Palo Alto GlobalProtect Agent 4.1.x < 4.1.13 / 5.0.x < 5.0.5 Privilege Escalation

#
# (C) Tenable Network Security, Inc.
#

include('compat.inc');

if (description)
{
  script_id(135898);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/06/03");

  script_cve_id("CVE-2020-1988");
  script_xref(name:"IAVA", value:"2020-A-0137-S");

  script_name(english:"Palo Alto GlobalProtect Agent 4.1.x < 4.1.13 / 5.0.x < 5.0.5 Privilege Escalation");

  script_set_attribute(attribute:"synopsis", value:
"A VPN client installed on remote Windows host is affected by a privilege escalation vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Palo Alto GlobalProtect Agent installed on the remote Windows host is 4.1.x prior to 4.1.3, or 5.0.x
prior to 5.0.5. It is, therefore, affected by a privilege escalation vulnerability due to a problem with the file
creation permission on the OS disk. An authenticated, local attacker can exploit this to gain system
privileges.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://security.paloaltonetworks.com/CVE-2020-1988");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Palo Alto GlobalProtect Agent 4.1.3, 5.0.5, or later");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-1988");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/04/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/04/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/04/22");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:paloaltonetworks:globalprotect");
  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) 2020-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("palo_alto_globalprotect_agent_win_installed.nbin");
  script_require_keys("installed_sw/Palo Alto GlobalProtect Agent", "SMB/Registry/Enumerated");

  exit(0);
}

include('vcf.inc');

get_kb_item_or_exit('SMB/Registry/Enumerated');

app_info = vcf::get_app_info(app:'Palo Alto GlobalProtect Agent', win_local:TRUE);

vcf::check_granularity(app_info:app_info, sig_segments:3);

constraints = [
  {'min_version' : '4.1', 'fixed_version' : '4.1.13'},
  {'min_version' : '5.0', 'fixed_version' : '5.0.5'}
];

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