Microsoft PowerShell Core DoS And Security Feature Bypass Vulnerabilities - Linux

# 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:microsoft:powershell";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.812747");
  script_version("2024-02-15T05:05:40+0000");
  script_cve_id("CVE-2018-0764", "CVE-2018-0786");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:P/A:N");
  script_tag(name:"last_modification", value:"2024-02-15 05:05:40 +0000 (Thu, 15 Feb 2024)");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2019-10-03 00:03:00 +0000 (Thu, 03 Oct 2019)");
  script_tag(name:"creation_date", value:"2018-01-30 15:21:20 +0530 (Tue, 30 Jan 2018)");
  script_name("Microsoft PowerShell Core DoS And Security Feature Bypass Vulnerabilities - Linux");

  script_tag(name:"summary", value:"This host is missing an important security
  update for PowerShell Core according to Microsoft security update January 2018.");

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

  script_tag(name:"insight", value:"Multiple flaws are due to:

  - An error in the open source versions of PowerShell Core when improper
    processing of XML documents by .NET Core occurs.

  - An error in the open source versions of PowerShell Core where an attacker
    could present a certificate that is marked invalid for a specific use,
    but a .NET Core component uses it for that purpose. This action disregards
    the Enhanced Key Usage tagging.");

  script_tag(name:"impact", value:"Successful exploitation will allow remote
  attackers to cause a denial of service to an application using PowerShell
  to process requests and also to bypass security.");

  script_tag(name:"affected", value:"PowerShell Core version 6.0.0 before 6.0.1");

  script_tag(name:"solution", value:"Update PowerShell Core to version 6.0.1 or
  later.");

  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"qod_type", value:"executable_version");
  script_xref(name:"URL", value:"https://github.com/PowerShell/Announcements/issues/2");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2018 Greenbone AG");
  script_family("General");
  script_dependencies("gb_powershell_core_detect_lin.nasl");
  script_mandatory_keys("PowerShell/Linux/Ver");
  exit(0);
}

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

if(!infos = get_app_version_and_location(cpe:CPE, exit_no_version:TRUE)) exit(0);
psVer = infos['version'];
psPath = infos['location'];

if(psVer =~ "^(6\.0)" && version_is_less(version:psVer, test_version:"6.0.1"))
{
  report = report_fixed_ver(installed_version:psVer, fixed_version:"6.0.1", install_path:psPath);
  security_message(data:report);
  exit(0);
}
exit(0);