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patches\u003C/a>\u003C/strong>\u003C/p>",[474,475],{"id":286,"title":287},{"id":283,"title":284},{"id":477,"title":478,"description":479,"plans":480},"MJlLPyxqTcy9ys2UaZYNKQ","Windows 10 v1909 patches","\u003Cp>Windows 10 1909 post-end-of-support patches\u003C/p>\n\u003Cp>\u003Cstrong>\u003Ca href=\"/patches?product=Windows+10\" target=\"_blank\" rel=\"noopener\">Click to see the full list of our Windows 10 patches\u003C/a>\u003C/strong>\u003C/p>",[481,482],{"id":283,"title":284},{"id":286,"title":287},{"id":484,"title":485,"description":486,"plans":487},"GscjCa1TQOe5p5Or7g2qyw","Windows 10 v1809 patches","\u003Cp>Windows 10 1809 post-end-of-support patches\u003C/p>\n\u003Cp>\u003Cstrong>\u003Ca href=\"/patches?product=Windows+10\" target=\"_blank\" rel=\"noopener\">Click to see the full list of our Windows 10 patches\u003C/a>\u003C/strong>\u003C/p>",[488,489],{"id":283,"title":284},{"id":286,"title":287},{"id":491,"title":492,"description":493,"plans":494},"OeQ8xMmJTmadIiPcKYkhvw","Windows 10 v1803 patches","\u003Cp>Windows 10 1803 post-end-of-support patches\u003C/p>\n\u003Cp>\u003Cstrong>\u003Ca href=\"/patches?product=Windows+10\" target=\"_blank\" rel=\"noopener\">Click to see the full list of our Windows 10 patches\u003C/a>\u003C/strong>\u003C/p>",[495,496],{"id":283,"title":284},{"id":286,"title":287},{"id":498,"title":499,"description":500,"plans":501},"Obe8z8snRYGoLT6BZyzhZw","Windows 7 post-EOS and post-ESU patches","\u003Cp>Windows 7 post-end-of-support patches, for computers without Extended Security Updates (ESU), or computers with any full year of ESU updates installed\u003C/p>",[502,503],{"id":283,"title":284},{"id":286,"title":287},"Windows Patches","DXze3dvpTu-HF132vKjSug","microsoft-windows-xp",{"alt":508,"url":509,"width":510,"height":510,"responsiveImage":511},"Windows 11 logo","https://www.datocms-assets.com/166020/1764600963-win11.png",300,{"srcSet":512,"webpSrcSet":513,"sizes":514,"src":515,"width":516,"height":516,"aspectRatio":210,"alt":508,"title":18,"bgColor":517,"base64":518},"https://www.datocms-assets.com/166020/1764600963-win11.png?auto=compress&crop=focalpoint&fit=crop&h=40 40w,https://www.datocms-assets.com/166020/1764600963-win11.png?auto=compress&crop=focalpoint&dpr=1.5&fit=crop&h=40 60w,https://www.datocms-assets.com/166020/1764600963-win11.png?auto=compress&crop=focalpoint&dpr=2&fit=crop&h=40 80w,https://www.datocms-assets.com/166020/1764600963-win11.png?auto=compress&crop=focalpoint&dpr=3&fit=crop&h=40 120w,https://www.datocms-assets.com/166020/1764600963-win11.png?auto=compress&crop=focalpoint&dpr=4&fit=crop&h=40 160w","https://www.datocms-assets.com/166020/1764600963-win11.png?auto=compress&crop=focalpoint&fit=crop&fm=webp&h=40 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Server 2012 R2 post-EOS patches","\u003Cp>Windows Server 2012 R2 post-end-of-support patches, for computers without Extended Security Updates (ESU), or computers with any full year of ESU updates installed\u003C/p>\n\u003Cp>\u003Cstrong>\u003Ca href=\"/patches?product=Windows+Server+2012+R2\" target=\"_blank\" rel=\"noopener\">Click to see the full list of our Windows Server 2012 R2 patches\u003C/a>\u003C/strong>\u003C/p>",[529,530],{"id":283,"title":284},{"id":286,"title":287},{"id":532,"title":533,"description":534,"plans":535},"ZaeezXKkT3KGln5CQ4NH9w","Windows Server 2012 post-EOS patches","\u003Cp>Windows Server 2012 post-end-of-support patches, for computers without Extended Security Updates (ESU), or computers with any full year of ESU updates installed\u003C/p>\n\u003Cp>\u003Cstrong>\u003Ca href=\"/patches?product=Windows+Server+2012\" target=\"_blank\" rel=\"noopener\">Click