{"id":37950,"date":"2020-10-30T21:26:11","date_gmt":"2020-10-30T21:26:11","guid":{"rendered":"https:\/\/www.threatshub.org\/blog\/windows-kernel-zero-day-disclosed-by-googles-project-zero-after-bug-exploited-in-the-wild-by-hackers\/"},"modified":"2020-10-30T21:26:11","modified_gmt":"2020-10-30T21:26:11","slug":"windows-kernel-zero-day-disclosed-by-googles-project-zero-after-bug-exploited-in-the-wild-by-hackers","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/windows-kernel-zero-day-disclosed-by-googles-project-zero-after-bug-exploited-in-the-wild-by-hackers\/","title":{"rendered":"Windows kernel zero-day disclosed by Google&#8217;s Project Zero after bug exploited in the wild by hackers"},"content":{"rendered":"<p>Google&#8217;s Project Zero bug-hunting team has disclosed a Windows kernel flaw that&#8217;s being actively exploited by miscreants to gain administrator access on compromised machines.<\/p>\n<p>The web giant&#8217;s <a target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\/\/bugs.chromium.org\/p\/project-zero\/issues\/detail?id=2104\">bug report<\/a> was privately disclosed to Microsoft on October 22, and publicly revealed just seven days later, after it detected persons unknown exploiting the programming blunder. The privilege-escalation issue was identified by Mateusz Jurczyk and Sergei Glazunov of Google Project Zero.<\/p>\n<p>&#8220;The Windows Kernel Cryptography Driver (<code>cng.sys<\/code>) exposes a \\Device\\CNG device to user-mode programs and supports a variety of IOCTLs with non-trivial input structures,&#8221; the bug report explains. &#8220;It constitutes a locally accessible attack surface that can be exploited for privilege escalation (such as sandbox escape).&#8221;<\/p>\n<p>Malware already on a system, or a rogue insider, can potentially exploit this buggy driver to gain admin-level control of a vulnerable Windows box. The flaw, designated as CVE-2020-17087, is the result of improper 16-bit integer truncation that can lead to a buffer overflow.<\/p>\n<div class=\"promo_article\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/regmedia.co.uk\/2019\/11\/12\/reg-demo.png?x=174&amp;y=115&amp;crop=1\" width=\"174\" height=\"115\" alt=\"You can run a web application and connect with localhost for test and debug\"><\/p>\n<h2 title=\"Plus: A warning to SharePoint operators\">First, Patch Tuesday. Now, Oh Hell, Monday: Microsoft emits bonus fixes for Visual Studio, Windows 10 security bugs<\/h2>\n<p><a href=\"https:\/\/www.theregister.com\/2020\/10\/19\/security_in_brief\/\"><span>READ MORE<\/span><\/a><\/div>\n<p>The Google researchers have posted PoC exploit code tested on Windows 10 1903 (64-bit). They say the <code>cng.sys<\/code>flaw looks to have been present since at least Windows 7.<\/p>\n<p>The Project Zero report says that Shane Huntley, director of Google&#8217;s Threat Analysis Group, has confirmed that active exploitation is targeted and &#8220;is not related to any US election-related targeting.&#8221;<\/p>\n<p>A patch is expected by November 10, 2020, which would be the next &#8220;Patch Tuesday&#8221; from Microsoft.<\/p>\n<p>In an emailed statement, a Microsoft spokesperson said the company is working on a fix and characterized the known targeted attack as limited.<\/p>\n<p>&#8220;Microsoft has a customer commitment to investigate reported security issues and update impacted devices to protect customers,&#8221; the spokesperson said.<\/p>\n<p>&#8220;While we work to meet all researchers\u2019 deadlines for disclosures, including short-term deadlines like in this scenario, developing a security update is a balance between timeliness and quality, and our ultimate goal is to help ensure maximum customer protection with minimal customer disruption.&#8221;<\/p>\n<p>However, the Windows giant suggested exploitation would be difficult because an attacker would first need to compromise a host machine and then exploit another vulnerability of the local system. Microsoft says the only known remote-based attack chain for this vulnerability has been dealt with, a hole in Chromium-based browsers (<a target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\/\/twitter.com\/benhawkes\/status\/1318640422571266048\">CVE-2020-15999<\/a>) that was fixed this month. \u00ae<\/p>\n<p> READ MORE <a href=\"https:\/\/go.theregister.com\/feed\/www.theregister.com\/2020\/10\/30\/windows_kernel_zeroday\/\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Chocolate Factory spills beans on make-me-admin flaw Google&#8217;s Project Zero bug-hunting team has disclosed a Windows kernel flaw that&#8217;s being actively exploited by miscreants to gain administrator access on compromised machines.\u2026 READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":37951,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[63],"tags":[],"class_list":["post-37950","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-the-register"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Windows kernel zero-day disclosed by Google&#039;s Project Zero after bug exploited in the wild by hackers 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta name=\"description\" content=\"ThreatsHub Cybersecurity News | ThreatsHub.org | Cloud Security &amp; Cyber Threats Analysis Hub. 100% Free OSINT Threat Intelligent and Cybersecurity News.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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