{"id":3550,"date":"2026-05-08T10:11:53","date_gmt":"2026-05-08T10:11:53","guid":{"rendered":"https:\/\/im-cybersec.com\/?p=3550"},"modified":"2026-05-08T10:13:00","modified_gmt":"2026-05-08T10:13:00","slug":"prepared-for-the-expiration-of-the-secure-boot-windows-uefi-2011-ca","status":"publish","type":"post","link":"https:\/\/im-cybersec.com\/de\/prepared-for-the-expiration-of-the-secure-boot-windows-uefi-2011-ca\/","title":{"rendered":"Sind Sie vorbereitet f\u00fcr den Ablauf der Windows Secure Boot UEFI 2011 CA?\u00a0"},"content":{"rendered":"

Viele Systemadministratoren haben es vielleicht noch nicht auf dem Schirm, dass in K\u00fcrze die Certificate Authority (CA), mit dem der Windows Secure Boot Loader und die Secure Boot Datenbanken signiert sind, abl\u00e4uft und durch eine neue ersetzt werden muss. Im Netz kursieren viele Informationen zu diesem Thema, aber zumeist nur Teilst\u00fccke. Daher m\u00f6chten wir dieses Thema ganzheitlich aus der Sicht eines Systemadministrators betrachten.\u00a0<\/p>\n\n\n\n

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Windows UEFI Secure Boot verwendet 4 Datenbanken:\u00a0<\/strong><\/strong><\/h2><\/div>\n\n\n\n
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- KEK (key enrollement key): Die darin gespeicherte CA wird verwendet, um Aktualisierungen der Active DB und DBX zu signieren. Die hierin gespeicherte Microsoft CA von 2011 l\u00e4uft im Juni 2026 ab. Nach Ablauf der CA k\u00f6nnen in der DB und DBX keine \u00c4nderungen mehr signiert werden.\u00a0
- Default DB: Viele Markenhersteller aktualisieren die darin enthaltene CA mit der Microsoft 2023 CA. Jedoch wird diese Default DB nicht beim Booten verwendet, es sei denn man setzt das BIOS auf Factory Default zur\u00fcck.\u00a0
- Active DB (Secure Boot Signature Database): Hier sitzt die CA, die f\u00fcr den Secure Boot verwendet wird. Die Microsoft 2011 CA f\u00fcr den Windows Bootloader l\u00e4uft im Oktober 2026, die f\u00fcr 3rd-Party Bootloader im Juni 2026 ab.\u00a0\u00a0
- DBX (Secure Boot Revoked Signature Database): Zur\u00fcckgerufene Zertifikate\/Bootloader\u00a0<\/p>\n\n\n\n

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Was passiert, wenn die CA abgelaufen ist?\u00a0<\/h2><\/div>\n\n\n\n
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Laut Microsoft funktioniert der Secure Boot der bestehenden Windows Installationen nach wie vor. Jedoch k\u00f6nnen keine \u00c4nderungen der Secure Boot Konfiguration vorgenommen werden und der Store f\u00fcr zur\u00fcckgerufenen Bootloader wird nicht mehr aktualisert. Dies ist ein Sicherheitsrisiko.\u00a0

F\u00fcr Systemadministratoren bedeutet das aber auch, dass Deployment Tools, die zum Beispiel PXE-Boot oder USB-Boot verwenden, nicht mehr funktionieren, da die alte CA abgelaufen ist und die neue CA nicht akzeptiert wird.\u00a0<\/p>\n\n\n\n

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Warum passiert das Update der CA nicht automatisch?\u00a0<\/strong><\/strong><\/h2><\/div>\n\n\n\n
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Im Prinzip kann es automatisch passieren, aber in der Realit\u00e4t muss man doch eingreifen. Die Default DB wird zwar \u00fcber BIOS Updates aktualisiert, sofern der Hersteller f\u00fcr das Modell noch BIOS Updates liefert. Ma\u00dfgeblich ist allerdings die Active DB. Diese soll zwar durch Windows Update die neue UEFI 2023 CA bekommen, aber in der Standardeinstellung ist dies deaktiviert. Im Windows Aufgabenplanner ist ein Task konfiguriert, der alle 12 Stunden l\u00e4uft und die UEFI 2023 CA in KEK und Active DB schreiben soll. Dies kann er aber zumeist nicht, weil eine Einstellung in der Registry dies blockiert. Daher kommen im Windows System Log die Fehlermeldungen 1801 von TPM-WMI.\u00a0<\/p>\n\n\n\n

