Cisco AnyConnect Secure Mobility Client for Windows Privilege Escalation (cisco-sa-ac-csc-privesc-wx4U4Kw)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(177079);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/12/01");

  script_cve_id("CVE-2023-20178");
  script_xref(name:"CISCO-BUG-ID", value:"CSCwe00252");
  script_xref(name:"CISCO-SA", value:"cisco-sa-ac-csc-privesc-wx4U4Kw");
  script_xref(name:"IAVA", value:"2023-A-0280-S");

  script_name(english:"Cisco AnyConnect Secure Mobility Client for Windows Privilege Escalation (cisco-sa-ac-csc-privesc-wx4U4Kw)");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is missing a vendor-supplied security patch.");
  script_set_attribute(attribute:"description", value:
"The version of Cisco AnyConnect Secure Mobility Client installed on the remote host is prior to 4.10.07061. It is, therefore,
affected by a privilege escalation vulnerability that exists because improper permissions are assigned to a temporary directory 
that is created during the upgrade process. An attacker could exploit this vulnerability by abusing a specific function of the 
Windows installer process. A successful exploit could allow the attacker to execute code with SYSTEM privileges. 

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ac-csc-privesc-wx4U4Kw
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?63627140");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwe00252");
  script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug ID CSCwe00252");
  script_set_attribute(attribute:"agent", value:"windows");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2023-20178");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2023/06/07");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/06/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/06/09");

  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:"generated_plugin", value:"former");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 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");

  exit(0);
}

include('vcf.inc');

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

vcf::check_granularity(app_info:app_info, sig_segments:3);
constraints = [
  { 'fixed_version' : '4.10.07061', 'fixed_display' : '4.10MR7 (4.10.07061)' }
];

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