Microsoft Security Essentials RCE Vulnerability (Apr 2018)

# 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

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.813117");
  script_version("2025-08-05T05:45:17+0000");
  script_cve_id("CVE-2018-0986");
  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:"2025-08-05 05:45:17 +0000 (Tue, 05 Aug 2025)");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2020-08-24 17:37:00 +0000 (Mon, 24 Aug 2020)");
  script_tag(name:"creation_date", value:"2018-04-04 18:34:03 +0530 (Wed, 04 Apr 2018)");
  script_tag(name:"qod_type", value:"executable_version");
  script_name("Microsoft Security Essentials RCE Vulnerability (Apr 2018)");

  script_tag(name:"summary", value:"This host is missing a critical security
  update according to Microsoft Security Updates released for Microsoft Malware
  Protection Engine (MPE) dated 03-04-2018");

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

  script_tag(name:"insight", value:"The flaw exists when the Microsoft Malware
  Protection Engine (MPE) does not properly scan a specially crafted file, leading to
  memory corruption.");

  script_tag(name:"impact", value:"Successful exploitation will allow an attacker
  to execute arbitrary code in the security context of the LocalSystem account
  and take control of the system. An attacker could then install programs, view,
  change, or delete data, or create new accounts with full user rights.");

  script_tag(name:"affected", value:"Microsoft Security Essentials.");

  script_tag(name:"solution", value:"Run the Windows Update to update the malware
  protection engine to the latest version available. Typically, no action is
  required as the built-in mechanism for the automatic detection and deployment
  of updates will apply the update itself.");

  script_tag(name:"solution_type", value:"VendorFix");
  script_xref(name:"URL", value:"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0986");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/103593");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2018 Greenbone AG");
  script_family("Windows");
  script_dependencies("smb_reg_service_pack.nasl",
  "gb_ms_security_essentials_smb_login_detect.nasl");

  script_require_ports(139, 445);
  script_mandatory_keys("SMB/WindowsVersion", "microsoft/security_essentials/mpe_version");
  exit(0);
}

include("smb_nt.inc");
include("secpod_reg.inc");
include("version_func.inc");

key = "SOFTWARE\Microsoft\Microsoft Antimalware";
if(!registry_key_exists(key:key)){
  exit(0);
}

mpe_version = get_kb_item("microsoft/security_essentials/mpe_version");
if(!mpe_version)
  exit(0);

##Last version of the Microsoft Malware Protection Engine affected by this vulnerability Version 1.1.14600.4
##First version of the Microsoft Malware Protection Engine with this vulnerability addressed 1.1.14700.5
if(version_is_less(version:mpe_version, test_version:"1.1.14700.5"))
{
  report = report_fixed_ver(installed_version:mpe_version, fixed_version: "1.1.14700.5 or higher");
  security_message(data:report);
  exit(0);
}
exit(0);