{"id":74621,"date":"2025-09-13T02:59:13","date_gmt":"2025-09-13T02:59:13","guid":{"rendered":""},"modified":"2025-11-02T11:12:42","modified_gmt":"2025-11-02T17:12:42","slug":"cve-2025-59033-critical-vulnerability-in-microsoft-s-driver-block-list","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-59033-critical-vulnerability-in-microsoft-s-driver-block-list\/","title":{"rendered":"<strong>CVE-2025-59033: Critical Vulnerability in Microsoft&#8217;s Driver Block List<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The world of Cybersecurity is once again on high alert due to a new vulnerability, CVE-2025-59033, discovered within Microsoft&#8217;s driver block list. This vulnerability exposes systems without hypervisor-protected code integrity (HVCI) to potential breaches, mainly affecting Windows 10, Windows 11 and Windows Server 2016 and subsequent versions. The severity of this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2022-45134-critical-vulnerability-in-mahara-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"82866\">vulnerability becomes apparent when we consider its potential for system<\/a> compromise or data leakage, making it a high-priority issue for any organization using affected systems.<br \/>\nThe <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-29514-high-severity-access-control-vulnerability-in-d-link-dsl-7740c-router\/\"  data-wpil-monitor-id=\"83187\">vulnerability lies within the Windows Defender Application Control<\/a> (WDAC) policy implementation. It&#8217;s crucial to understand the implication of this vulnerability, considering WDAC is widely used for controlling which applications and <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-8913-critical-local-file-inclusion-vulnerability-in-wellchoose-s-organization-portal-system\/\"  data-wpil-monitor-id=\"82419\">files are allowed or blocked in an organization&#8217;s<\/a> Windows environment. This vulnerability, therefore, poses a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-54887-significant-security-vulnerability-in-jwe-ruby-encryption-implementation\/\"  data-wpil-monitor-id=\"82675\">significant risk to business security<\/a> and data integrity.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-59033<br \/>\nSeverity: Critical (9.8 CVSS Score)<br \/>\nAttack Vector: Local Network<br \/>\nPrivileges Required: Admin Rights<br \/>\nUser Interaction: Required<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-9791-critical-vulnerability-in-tenda-ac20-16-03-08-05-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"84966\">Potential for system<\/a> compromise or data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-516666001\" class=\"ameeb-content-2 ameeb-entity-placement\"><div style=\"border-left: 4px solid #555; padding-left: 20px; margin: 48px 0; font-family: Roboto, sans-serif; color: #ffffff; line-height: 1.6; max-width: 700px;\">\r\n  <h2 style=\"margin-top: 0; font-size: 20px; font-weight: 600; display: flex; align-items: center;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"display: inline-flex; align-items: center; margin-right: 8px;\">\r\n      <img decoding=\"async\" src=\"https:\/\/www.ameeba.com\/blog\/wp-content\/uploads\/2025\/10\/Best-App-icon-Ameeba.png\" alt=\"Ameeba Chat Icon\" style=\"width: 40px; height: 40px;\" \/>\r\n    <\/a>\r\n    A new way to communicate\r\n  <\/h2>\r\n\r\n  <p style=\"margin-bottom: 12px;\">\r\n    Ameeba Chat is built on encrypted identity, not personal profiles.\r\n  <\/p>\r\n\r\n  <p style=\"margin-bottom: 16px;\">\r\n    Message, call, share files, and coordinate with identities kept separate.\r\n  <\/p>\r\n\r\n  <ul style=\"list-style: none; padding-left: 0; margin-bottom: 20px;\">\r\n    <li>\u2022 Encrypted identity<\/li>\r\n    <li>\u2022 Ameeba Chat authenticates access<\/li>\r\n    <li>\u2022 Aliases and categories<\/li>\r\n    <li>\u2022 End-to-end encrypted chat, calls, and files<\/li>\r\n    <li>\u2022 Secure notes for sensitive information<\/li>\r\n  <\/ul>\r\n\r\n  <p style=\"font-style: italic; font-weight: 600; margin-bottom: 24px;\">\r\n    Private communication, rethought.