Kaseya Virtual System Administrator Agent <= 9.4.0.36 Local Privilege Escalation Vulnerability

# SPDX-FileCopyrightText: 2018 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

CPE = "cpe:/a:kaseya:virtual_system_administrator";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.813382");
  script_version("2024-06-26T05:05:39+0000");
  script_cve_id("CVE-2017-12410");
  script_tag(name:"cvss_base", value:"6.9");
  script_tag(name:"cvss_base_vector", value:"AV:L/AC:M/Au:N/C:C/I:C/A:C");
  script_tag(name:"last_modification", value:"2024-06-26 05:05:39 +0000 (Wed, 26 Jun 2024)");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2018-10-09 20:01:00 +0000 (Tue, 09 Oct 2018)");
  script_tag(name:"creation_date", value:"2018-05-30 11:18:44 +0530 (Wed, 30 May 2018)");
  script_name("Kaseya Virtual System Administrator Agent <= 9.4.0.36 Local Privilege Escalation Vulnerability");

  script_tag(name:"summary", value:"Kaseya Virtual System Administrator agent is prone to a local privilege escalation vulnerability.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");

  script_tag(name:"insight", value:"The flaw exists due to a Time of Check &
  Time of Use (TOCTOU) issue when VSA agent performs verification if the
  files were modified before running the executables.");

  script_tag(name:"impact", value:"Successful exploitation will allow an
  attacker to run arbitrary executables with 'NT AUTHORITY\SYSTEM' privileges.");

  script_tag(name:"affected", value:"Kaseya Virtual System Administrator
  agent 9.4.0.36 and earlier.");

  script_tag(name:"solution", value:"Upgrade to Kaseya Virtual System
  Administrator version 9.4.0.37 or 9.5 or later.");

  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"qod_type", value:"remote_banner");
  script_xref(name:"URL", value:"https://www.securityfocus.com/archive/1/archive/1/541884/100/0/threaded");
  script_xref(name:"URL", value:"https://helpdesk.kaseya.com/hc/en-gb/articles/360002367172-CVE-2017-12410-TOCTOU-Flaw-in-the-VSA-s-Agent-");

  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2018 Greenbone AG");
  script_family("Web application abuses");
  script_dependencies("gb_kaseya_vsa_detect.nasl");
  script_mandatory_keys("kaseya/vsa/detected");
  exit(0);
}

include("host_details.inc");
include("version_func.inc");

if(!port = get_app_port(cpe:CPE))
  exit(0);

if (!version = get_kb_item("kaseya_vsa/patchlevel"))
  if (!version = get_app_version(cpe: CPE, port: port))
    exit(0);

if(version_is_less(version:version, test_version:"9.4.0.37")) {
  report = report_fixed_ver(installed_version:version, fixed_version: "9.4.0.37 or 9.5");
  security_message(port:port, data: report);
  exit(0);
}

exit(99);