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Wie kann ich nun die UEFI 2023 CA ausrollen?\u00a0<\/strong><\/strong><\/h2><\/div>\n\n\n\n
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Laut unseren Informationen muss Secure Boot daf\u00fcr eingeschaltet sein.\u00a0

Microsoft hat eine administrative Vorlage in den Grruppenrichtlinien-Vorlagen von Windows 11 25H2 (v2) daf\u00fcr vorgesehen. Die Bezeichnung der 3 vorhandenen Vorlagen f\u00fcr Secure Boot ist allerdings missverst\u00e4ndlich, daher sollte man sich genau informieren, welche davon man aktiviert. Meistens wird man \"Enable Secure Boot Certificate Deployment\" aktivieren.\u00a0

Einmal angewendet, kann der Hintergrundjob im Aufgabenplaner das Zertifikat in KEK und Active DB schreiben und nach 2 Reboots ist die Sache erledigt.\u00a0\u00a0

Es empfiehlt sich jedoch, den Vorgang und den Status zu \u00fcberwachen. Mit 2 einfachen Inventarregeln in KACE oder Action1 kann man auslesen, ob das Deployment tats\u00e4chlich aktiviert ist und wie der Status der UEFI2023CA ist (NotStarted, InProgress oder Updated).\u00a0

Die Gruppenrichtline erlaubt zwar das Update der CA, aber erst mit den Inventarregeln und zugeh\u00f6rigen Berichten bekommt man den \u00dcberblick, welche Ger\u00e4te sicher sind und wo h\u00e4ndisch eingegriffen werden muss.\u00a0<\/p>\n\n\n\n

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Ben\u00f6tigen Sie Unterst\u00fctzung beim Rollout des Windows Secure Boot CA?<\/strong><\/h2><\/div>\n<\/div><\/div>\n\n\n\n
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Wenn Sie unsicher sind, ob Ihre Umgebung bereits auf das bevorstehende Ablaufdatum der Secure-Boot-Zertifizierungsstelle vorbereitet ist, oder wenn Sie Betriebsunterbrechungen und Sicherheitsl\u00fccken vermeiden m\u00f6chten, stehen wir Ihnen gerne zur Seite. Wir unterst\u00fctzen Sie bei der Planung und Durchf\u00fchrung des UEFI-2023-CA-Rollouts, bei der Konfiguration der erforderlichen Gruppenrichtlinien sowie bei der Validierung, dass die Bereitstellung erfolgreich auf allen Endger\u00e4ten umgesetzt wurde. Dar\u00fcber hinaus helfen wir Ihnen beim Aufbau eines geeigneten Monitorings und Reportings, sodass Sie jederzeit einen klaren \u00dcberblick dar\u00fcber haben, welche Ger\u00e4te konform sind und wo noch manuelle Ma\u00dfnahmen erforderlich sind. Kontaktieren Sie uns f\u00fcr eine Beratung und stellen Sie sicher, dass Ihre Infrastruktur sicher und zukunftsf\u00e4hig bleibt \u2013 ohne unn\u00f6tige Risiken oder kurzfristigen Handlungsdruck.<\/p>\n\n\n\n

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Buchen Sie einen Anruf<\/div><\/a><\/div><\/div>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"

Many system administrators may not yet be aware that the Certificate Authority (CA) used to sign the Windows Secure Boot\u00a0Loader\u00a0and the Secure Boot databases is set to expire shortly and must be replaced with a new one. There is a lot of information circulating online about this topic, but most of it is incomplete. Therefore, […]<\/p>","protected":false},"author":1,"featured_media":3551,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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system administrators may not yet be aware that the Certificate Authority (CA) used to sign the Windows Secure Boot\u00a0Loader\u00a0and the Secure Boot databases is set to expire shortly and must be replaced with a new one. There is a lot of information circulating online about this topic, but most of it is incomplete. 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