Cisco Adaptive Security Appliance (ASA) SSL VPN Portal Detection (HTTP)

# SPDX-FileCopyrightText: 2014 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("1.3.6.1.4.1.25623.1.0.105033");
  script_version("2025-10-08T05:38:55+0000");
  script_tag(name:"last_modification", value:"2025-10-08 05:38:55 +0000 (Wed, 08 Oct 2025)");
  script_tag(name:"creation_date", value:"2014-05-26 15:00:41 +0200 (Mon, 26 May 2014)");
  script_tag(name:"cvss_base", value:"0.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:N");

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

  script_name("Cisco Adaptive Security Appliance (ASA) SSL VPN Portal Detection (HTTP)");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2014 Greenbone AG");
  script_family("Product detection");
  script_dependencies("find_service.nasl", "httpver.nasl", "global_settings.nasl");
  script_require_ports("Services/www", 443);
  script_exclude_keys("Settings/disable_cgi_scanning");

  script_tag(name:"summary", value:"HTTP based detection of the SSL VPN Portal running on a Cisco
  Adaptive Security Appliance (ASA).");

  exit(0);
}

include("cpe.inc");
include("host_details.inc");
include("http_func.inc");
include("misc_func.inc");
include("os_func.inc");
include("port_service_func.inc");

port = http_get_port( default:443 );

host = http_host_name( port:port );

url = "/%2bCSCOE%2b/win.js";
finalconclurl = "  " + http_report_vuln_url( port:port, url:url, url_only:TRUE );

req = http_get( port:port, item:url );
res = http_send_recv( port:port, data:req);

if( ! res || "CSCO_WebVPN" >!< res )
  exit( 0 );

url = "/%2bCSCOE%2b/logon.html";
conclurl = http_report_vuln_url( port:port, url:url, url_only:TRUE );

req = http_get( port:port, item:url );
res = http_send_recv( port:port, data:req );

# nb: Some specific (probably older or different configured) devices hasn't returned anything on the
# URL above. In the browser (maybe due to some cookies set) we're getting redirected (via HTTP/1.0
# 302 Moved Temporarily) to this new URL so we're trying that as well.
if( ! res || res !~ "^HTTP/1\.[01] 200" ) {

  url = "/CACHE/sdesktop/install/start.htm";

  req = http_get( port:port, item:url );
  res = http_send_recv( port:port, data:req );

  if( ! res || res !~ "^HTTP/1\.[01] 200" || res !~ "Cisco Secure Desktop" )
    exit( 0 );

  conclurl = http_report_vuln_url( port:port, url:url, url_only:TRUE );
}

finalconclurl += '\n  ' + conclurl;

uid = rand_str( length:128, charset:"ABCDEF0123456789" );

set_kb_item( name:"cisco/asa/webvpn/detected", value:TRUE );
set_kb_item( name:"cisco/asa/webvpn/http/detected", value:TRUE );

xml = '<?xml version="1.0" encoding="UTF-8"?>\r\n' +
      '<config-auth client="vpn" type="init" aggregate-auth-version="2">\r\n' +
      '<version who="vpn">3.1.05160</version>\r\n' +
      '<device-id device-type="MacBookAir4,1" platform-version="10.9.2" unique-id="' + uid + '">mac-intel</device-id>\r\n' +
      '<mac-address-list>\r\n' +
      '<mac-address>00:00:00:00:00:00</mac-address></mac-address-list>\r\n' +
      '<group-select>VPN</group-select>\r\n' +
      '<group-access>https://' + host + '</group-access>\r\n' +
      '</config-auth>';
len = strlen( xml );

req = 'POST / HTTP/1.1\r\n' +
      'Connection: close\r\n' +
      'Content-Length: ' + len + '\r\n' +
      'X-Transcend-Version: 1\r\n' +
      'Accept: */*\r\n' +
      'Host: ' + host + '\r\n' +
      'X-AnyConnect-Platform: mac-intel\r\n' +
      'Accept-Encoding: identity\r\n' +
      'X-Aggregate-Auth: 1\r\n' +
      'User-Agent: AnyConnect Darwin_i386 3.1.05160\r\n\r\n' +
      xml;
res = http_send_recv( port:port, data:req );

# nb: Newer versions of the ASA VPN Portal doesn't offer the version anymore and requires the user
# to login first to continue.
version = "unknown";
install = "/";

# <version who="sg">8.4(1)</version>
# or:
# 9.0(2)
vers = eregmatch( string:res, pattern:"<version.*>([^<]+)</version>" );
if( ! isnull( vers[1] ) )
  version = vers[1];

app_cpe = build_cpe( value:version, exp:"^([0-9.()]+)", base:"cpe:/a:cisco:asa:" );
if( ! app_cpe )
  app_cpe = "cpe:/a:cisco:asa";

os_cpe = build_cpe( value:version, exp:"^([0-9.()]+)", base:"cpe:/o:cisco:adaptive_security_appliance_software:" );
if( ! os_cpe )
  os_cpe = "cpe:/o:cisco:adaptive_security_appliance_software";

os_register_and_report( os:"Cisco Adaptive Security Appliance (ASA)", cpe:os_cpe,
                        banner_type:"Cisco Adaptive Security Appliance (ASA) SSL VPN Portal",
                        banner:vers[0], desc:"Cisco Adaptive Security Appliance (ASA) SSL VPN Portal (HTTP)",
                        runs_key:"unixoide" );

register_product( cpe:app_cpe, location:install, port:port, service:"www" );
register_product( cpe:os_cpe, location:install, port:port, service:"www" );

report =  build_detection_report( app:"Cisco Adaptive Security Appliance (ASA) SSL VPN Portal",
                                  version:version,
                                  install:install,
                                  cpe:app_cpe );
report += '\n\n';
report += build_detection_report( app:"Cisco Adaptive Security Appliance (ASA)",
                                  version:version,
                                  install:install,
                                  cpe:os_cpe );
report += '\n\n';

if( vers[0] )
  report += 'Concluded from version/product identification result (Gathered via a VPN connection request):\n\n' + version[0] + '\n\n';
report += 'Concluded from version/product identification location:\n' + finalconclurl;

log_message( port:port, data:report );

exit( 0 );