KB5094125: Windows Server 2025 Security Update (June 2026)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.

#
# The descriptive text and package checks in this plugin were
# extracted from the Microsoft Security Updates API. The text
# itself is copyright (C) Microsoft Corporation.
##

include('compat.inc');

if (description)
{
  script_id(320186);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/23");

  script_cve_id(
    "CVE-2020-17103",
    "CVE-2026-8863",
    "CVE-2026-33828",
    "CVE-2026-34335",
    "CVE-2026-40404",
    "CVE-2026-40409",
    "CVE-2026-41092",
    "CVE-2026-41108",
    "CVE-2026-42828",
    "CVE-2026-42836",
    "CVE-2026-42837",
    "CVE-2026-42903",
    "CVE-2026-42904",
    "CVE-2026-42905",
    "CVE-2026-42906",
    "CVE-2026-42907",
    "CVE-2026-42908",
    "CVE-2026-42909",
    "CVE-2026-42910",
    "CVE-2026-42911",
    "CVE-2026-42912",
    "CVE-2026-42913",
    "CVE-2026-42914",
    "CVE-2026-42915",
    "CVE-2026-42916",
    "CVE-2026-42968",
    "CVE-2026-42969",
    "CVE-2026-42970",
    "CVE-2026-42971",
    "CVE-2026-42972",
    "CVE-2026-42973",
    "CVE-2026-42974",
    "CVE-2026-42977",
    "CVE-2026-42978",
    "CVE-2026-42979",
    "CVE-2026-42980",
    "CVE-2026-42981",
    "CVE-2026-42983",
    "CVE-2026-42984",
    "CVE-2026-42985",
    "CVE-2026-42986",
    "CVE-2026-42987",
    "CVE-2026-42989",
    "CVE-2026-42991",
    "CVE-2026-42992",
    "CVE-2026-42993",
    "CVE-2026-44799",
    "CVE-2026-44801",
    "CVE-2026-44802",
    "CVE-2026-44803",
    "CVE-2026-44805",
    "CVE-2026-44809",
    "CVE-2026-44810",
    "CVE-2026-44812",
    "CVE-2026-44815",
    "CVE-2026-45487",
    "CVE-2026-45585",
    "CVE-2026-45586",
    "CVE-2026-45588",
    "CVE-2026-45592",
    "CVE-2026-45593",
    "CVE-2026-45594",
    "CVE-2026-45595",
    "CVE-2026-45596",
    "CVE-2026-45597",
    "CVE-2026-45598",
    "CVE-2026-45599",
    "CVE-2026-45600",
    "CVE-2026-45601",
    "CVE-2026-45602",
    "CVE-2026-45603",
    "CVE-2026-45604",
    "CVE-2026-45605",
    "CVE-2026-45606",
    "CVE-2026-45607",
    "CVE-2026-45608",
    "CVE-2026-45634",
    "CVE-2026-45635",
    "CVE-2026-45636",
    "CVE-2026-45637",
    "CVE-2026-45638",
    "CVE-2026-45639",
    "CVE-2026-45640",
    "CVE-2026-45641",
    "CVE-2026-45642",
    "CVE-2026-45648",
    "CVE-2026-45653",
    "CVE-2026-45654",
    "CVE-2026-45655",
    "CVE-2026-45656",
    "CVE-2026-45657",
    "CVE-2026-45658",
    "CVE-2026-47288",
    "CVE-2026-47289",
    "CVE-2026-47291",
    "CVE-2026-47648",
    "CVE-2026-47652",
    "CVE-2026-47653",
    "CVE-2026-47654",
    "CVE-2026-47656",
    "CVE-2026-48563",
    "CVE-2026-48568",
    "CVE-2026-48570",
    "CVE-2026-48573",
    "CVE-2026-48574",
    "CVE-2026-48575",
    "CVE-2026-48576",
    "CVE-2026-48578",
    "CVE-2026-48583",
    "CVE-2026-49160"
  );
  script_xref(name:"MSKB", value:"5094125");
  script_xref(name:"MSFT", value:"MS26-5094125");
  script_xref(name:"IAVA", value:"2026-A-0568");
  script_xref(name:"IAVA", value:"2026-A-0569");

  script_name(english:"KB5094125: Windows Server 2025 Security Update (June 2026)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Windows host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The remote Windows host is missing security update 5094125. It is, therefore, affected by multiple vulnerabilities

