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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/166020/1755778743-vuln_7058_cve-2021-26415-patchcard_twitter_1024x512.png?auto=format&fit=max&w=1200",{"tag":722,"attributes":743,"content":18},{"property":744,"content":745},"og:image:width","640",{"tag":722,"attributes":747,"content":18},{"property":748,"content":749},"og:image:height","320",{"tag":722,"attributes":751,"content":18},{"property":752,"content":720},"og:image:alt",{"tag":722,"attributes":754,"content":18},{"name":755,"content":741},"twitter:image",{"tag":722,"attributes":757,"content":18},{"name":758,"content":720},"twitter:image:alt",{"tag":722,"attributes":760,"content":18},{"property":761,"content":32},"og:locale",{"tag":722,"attributes":763,"content":18},{"property":764,"content":77},"og:type",{"tag":722,"attributes":766,"content":18},{"property":767,"content":6},"og:site_name",{"tag":722,"attributes":769,"content":18},{"property":770,"content":771},"article:modified_time","2025-09-05T14:51:33Z",{"tag":722,"attributes":773,"content":18},{"property":774,"content":40},"article:publisher",{"tag":722,"attributes":776,"content":18},{"name":777,"content":778},"twitter:card","summary",{"tag":722,"attributes":780,"content":18},{"name":781,"content":782},"robots","noindex",[784],{"value":785,"locale":32},"another-windows-installer-local",[787],{"value":42,"locale":32},"2021-05-06T16:24:00+02:00","Mitja Kolsek","2025-08-21T14:19:09+02:00","Bl8XF64QQhCYNfzfMHJOOA",{"blocks":793,"links":806,"value":807},[794],{"id":795,"_modelApiKey":796,"__typename":797,"video":798},"VercI4XETxa-drxL_WfrQg","video_external","VideoExternalRecord",{"url":799,"title":800,"thumbnailUrl":801,"height":802,"provider":803,"providerUid":804,"width":805},"https://www.youtube.com/watch?v=EI8aVoh3gvs","0patching CVE-2021-26415","https://i.ytimg.com/vi/EI8aVoh3gvs/hqdefault.jpg",113,"youtube","EI8aVoh3gvs",200,[],{"schema":808,"document":809},"dast",{"type":810,"children":811},"root",[812,836,840,844,848,852,856,860,864,868,870,897],{"type":813,"children":814},"paragraph",[815,818,823,825,834],{"type":816,"value":817},"span","On April 21, security researcher ",{"url":819,"type":12,"children":820},"https://twitter.com/a_denkiewicz",[821],{"type":816,"value":822},"Adrian Denkiewicz",{"type":816,"value":824}," published an ",{"url":826,"meta":827,"type":12,"children":831},"https://www.cloaked.pl/2021/04/cve-2021-26415/",[828],{"id":829,"value":830},"target","_blank",[832],{"type":816,"value":833},"in-depth analysis",{"type":816,"value":835}," of a local privilege escalation vulnerability in Windows Installer that was fixed by April 2021 Windows Updates. Adrian's analysis included a proof-of-concept.",{"type":813,"children":837},[838],{"type":816,"value":839},"The vulnerability is a classical symbolic-link issue, whereby a privileged process (in this case, msiexec.exe) works with a file (in this case, installer log file) that the attacker is able to \"redirect\" to another location where the they do not have permissions to create or modify files.",{"type":813,"children":841},[842],{"type":816,"value":843},"Since attacker has limited control over the content of installer log file, and cannot modify the redirected log file after it has been created, Adrian had to be creative and found a working attack scenario in creating/overwriting PowerShell profile file (C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\profile.ps1) that gets loaded whenever anyone, ideally admin, uses PowerShell.",{"type":813,"children":845},[846],{"type":816,"value":847},"In essence, Microsoft's fix included a call to function IsAdmin from function CreateLog, which is in charge of creating installer log file. Some permissions checking was already in place before in this function but was not resilient to the \"bait-and-switch\" symbolic link trick that has been successful against many Windows products before, and will surely be successful against many more to come.\n",{"type":813,"children":849},[850],{"type":816,"value":851},"Our micropatch does logically the same as Microsoft's fix. Here is its source code for 64-bit Windows 7 and Server 2008 R2 with its 7 CPU instructions.",{"type":813,"children":853},[854],{"type":816,"value":855},"\n\nMODULE_PATH \"..