Palo Alto GlobalProtect App Windows VPN kernel 5.1.x < 5.1.8 / 5.2.x < 5.2.4 DoS

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

include('compat.inc');

if (description)
{
  script_id(148974);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/08/27");

  script_cve_id("CVE-2021-3038");
  script_xref(name:"IAVA", value:"2021-A-0181-S");

  script_name(english:"Palo Alto GlobalProtect App Windows VPN kernel 5.1.x < 5.1.8 / 5.2.x < 5.2.4 DoS");

  script_set_attribute(attribute:"synopsis", value:
"A VPN client installed on remote Windows host is affected by a denial-of-service (DoS) vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Palo Alto GlobalProtect Agent installed on the remote Windows host is 5.1.x prior to 5.1.8, or 5.2.x
prior to 5.2.4. It is, therefore, affected by a denial-of-service (DoS) vulnerability. A denial-of-service (DoS)
vulnerability in Palo Alto Networks GlobalProtect app on Windows systems allows a limited Windows user to send
specifically-crafted input to the GlobalProtect app that results in a Windows blue screen of death (BSOD) error.

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-2021-3038");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Palo Alto GlobalProtect Agent 5.1.8, 5.2.4 or later");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:N/I:N/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:L/UI:N/S:U/C:N/I:N/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-2021-3038");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_cwe_id(20, 248);

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/04/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/04/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/04/23");

  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) 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');

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

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

var constraints = [
  {'min_version' : '5.1', 'fixed_version' : '5.1.8'},
  {'min_version' : '5.2', 'fixed_version' : '5.2.4'}
];

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