\r\n  <\/p>\r\n\r\n  <div style=\"display: flex; flex-wrap: wrap; gap: 12px;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\/download\" style=\"background-color: #ffffff; color: #000000; padding: 10px 20px; text-decoration: none; border-radius: 6px; font-weight: 500;\">Download Ameeba Chat<\/a>\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"border: 1px solid #ffffff; color: #ffffff; padding: 10px 20px; text-decoration: none; border-radius: 6px; font-weight: 500;\">Learn More<\/a>\r\n  <\/div>\r\n<\/div>\r\n<\/div>\n<p>Product | Affected Versions<\/p>\n<p>Windows 10 | All versions without HVCI<br \/>\nWindows 11 | All versions without HVCI<br \/>\nWindows Server | 2016 and later versions without HVCI<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit takes advantage of a flaw in the WDAC policy implementation. On systems that do not have HVCI enabled, entries that specify only the to-be-signed (TBS) part of the code signer certificate are blocked correctly. However, entries that incorporate the signing certificate&#8217;s TBS hash along with a &#8216;FileAttribRef&#8217; qualifier (such as <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-52904-command-execution-vulnerability-in-file-browser-version-2-32-0\/\"  data-wpil-monitor-id=\"92223\">file name or version<\/a>) will not be blocked. This loophole allows potential attackers to bypass the driver blocklist, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-7775-critical-memory-overflow-vulnerability-in-netscaler-adc-and-gateway-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"83774\">potentially leading to a system<\/a> compromise or data leakage.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-1915537603\" class=\"ameeb-content ameeb-entity-placement\"><div class=\"poptin-embedded\" data-id=\"f6b387694f681\"><\/div>\r\n\r\n\r\n\r\n\r\n\r\n<\/div>\n<p>The following pseudocode demonstrates a conceptual exploit for this vulnerability:<\/p>\n<pre><code class=\"\" data-line=\"\">def exploit(target_system):\nmalicious_driver = {\n&#039;tbs_hash&#039;: &#039;...&#039;,\n&#039;FileAttribRef&#039;: {\n&#039;file_name&#039;: &#039;...&#039;,\n&#039;version&#039;: &#039;...&#039;\n}\n}\nif not target_system.has_hvci_enabled():\nupload_driver(target_system, malicious_driver)\ntarget_system.install_driver(malicious_driver)\ncompromise_system(target_system)<\/code><\/pre>\n<p>This pseudocode illustrates an attacker creating a malicious driver with a TBS hash and a &#8216;FileAttribRef&#8217; qualifier, then checking if the target system has HVCI enabled. If HVCI is not enabled, the attacker then uploads and installs the malicious driver, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-22404-potential-system-compromise-due-to-use-after-free-vulnerability\/\"  data-wpil-monitor-id=\"85638\">compromising the system<\/a>. This example highlights the potential <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-24775-high-severity-unrestricted-file-upload-vulnerability-in-made-i-t-forms\/\"  data-wpil-monitor-id=\"83069\">severity of this vulnerability<\/a> and the importance of enabling HVCI or applying the vendor&#8217;s patch.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The world of Cybersecurity is once again on high alert due to a new vulnerability, CVE-2025-59033, discovered within Microsoft&#8217;s driver block list. This vulnerability exposes systems without hypervisor-protected code integrity (HVCI) to potential breaches, mainly affecting Windows 10, Windows 11 and Windows Server 2016 and subsequent versions. The severity of this vulnerability becomes apparent [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[82],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-74621","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-microsoft"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/74621","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/comments?post=74621"}],"version-history":[{"count":9,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/74621\/revisions"}],"predecessor-version":[{"id":85437,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/74621\/revisions\/85437"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=74621"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=74621"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=74621"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=74621"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=74621"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=74621"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=74621"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=74621"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=74621"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}