script_xref(name:"URL", value:"https://cwe.mitre.org/data/definitions/319.html");

  script_tag(name:"summary", value:"The host / application transmits sensitive information (username, passwords) in
  cleartext via HTTP.");

  script_tag(name:"vuldetect", value:"Evaluate previous collected information and check if the host / application is not
  enforcing the transmission of sensitive data via an encrypted SSL/TLS connection.

  The script is currently checking the following:

  - HTTP Basic Authentication (Basic Auth)

  - HTTP Forms (e.g. Login) with input field of type 'password'");

  script_tag(name:"impact", value:"An attacker could use this situation to compromise or eavesdrop on the
  HTTP communication between the client and the server using a man-in-the-middle attack to get access to
  sensitive data like usernames or passwords.");

  script_tag(name:"affected", value:"Hosts / applications which doesn't enforce the transmission of sensitive data via an
  encrypted SSL/TLS connection.");

  script_tag(name:"solution", value:"Enforce the transmission of sensitive data via an encrypted SSL/TLS connection.
  Additionally make sure the host / application is redirecting all users to the secured SSL/TLS connection before
  allowing to input sensitive data into the mentioned functions.");

  script_tag(name:"solution_type", value:"Workaround");
  script_tag(name:"qod_type", value:"remote_banner");

  exit(0);
}

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

inputFieldReport = 'The following input fields were identified (URL:input name):\n';
basicAuthReport  = 'The following URLs requires Basic Authentication (URL:realm name):\n';

port = http_get_port( default:80 );
if( get_port_transport( port ) > ENCAPS_IP ) exit( 99 );
host = http_host_name( dont_add_port:TRUE );

inputFieldList = get_kb_list( "www/" + host + "/" + port + "/content/pw_input_field/*" );
if( ! isnull( inputFieldList ) ) {

  # Sort to not report changes on delta reports if just the order is different
  inputFieldList = sort( inputFieldList );

  foreach inputField( inputFieldList ) {
    INPUT_VULN        = TRUE;
    inputFieldReport += '\n' + inputField;
  }
}

basicAuthList = get_kb_list( "www/" + host + "/" + port + "/content/basic_auth/*" );
if( ! isnull( basicAuthList ) ) {

  # Sort to not report changes on delta reports if just the order is different
  basicAuthList = sort( basicAuthList );

  foreach basicAuth( basicAuthList ) {
    BASIC_VULN       = TRUE;
    basicAuthReport += '\n' + basicAuth;
  }
}

if( INPUT_VULN || BASIC_VULN ) {

  if( INPUT_VULN )
    report = inputFieldReport;

  if( INPUT_VULN && BASIC_VULN )
    report += '\n\n';

  if( BASIC_VULN )
    report = basicAuthReport;

  security_message( port:port, data:report );
  exit( 0 );
}

exit( 99 );