to see the full list of our Windows Server 2012 patches\u003C/a>\u003C/strong>\u003C/p>",[536,537],{"id":283,"title":284},{"id":286,"title":287},{"id":539,"title":540,"description":541,"plans":542},"RYxw9xwXR3-OWnsdr8dFEg","Windows Server 2008 R2 post-EOS and post-ESU patches","\u003Cp>Windows Server 2008 R2 post-end-of-support patches, for computers without Extended Security Updates (ESU), or computers with any full year of ESU updates installed\u003C/p>\n\u003Cp>\u003Cstrong>\u003Ca href=\"/patches?product=Windows+Server+2008+R2\" target=\"_blank\" rel=\"noopener\">Click to see the full list of our Windows Server 2008 R2 patches\u003C/a>\u003C/strong>\u003C/p>",[543,544],{"id":283,"title":284},{"id":286,"title":287},"Windows Server Patches","J7WLPCrKS7i7B8sAyJpKWg","microsoft-windows-vista",{"alt":549,"url":550,"width":551,"height":510,"responsiveImage":552},"Windows Server 2012-2022 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Office 2019 post-EOS patches","\u003Cp>Microsoft Office 2019 post-end-of-support patches\u003C/p>\n\u003Cp>\u003Cstrong>\u003Ca href=\"/patches?product=Office+2019\" target=\"_blank\" rel=\"noopener\">Click to see the full list of our Microsoft Office 2019 patches\u003C/a>\u003C/strong>\u003C/p>",[570,571],{"id":283,"title":284},{"id":286,"title":287},{"id":573,"title":574,"description":575,"plans":576},"MkFk40IJQhCcXnIO2ZDd4Q","Microsoft Office 2016 post-EOS patches","\u003Cp>Microsoft Office 2016 post-end-of-support patches\u003C/p>\n\u003Cp>\u003Cstrong>\u003Ca href=\"/patches?product=Office+2016\" target=\"_blank\" rel=\"noopener\">Click to see the full list of our Microsoft Office 2016 patches\u003C/a>\u003C/strong>\u003C/p>",[577,578],{"id":283,"title":284},{"id":286,"title":287},{"id":580,"title":581,"description":582,"plans":583},"FFqWfGxfQF2q0uyjyRjVWg","Microsoft Office 2013 post-EOS patches","\u003Cp>Microsoft Office 2013 post-end-of-support patches\u003C/p>\n\u003Cp>\u003Cstrong>\u003Ca href=\"/patches?product=Office+2013\" target=\"_blank\" rel=\"noopener\">Click to see the full list of our Microsoft Office 2013 patches\u003C/a>\u003C/strong>\u003C/p>",[584,585],{"id":283,"title":284},{"id":286,"title":287},{"id":587,"title":588,"description":589,"plans":590},"XFYgrsOyRpeuEXk29M4z9g","Microsoft Office 2010 post-EOS patches","\u003Cp>Microsoft Office 2010 post-end-of-support patches\u003C/p>\n\u003Cp>\u003Cstrong>\u003Ca href=\"/patches?product=Office+2010\" target=\"_blank\" rel=\"noopener\">Click to see the full list of our Microsoft Office 2010 patches\u003C/a>\u003C/strong>\u003C/p>",[591,592],{"id":283,"title":284},{"id":286,"title":287},"Microsoft Office Patches","VH2unwR4RjycDA1o_6eSFw","microsoft-windows-7",{"alt":597,"url":598,"width":510,"height":510,"responsiveImage":599},"Microsoft Office 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products patches","\u003Cp>We occasionally patch other Windows products, for instance when a critical vulnerability becomes known and the vendor does not provide an official patch in a timely manner\u003C/p>",[613],{"id":283,"title":284},"Other","BrWA-hAsQYSROgTvF-1ecA","microsoft-windows-11",{"alt":618,"url":619,"width":620,"height":621,"responsiveImage":18},"Windows 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more",[688,691],{"id":689,"primary":685,"externalLink":95,"parent":18,"reference":18,"title":690,"description":40,"publishTranslation":42},"B1pEweRaRD2YBkP6aH1CfA","Help center",{"id":692,"primary":42,"externalLink":693,"parent":18,"reference":18,"title":694,"description":40,"publishTranslation":42},"Mk0Yz-yqTk2akShgf7ARNg","https://central.0patch.com/","Sign