{"id":57831,"date":"2024-12-06T23:48:17","date_gmt":"2024-12-06T23:48:17","guid":{"rendered":"https:\/\/www.threatshub.org\/blog\/micropatchers-share-1-instruction-fix-for-ntlm-hash-leak-flaw-in-windows-7\/"},"modified":"2024-12-06T23:48:17","modified_gmt":"2024-12-06T23:48:17","slug":"micropatchers-share-1-instruction-fix-for-ntlm-hash-leak-flaw-in-windows-7","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/micropatchers-share-1-instruction-fix-for-ntlm-hash-leak-flaw-in-windows-7\/","title":{"rendered":"Micropatchers share 1-instruction fix for NTLM hash leak flaw in Windows 7+"},"content":{"rendered":"<p>Acros Security claims to have found an unpatched bug in Microsoft Windows 7 and onward that can be exploited to steal users&#8217; OS account credentials.<\/p>\n<p>The flaw-finding biz \u2013 which develops and releases unofficial &#8220;micropatches&#8221; to close holes in software that vendors won&#8217;t address \u2013 says this particular bug is an NTLM vulnerability.<\/p>\n<p>We&#8217;re told victims who view a maliciously crafted file in vulnerable versions of Windows Explorer may have their NTLM hash leaked, presumably to a remote miscreant via the network. Exact details of how this bug can exploited have understandably not yet been disclosed; we&#8217;re not aware of it being under attack yet, either.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"condor\" data-xsm=\",fluid,mpu,\" data-sm=\",fluid,mpu,\" data-md=\",fluid,mpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/patches&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2Z1OvDolS8HM4nGsYEjb4XQAAAMk&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/patches&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2Z1OvDolS8HM4nGsYEjb4XQAAAMk&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>For those interested, how this type of bug manifests in Windows and how this class of flaw is exploited in general was explained <a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/blog.morphisec.com\/5-ntlm-vulnerabilities-unpatched-privilege-escalation-threats-in-microsoft\">neatly here<\/a> late last month by Morphisec with examples. Leaked NTLM credential hashes can be used to authenticate as users or cracked to reveal their plaintext passwords, potentially.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"falcon\" data-xmd=\",fluid,mpu,leaderboard,\" data-lg=\",fluid,mpu,leaderboard,\" data-xlg=\",fluid,billboard,superleaderboard,mpu,leaderboard,\" data-xxlg=\",fluid,billboard,superleaderboard,brandwidth,brandimpact,leaderboard,mpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/patches&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44Z1OvDolS8HM4nGsYEjb4XQAAAMk&amp;t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/patches&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44Z1OvDolS8HM4nGsYEjb4XQAAAMk&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<div class=\"adun_eagle_desktop_story_wrapper\">\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"mid\" data-raptor=\"eagle\" data-xxlg=\",mpu,dmpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/patches&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33Z1OvDolS8HM4nGsYEjb4XQAAAMk&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/patches&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33Z1OvDolS8HM4nGsYEjb4XQAAAMk&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<\/p><\/div>\n<p>According to Acros on Thursday, this latest flaw affects all systems from Windows 7 and Server 2008 R2 to the latest Windows 11 v24H2 and Server 2022.<\/p>\n<p>&#8220;The vulnerability allows an attacker to obtain user&#8217;s NTLM credentials by simply having the user view a malicious file in Windows Explorer &#8211; eg, by opening a shared folder or USB disk with such file, or viewing the Downloads folder where such file was previously automatically downloaded from attacker&#8217;s web page,&#8221; <a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/blog.0patch.com\/2024\/12\/url-file-ntlm-hash-disclosure.html\">said<\/a> CEO Mitja Kolsek.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"falcon\" data-xsm=\",fluid,mpu,\" data-sm=\",fluid,mpu,\" data-md=\",fluid,mpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/patches&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44Z1OvDolS8HM4nGsYEjb4XQAAAMk&amp;t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/patches&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44Z1OvDolS8HM4nGsYEjb4XQAAAMk&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>Acros, which says it has contacted Microsoft about the bug, will be issuing a one-processor-instruction binary micropatch to fix the problem, which will be free until Redmond releases an official fix. Until then, as we said, it&#8217;s keeping quiet about the details. The Windows slinger had no comment at the time of going to press.<\/p>\n<p>It could be that Microsoft thinks the issue isn&#8217;t serious enough to fix. Acros has reported several zero-days to the tech giant in the past, including a <a target=\"_blank\" href=\"https:\/\/www.theregister.com\/2024\/10\/30\/zeroday_windows_themes\/\" rel=\"noopener\">similar NTLM-related issue<\/a> with Windows Themes in October and a <a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/blog.0patch.com\/2024\/11\/windows-server-2012-mark-of-web.html\">Mark of the Web<\/a> problem in Server 2012 products in the following month.<\/p>\n<p>Micropatching is an interesting industry. It caters to organizations that want more than short-term mitigations, and wish to address the root cause of a security flaw, with or without an official update from a supplier. A micropatch that overwrites a few instructions at the heart of a bug to shut down the risk may be just the ticket, provided it&#8217;s gone through sufficient testing by the client as well as the micropatch issuer.<\/p>\n<p>As miracle as they may sound, micropatches have been known to cause their own problems. But with less than a year to go before Windows 10 is retired and sent to a beautiful bit barn in the country where it can roam freely, some IT managers looking to keep the OS safe may resort to micropatches in future.<\/p>\n<p>Microsoft will, of course, be happy to sell you extended support for Windows 10. Previously this was not available to normal folk, but <a target=\"_blank\" href=\"https:\/\/www.theregister.com\/2024\/10\/31\/microsoft_windows_10_support\/\" rel=\"noopener\">that changed<\/a> in October when Microsoft introduced a single-year option for $30. Enterprise users will initially pay $61 per device, rising to $244 by year three. Education buyers get a break, with the package costing a total of $7 for three years of support.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" id=\"story_eagle_xsm_sm_md_xmd_lg_xlg\" data-pos=\"mid\" data-raptor=\"eagle\" data-xsm=\",mpu,dmpu,\" data-sm=\",mpu,dmpu,\" data-md=\",mpu,dmpu,\" data-xmd=\",mpu,dmpu,\" data-lg=\",mpu,dmpu,\" data-xlg=\",mpu,dmpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/patches&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33Z1OvDolS8HM4nGsYEjb4XQAAAMk&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/patches&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33Z1OvDolS8HM4nGsYEjb4XQAAAMk&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>As for Windows 7, mainstream support ended in 2015, extended support in 2020, and support for some embedded uses in 2021. \u00ae<\/p>\n<p> READ MORE <a href=\"https:\/\/go.theregister.com\/feed\/www.theregister.com\/2024\/12\/06\/opatch_zeroday_microsoft\/\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Microsoft&#8217;s OS sure loves throwing your creds at remote systems Acros Security claims to have found an unpatched bug in Microsoft Windows 7 and onward that can be exploited to steal users&#8217; OS account credentials.\u2026 READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[63],"tags":[],"class_list":["post-57831","post","type-post","status-publish","format-standard","hentry","category-the-register"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Micropatchers share 1-instruction fix for NTLM hash leak flaw in Windows 7+ 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, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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