Microsoft Silverlight Multiple Remote Code Execution Vulnerabilities (KB4023307)

# 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

CPE = "cpe:/a:microsoft:silverlight";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.810909");
  script_version("2026-04-28T06:28:06+0000");
  script_cve_id("CVE-2017-0283", "CVE-2017-8527");
  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:"2026-04-28 06:28:06 +0000 (Tue, 28 Apr 2026)");
  script_tag(name:"severity_vector", value:"CVSS:3.0/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:"2019-10-03 00:03:00 +0000 (Thu, 03 Oct 2019)");
  script_tag(name:"creation_date", value:"2017-06-14 09:21:37 +0530 (Wed, 14 Jun 2017)");
  script_name("Microsoft Silverlight Multiple Remote Code Execution Vulnerabilities (KB4023307)");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2017 Greenbone AG");
  script_family("Windows : Microsoft Bulletins");
  script_dependencies("gb_ms_silverlight_detect.nasl");
  script_mandatory_keys("Microsoft/Silverlight/Installed");

  script_xref(name:"URL", value:"https://support.microsoft.com/en-us/help/4023307");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/63676");

  script_tag(name:"summary", value:"This host is missing an important security
  update according to Microsoft security update KB4023307.");

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

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

  - The Windows font library improperly handles specially crafted embedded fonts.

  - The way Windows Uniscribe handles objects in memory.");

  script_tag(name:"impact", value:"Successful exploitation allows an attacker
  to take control of the affected 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 Silverlight version 5.");

  script_tag(name:"solution", value:"The vendor has released updates. Please see the references for more information.");

  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"qod_type", value:"registry");

  exit(0);
}

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

if(!msl_ver = get_app_version(cpe:CPE)){
  exit(0);
}

if(msl_ver=~ "^5\.")
{
  if(version_is_less(version:msl_ver, test_version:"5.1.50907.0"))
  {
    report = 'Silverlight version: ' + msl_ver  + '\n' +
             'Vulnerable range:    5.0 - 5.1.50906.0';
    security_message(data:report);
    exit(0);
  }
}