Apple Mac OS X High Sierra Local Root Authentication Bypass Vulnerability

# SPDX-FileCopyrightText: 2017 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

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.812305");
  script_version("2024-02-09T14:47:30+0000");
  script_tag(name:"cvss_base", value:"9.3");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:C/I:C/A:C");
  script_tag(name:"last_modification", value:"2024-02-09 14:47:30 +0000 (Fri, 09 Feb 2024)");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:N/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:"2017-12-30 02:29:00 +0000 (Sat, 30 Dec 2017)");
  script_tag(name:"creation_date", value:"2017-11-29 15:25:36 +0530 (Wed, 29 Nov 2017)");

  script_cve_id("CVE-2017-13872");

  script_name("Apple Mac OS X High Sierra Local Root Authentication Bypass Vulnerability");

  script_tag(name:"summary", value:"Apple Mac OS X High Sierra is prone to local root authentication bypass 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 an error which
  allows anyone to log into system as root with empty password.");

  script_tag(name:"impact", value:"Successful exploitation will allow local
  attacker to gain administrative access to the system.");

  script_tag(name:"affected", value:"Apple Mac OS X version 10.13.x");

  script_tag(name:"solution", value:"Upgrade to Apple Mac OS X 10.13.2 or later.");

  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"qod_type", value:"package");
  script_xref(name:"URL", value:"https://thehackernews.com/2017/11/mac-os-password-hack.html");
  script_xref(name:"URL", value:"https://techcrunch.com/2017/11/28/astonishing-os-x-bug-lets-anyone-log-into-a-high-sierra-machine");
  script_xref(name:"URL", value:"https://support.apple.com/en-us/HT208315");

  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2017 Greenbone AG");
  script_family("Mac OS X Local Security Checks");
  script_dependencies("gather-package-list.nasl");
  script_mandatory_keys("ssh/login/osx_name", "ssh/login/osx_version", re:"ssh/login/osx_version=^10\.13");
  exit(0);
}

include("version_func.inc");

osName = get_kb_item("ssh/login/osx_name");
if(!osName)
  exit(0);

osVer = get_kb_item("ssh/login/osx_version");
if(!osVer || osVer !~ "^10\.13" || "Mac OS X" >!< osName){
  exit(0);
}

if(osVer == "10.13"){
  VULN = TRUE;
  install = osVer;
}

else if(osVer == "10.13.1")
{
  buildVer = get_kb_item("ssh/login/osx_build");
  if(buildVer)
  {
    ## Based on https://en.wikipedia.org/wiki/MacOS_High_Sierra
    if(version_is_less(version:buildVer, test_version:"17B48")){
      VULN = TRUE;
      install = osVer + ' build ' + buildVer;
    }
  }
}

if(VULN)
{
  report = report_fixed_ver(installed_version:install, fixed_version:"10.13.2");
  security_message(data:report);
  exit(0);
}

exit(99);