Microsoft Office 2016 RCE Vulnerability (KB5002766)

# SPDX-FileCopyrightText: 2025 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("1.3.6.1.4.1.25623.1.0.836258");
  script_version("2025-09-11T05:38:37+0000");
  script_cve_id("CVE-2025-54906");
  script_tag(name:"cvss_base", value:"7.2");
  script_tag(name:"cvss_base_vector", value:"AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_tag(name:"last_modification", value:"2025-09-11 05:38:37 +0000 (Thu, 11 Sep 2025)");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:L/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:"2025-09-09 17:16:02 +0000 (Tue, 09 Sep 2025)");
  script_tag(name:"creation_date", value:"2025-09-10 06:59:47 +0000 (Wed, 10 Sep 2025)");
  script_name("Microsoft Office 2016 RCE Vulnerability (KB5002766)");

  script_tag(name:"summary", value:"This host is missing an critical security
  update according to Microsoft KB5002766");

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

  script_tag(name:"impact", value:"Successful exploitation allows an attacker
  to conduct remote code execution.");

  script_tag(name:"affected", value:"Microsoft Office 2016.");

  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:"executable_version");
  script_xref(name:"URL", value:"https://support.microsoft.com/en-us/help/5002766");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2025 Greenbone AG");
  script_family("Windows : Microsoft Bulletins");
  script_dependencies("secpod_office_products_version_900032.nasl");
  script_mandatory_keys("MS/Office/Ver");
  script_require_ports(139, 445);
  exit(0);
}

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

officeVer = get_kb_item("MS/Office/Ver");
if(!officeVer) {
  exit(0);
}

if(officeVer =~ "^16\.") {
  os_arch = get_kb_item("SMB/Windows/Arch");
  if("x86" >< os_arch) {
    key_list = make_list("SOFTWARE\Microsoft\Windows\CurrentVersion");
  }
  else if("x64" >< os_arch) {
    key_list =  make_list("SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion",
                          "SOFTWARE\Microsoft\Windows\CurrentVersion");
  }

  foreach key(key_list)
  {
    propath = registry_get_sz(key:key, item:"ProgramFilesDir");
    if(propath) {
      offPath = propath + "\Microsoft Office\root\VFS\ProgramFilesCommonX86\Microsoft Shared\Office16";
      offdllVer = fetch_file_version(sysPath:offPath, file_name:"mso99lwin32client.dll");
      if(!offdllVer || offdllVer !~ "^16\.") {
        exit(0);
      }

      if(version_is_less(version:offdllVer, test_version:"16.0.5513.1000")) {
        report = report_fixed_ver( file_checked:offPath + "\mso99lwin32client.dll",
                                   file_version:offdllVer, vulnerable_range:"Less than 16.0.5513.1000");
        security_message(port:0, data:report);
        exit(0);
      }
    }
  }
}

exit(0);