in",[696,700],{"id":697,"title":698,"url":699},"NDrk5d4kQ96J2aCuTr-gvg","0patch on X","https://twitter.com/0patch",{"id":701,"title":702,"url":703},"GqN4lYxyTMyzcmRllVY4mg","Linked In","https://linkedin.com/company/0patch",{"left":705,"top":705,"width":706,"height":706,"rotate":705,"vFlip":685,"hFlip":685,"body":707},0,24,"\u003Cg fill=\"none\">\u003Cpath d=\"M11.9999 15.0539L6.34619 9.40013L7.39994 8.34637L11.9999 12.9464L16.5999 8.34637L17.6537 9.40013L11.9999 15.0539Z\" fill=\"currentColor\"/>\u003C/g>",{"left":705,"top":705,"width":706,"height":706,"rotate":705,"vFlip":685,"hFlip":685,"body":709},"\u003Cg 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website.",{"tag":722,"attributes":733,"content":18},{"property":734,"content":731},"og:description",{"tag":722,"attributes":736,"content":18},{"name":737,"content":731},"twitter:description",{"tag":722,"attributes":739,"content":18},{"property":740,"content":741},"og:image","https://www.datocms-assets.com/166020/1774002325-7813_vulncard.png?auto=format&fit=max&w=1200",{"tag":722,"attributes":743,"content":18},{"property":744,"content":745},"og:image:width","1200",{"tag":722,"attributes":747,"content":18},{"property":748,"content":749},"og:image:height","600",{"tag":722,"attributes":751,"content":18},{"property":752,"content":753},"og:image:alt","CVE-2023-21771",{"tag":722,"attributes":755,"content":18},{"name":756,"content":741},"twitter:image",{"tag":722,"attributes":758,"content":18},{"name":759,"content":753},"twitter:image:alt",{"tag":722,"attributes":761,"content":18},{"property":762,"content":32},"og:locale",{"tag":722,"attributes":764,"content":18},{"property":765,"content":77},"og:type",{"tag":722,"attributes":767,"content":18},{"property":768,"content":6},"og:site_name",{"tag":722,"attributes":770,"content":18},{"property":771,"content":772},"article:modified_time","2026-04-01T14:56:10Z",{"tag":722,"attributes":774,"content":18},{"property":775,"content":40},"article:publisher",{"tag":722,"attributes":777,"content":18},{"name":778,"content":779},"twitter:card","summary",{"tag":722,"attributes":781,"content":18},{"name":782,"content":783},"robots","noindex",[785],{"value":786,"locale":32},"micropatches-for-windows-local-session",[788],{"value":42,"locale":32},"2024-04-04T15:41:00+02:00","Mitja Kolsek","CdweIXCJT5CC0DYgqokohQ",{"blocks":793,"links":794,"value":795},[],[],{"schema":796,"document":797},"dast",{"type":798,"children":799},"root",[800,826,830,842,864,868,873,877,880,884,888,892,896,900,913,933,937,941,974,991,1003],{"type":801,"children":802},"paragraph",[803,806,815,817,824],{"type":804,"value":805},"span"," In December of 2022, ",{"url":807,"meta":808,"type":12,"children":812},"https://twitter.com/nachoskrnl",[809],{"id":810,"value":811},"target","_blank",[813],{"type":804,"value":814},"Ben Barnea",{"type":804,"value":816}," of ",{"url":818,"meta":819,"type":12,"children":821},"https://twitter.com/Akamai",[820],{"id":810,"value":811},[822],{"type":804,"value":823},"Akamai",{"type":804,"value":825}," posted an X thread about a bug they had found in Windows Local Service Manager (LSM) that can lead to local privilege escalation from regular user account to Local System. Ben discovered that code in LSM was missing a return value check after a call is made to RpcImpersonateClient to impersonate the caller: a failed impersonation attempt would therefore keep the code running as Local System.",{"type":801,"children":827},[828],{"type":804,"value":829},"After trying out several ideas to make the RpcImpersonateClient function fail, Ben succeeded with an interesting race condition trick, changing the caller's token after the call has been accepted by LSM, but before the impersonation is attempted.