  - Integer overflow or wraparound in Windows HTTP.sys allows an unauthorized attacker to execute code over a
    network. (CVE-2026-47291)

  - Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a
    network. (CVE-2026-42909, CVE-2026-42913, CVE-2026-42985, CVE-2026-42992, CVE-2026-42993, CVE-2026-44799,
    CVE-2026-44801, CVE-2026-47289, CVE-2026-47653, CVE-2026-47654, CVE-2026-48563)

  - Heap-based buffer overflow in Microsoft Windows DNS allows an authorized attacker to elevate privileges
    locally. (CVE-2026-41108)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5094125");
  script_set_attribute(attribute:"solution", value:
"Apply Security Update 5094125");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:H/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-47653");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-45641");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploited_by_malware", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/06/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/09");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:microsoft:windows_server_2025");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Windows : Microsoft Bulletins");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("smb_check_rollup.nasl", "smb_hotfixes.nasl", "ms_bulletin_checks_possible.nasl");
  script_require_keys("SMB/MS_Bulletin_Checks/Possible");
  script_require_ports(139, 445, "Host/patch_management_checks");

  exit(0);
}

include('smb_func.inc');
include('smb_hotfixes.inc');
include('smb_hotfixes_fcheck.inc');
include('smb_reg_query.inc');

get_kb_item_or_exit('SMB/MS_Bulletin_Checks/Possible');

var bulletin = 'MS26-06';
var kbs = make_list(
  '5094125'
);

if (get_kb_item('Host/patch_management_checks')) hotfix_check_3rd_party(bulletin:bulletin, kbs:kbs, severity:SECURITY_HOLE);

get_kb_item_or_exit('SMB/Registry/Enumerated');
get_kb_item_or_exit('SMB/WindowsVersion', exit_code:1);

if (hotfix_check_sp_range(win10:'0') <= 0) audit(AUDIT_OS_SP_NOT_VULN);

var share = hotfix_get_systemdrive(as_share:TRUE, exit_on_fail:TRUE);
if (!is_accessible_share(share:share)) audit(AUDIT_SHARE_FAIL, share);

# This plugin is for Windows Server 2025 only (version 4th component >= 32000)
# Windows 11 24H2/25H2 systems (< 32000) should use the KB5094126 plugin instead
var os_build = get_kb_item('SMB/WindowsVersionBuild');
var os_name = get_kb_item("SMB/ProductName");
if (os_build == '26100')
{
  var systemroot = hotfix_get_systemroot();
  var path = hotfix_append_path(path:systemroot + "\system32", value:"ntoskrnl.exe");
  var fver = hotfix_get_fversion(path:path);
  if (!isnull(fver) && fver['error'] == HCF_OK && !isnull(fver['version']))
  {
    var ver_parts = split(fver['version'], sep:'.', keep:FALSE);
    if ((max_index(ver_parts) >= 4 && int(ver_parts[3]) < 32000) && ('server' >!< tolower(os_name)))
    {
      # Windows 11 24H2/25H2 system - this plugin doesn't apply (use KB5094126)
      hotfix_check_fversion_end();
      audit(AUDIT_HOST_NOT, 'affected (Windows 11 - use KB5094126)');
    }
  }
}

if (
  smb_check_rollup(os:'10',
                   os_build:26100,
                   rollup_date:'06_2026',
                   bulletin:bulletin,
                   rollup_kb_list:[5094125])
)
{
  replace_kb_item(name:'SMB/Missing/'+bulletin, value:TRUE);
  hotfix_security_hole();
  hotfix_check_fversion_end();
  exit(0);
}
else
{
  hotfix_check_fversion_end();
  audit(AUDIT_HOST_NOT, hotfix_get_audit_report());
}