Cisco AnyConnect Secure Mobility Client for Windows with VPN Posture (HostScan) Module DLL Hijacking Vulnerability (cisco-sa-anyconnect-pos-dll-ff8j6dFv)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(150811);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/01/26");

  script_cve_id("CVE-2021-1567");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvx52084");
  script_xref(name:"CISCO-SA", value:"cisco-sa-anyconnect-pos-dll-ff8j6dFv");
  script_xref(name:"IAVA", value:"2021-A-0290-S");

  script_name(english:"Cisco AnyConnect Secure Mobility Client for Windows with VPN Posture (HostScan) Module DLL Hijacking Vulnerability (cisco-sa-anyconnect-pos-dll-ff8j6dFv)");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is missing a vendor-supplied security patch (cisco-sa-anyconnect-pos-dll-ff8j6dFv)");
  script_set_attribute(attribute:"description", value:
"The version of tested product installed on the remote host is prior to tested version. It is, therefore, affected by a
vulnerability as referenced in the cisco-sa-anyconnect-pos-dll-ff8j6dFv advisory. Note that Nessus has not tested for
this issue but has instead relied only on the application's self-reported version number.");
  # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-anyconnect-pos-dll-ff8j6dFv
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?56ff9e0a");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvx52084");
  script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvx52084");
  script_set_attribute(attribute:"agent", value:"windows");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:H/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-1567");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploit_framework_core", value:"true");
  script_cwe_id(367);

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/06/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/06/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/06/16");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:cisco:anyconnect_secure_mobility_client");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Windows");

  script_copyright(english:"This script is Copyright (C) 2021-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("cisco_anyconnect_vpn_installed.nasl");
  script_require_keys("installed_sw/Cisco AnyConnect Secure Mobility Client", "SMB/Registry/Enumerated");
  script_require_ports(139, 445);

  exit(0);
}

include('vcf.inc');
include('smb_hotfixes_fcheck.inc');

var app_info = vcf::get_app_info(app:'Cisco AnyConnect Secure Mobility Client', win_local:TRUE);

var hostscan_installed = FALSE;

var uninstall_entry = hotfix_displayname_in_uninstall_key(pattern:'Cisco AnyConnect Posture Module');
if (!empty_or_null(uninstall_entry))
{
  var path_key = str_replace(string:uninstall_entry, find:'DisplayName', replace:'InstallLocation');
  var hostscan_path = get_kb_item(path_key);
  if (!empty_or_null(hostscan_path))
  {
    var exe_path = hotfix_append_path(path:hostscan_path, value:"bin\cscan.exe");
    hotfix_check_fversion_init();
    if (hotfix_file_exists(path:exe_path))
      hostscan_installed = TRUE;
    hotfix_check_fversion_end();
  }
}

if (!hostscan_installed)
  audit(AUDIT_NOT_INST, 'Cisco HostScan (Cisco AnyConnect Posture Module)');

vcf::check_granularity(app_info:app_info, sig_segments:3);
var constraints = [
  { 'fixed_version' : '4.10.01075.0', 'fixed_display' : 'See vendor advisory' }
];

vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_WARNING);