\n",{"type":801,"children":831},[832,834,840],{"type":804,"value":833},"Microsoft assigned this issue ",{"url":835,"meta":836,"type":12,"children":838},"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21771",[837],{"id":810,"value":811},[839],{"type":804,"value":753},{"type":804,"value":841},", and issued a fix for it with January 2023 Windows Updates. ",{"type":801,"children":843},[844,846,853,855,862],{"type":804,"value":845},"Ben's ",{"url":847,"meta":848,"type":12,"children":850},"https://twitter.com/nachoskrnl/status/1625882600777695232",[849],{"id":810,"value":811},[851],{"type":804,"value":852},"X thread",{"type":804,"value":854}," and ",{"url":856,"meta":857,"type":12,"children":859},"https://github.com/akamai/akamai-security-research/tree/main/PoCs/cve-2023-21771",[858],{"id":810,"value":811},[860],{"type":804,"value":861},"proof of concept",{"type":804,"value":863}," allowed us to reproduce the issue and create a micropatch for users of legacy Windows systems, which are no longer receiving security updates from Microsoft. ",{"type":801,"children":865},[866],{"type":804,"value":867},"\n",{"type":869,"level":522,"children":870},"heading",[871],{"type":804,"value":872},"Microsoft's Patch",{"type":801,"children":874},[875],{"type":804,"value":876},"Microsoft patched this issue by adding a check for the return value of RpcImpersonateClient call, and skipping the processing if the call fails.\n",{"type":801,"children":878},[879],{"type":804,"value":867},{"type":869,"level":522,"children":881},[882],{"type":804,"value":883},"Our Micropatch\n",{"type":801,"children":885},[886],{"type":804,"value":887},"Our patch is logically identical to Microsoft's:",{"type":801,"children":889},[890],{"type":804,"value":891},"\n\n;XX-1665\nMODULE_PATH \"..\\AffectedModules\\lsm.dll_10.0.19041.1266_Win10-2004_64-bit_u2021-12\\lsm.dll\"\nPATCH_ID 1725\nPATCH_FORMAT_VER 2\nVULN_ID 7813\nPLATFORM win64\n       \npatchlet_start\n    PATCHLET_ID 1\n    PATCHLET_TYPE 2\n    PATCHLET_OFFSET 0x58a63\n    N_ORIGINALBYTES 5\n    JUMPOVERBYTES 0\n    PIT lsm.dll!0x58a7a\n    \n    code_start\n        \n        cmp rax, 0x0        ;check if RpcImpersonateClient returned 0 for success\n        jne PIT_0x58a7a     ;if not, jump to the error block\n       \n    code_end\npatchlet_end\n\n",{"type":801,"children":893},[894],{"type":804,"value":895}," ",{"type":869,"level":522,"children":897},[898],{"type":804,"value":899},"Micropatch Availability\n",{"type":801,"children":901},[902,904,911],{"type":804,"value":903},"Micropatches were written for the following ",{"url":905,"meta":906,"type":12,"children":908},"https://0patch.zendesk.com/hc/en-us/articles/4403751356050",[907],{"id":810,"value":811},[909],{"type":804,"value":910},"security-adopted",{"type":804,"value":912}," versions of Windows with all available Windows Updates installed:",{"type":914,"style":915,"children":916},"list","numbered",[917,926],{"type":918,"children":919},"listItem",[920],{"type":801,"children":921},[922],{"type":804,"marks":923,"value":925},[924],"strong","Windows 10 v21H1 - fully updated",{"type":918,"children":927},[928],{"type":801,"children":929},[930],{"type":804,"marks":931,"value":932},[924],"Windows 10 v2004 - fully updated",{"type":801,"children":934},[935],{"type":804,"value":936}," Older Windows 10 versions, Windows 7 and Server 2008 R2 were not affected by this issue. Newer Windows 10 versions received an official patch from Microsoft.\n  Micropatches have already been distributed to, and applied on, all online 0patch Agents in PRO or Enterprise accounts (unless Enterprise group settings prevent that). ",{"type":801,"children":938},[939],{"type":804,"value":940},"Vulnerabilities like this get discovered on a regular basis, and attackers know about them all. If you're using Windows that aren't receiving official security updates anymore, 0patch will make sure these vulnerabilities won't be exploited on your computers - and you won't even have to know or care about these things.\n",{"type":801,"children":942},[943,945,955,957,965,967,972],{"type":804,"value":944},"If you're new to 0patch, create a free account in ",{"url":946,"meta":947,"type":12,"children":952},"https://central.0patch.com",[948,951],{"id":949,"value":950},"rel","url noopener noreferrer",{"id":810,"value":811},[953],{"type":804,"value":954},"0patch Central",{"type":804,"value":956},", then install and register 0patch Agent from ",{"url":958,"meta":959,"type":12,"children":962},"https://t.co/UMXoQqpLQh",[960,961],{"id":949,"value":950},{"id":810,"value":811},[963],{"type":804,"value":964},"0patch.com",{"type":804,"value":966},", and email ",{"url":968,"type":12,"children":969},"mailto:sales@0patch.com",[970],{"type":804,"value":971},"sales@0patch.com",{"type":804,"value":973}," for a trial. Everything else will happen automatically. No computer reboot will be needed.",{"type":801,"children":975},[976,978,983,984,989],{"type":804,"value":977},"We would like to thank  ",{"url":807,"meta":979,"type":12,"children":981},[980],{"id":810,"value":811},[982],{"type":804,"value":814},{"type":804,"value":816},{"url":818,"meta":985,"type":12,"children":987},[986],{"id":810,"value":811},[988],{"type":804,"value":823},{"type":804,"value":990}," for sharing their analysis, which made it possible for us to create a micropatch for this issue.\n",{"type":801,"children":992},[993,995,1001],{"type":804,"value":994},"To learn more about 0patch, please visit our ",{"url":996,"meta":997,"type":12,"children":999},"https://0patch.zendesk.com/hc/en-us",[998],{"id":810,"value":811},[1000],{"type":804,"value":97},{"type":804,"value":1002},".",{"type":801,"children":1004},[1005],{"type":804,"value":895},{"alt":753,"url":1007,"width":1008,"height":1009,"responsiveImage":1010},"https://www.datocms-assets.com/166020/1774002325-7813_vulncard.png",1600,800,{"srcSet":1011,"webpSrcSet":1012,"sizes":1013,"src":1014,"width":1015,"height":1016,"aspectRatio":228,"alt":753,"title":18,"bgColor":1017,"base64":1018},"https://www.datocms-assets.com/166020/1774002325-7813_vulncard.png?auto=compress&crop=focalpoint&dpr=0.25&fit=crop&w=1440 360w,https://www.datocms-assets.com/166020/1774002325-7813_vulncard.png?auto=compress&crop=focalpoint&dpr=0.5&fit=crop&w=1440 720w,https://www.datocms-assets.com/166020/1774002325-7813_vulncard.png?auto=compress&crop=focalpoint&dpr=0.75&fit=crop&w=1440 1080w,https://www.datocms-assets.com/166020/1774002325-7813_vulncard.png?auto=compress&crop=focalpoint&fit=crop&w=1440 1440w","https://www.datocms-assets.com/166020/1774002325-7813_vulncard.png?auto=compress&crop=focalpoint&dpr=0.25&fit=crop&fm=webp&w=1440 360w,https://www.datocms-assets.com/166020/1774002325-7813_vulncard.png?auto=compress&crop=focalpoint&dpr=0.5&fit=crop&fm=webp&w=1440 720w,https://www.datocms-assets.com/166020/1774002325-7813_vulncard.png?auto=compress&crop=focalpoint&dpr=0.75&fit=crop&fm=webp&w=1440 1080w,https://www.datocms-assets.com/166020/1774002325-7813_vulncard.png?auto=compress&crop=focalpoint&fit=crop&fm=webp&w=1440 1440w","(max-width: 1440px) 100vw, 1440px","https://www.datocms-assets.com/166020/1774002325-7813_vulncard.png?auto=compress&crop=focalpoint&fit=crop&w=1440",1440,720,"#ffc001","data:image/png;base64,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",1780067946645]