\\Affected_Modules\\msi.dll_5.0.7601.24535_64bit\\msi.dll\"\nPATCH_ID 604\nPATCH_FORMAT_VER 2\nVULN_ID 7058\nPLATFORM win64\n\npatchlet_start\n PATCHLET_ID 1\n PATCHLET_TYPE 2\n PATCHLET_OFFSET 0xf5a55               ; First GetCurrentThread block in CreateLog function\n                                       ; instruction lea r9, [rsp+98h+TokenHandle]\n    N_ORIGINALBYTES 5\n    JUMPOVERBYTES 0\n    PIT msi.dll!0xf5b31,msi.dll!0xef7f8   ; Address of block to jump to; IsAdmin function\n    \n    code_start\n        push rax                      ;Save the GetCurrentThread return\n        push rax                      ;Push one more time to fix stack alignment\n        call PIT_0xef7f8              ;Call IsAdmin (ret 1 if admin, 0 if not)\n        cmp rax, 0                    ;Check if user is admin\n        pop rax                       ;Restore the GetCurrentThread return and fix stack alignment again\n        pop rax\n        je PIT_0xf5b31                ;If user is not an admin, jump over the scond createfile block\n    code_end\n    \npatchlet_end\n\n",{"type":813,"children":857},[858],{"type":816,"value":859}," ",{"type":813,"children":861},[862],{"type":816,"value":863},"See the micropatch in action here:",{"type":813,"children":865},[866],{"type":816,"value":867},"\n\n\n",{"item":795,"type":869},"block",{"type":813,"children":871},[872,874,880,882,887,889,895],{"type":816,"value":873},"We'd like to thank Adrian Denkiewicz for sharing their analysis and POC, which allowed us to create this micropatch for Windows users without official security updates. We also encourage security researchers to privately share their analyses with us for micropatching.\nThis micropatch is immediately available to all 0patch users with a PRO license, and is already downloaded and applied on all online 0patch-protected Windows 7 and Windows Server 2008 R2 machines without Extended Security Updates, or with year 1 of Extended Security Updates.\nTo obtain the micropatch and have it applied on your computer(s) along with other micropatches included with a PRO license, create an account in ",{"url":693,"meta":875,"type":12,"children":877},[876],{"id":829,"value":830},[878],{"type":816,"value":879},"0patch Central",{"type":816,"value":881},", install 0patch Agent and register it to your account. Note that no computer restart is needed for installing the agent or applying/un-applying any 0patch micropatch. \nAnd don't forget, if your organization has Windows 7 or Server 2008 R2 machines with Extended Security Updates and wouldn't mind saving lots of money on less expensive low-risk security patches in 2021 that don't even need your machines to be restarted, contact ",{"url":883,"type":12,"children":884},"mailto:sales@0patch.com",[885],{"type":816,"value":886},"sales@0patch.com",{"type":816,"value":888},".\n\nTo learn more about 0patch, please visit our ",{"url":890,"meta":891,"type":12,"children":893},"https://0patch.zendesk.com/hc/en-us",[892],{"id":829,"value":830},[894],{"type":816,"value":97},{"type":816,"value":896},". ",{"type":813,"children":898},[899],{"type":816,"value":40},{"alt":720,"url":901,"width":902,"height":903,"responsiveImage":904},"https://www.datocms-assets.com/166020/1755778743-vuln_7058_cve-2021-26415-patchcard_twitter_1024x512.png",640,320,{"srcSet":905,"webpSrcSet":906,"sizes":907,"src":908,"width":909,"height":910,"aspectRatio":228,"alt":720,"title":720,"bgColor":911,"base64":912},"https://www.datocms-assets.com/166020/1755778743-vuln_7058_cve-2021-26415-patchcard_twitter_1024x512.png?auto=compress&crop=focalpoint&dpr=0.25&fit=crop&w=1440 360w,https://www.datocms-assets.com/166020/1755778743-vuln_7058_cve-2021-26415-patchcard_twitter_1024x512.png?auto=compress&crop=focalpoint&fit=crop&w=1440 1440w","https://www.datocms-assets.com/166020/1755778743-vuln_7058_cve-2021-26415-patchcard_twitter_1024x512.png?auto=compress&crop=focalpoint&dpr=0.25&fit=crop&fm=webp&w=1440 360w,https://www.datocms-assets.com/166020/1755778743-vuln_7058_cve-2021-26415-patchcard_twitter_1024x512.png?auto=compress&crop=focalpoint&fit=crop&fm=webp&w=1440 1440w","(max-width: 1440px) 100vw, 1440px","https://www.datocms-assets.com/166020/1755778743-vuln_7058_cve-2021-26415-patchcard_twitter_1024x512.png?auto=compress&crop=focalpoint&fit=crop&w=1440",1440,720,"#c05aaf","data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wCEAAoHBwgHBgoQCAgLEA0NDRANDQoNDhENFhENFxMZGBYVFiEaHysjGh0oHRUWJTUlKC0vMjIyGSI4PTcwPCsxMi8BCgsLDg0OHA0NHC8cFhwvLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vL//AABEIAAwAGAMBIgACEQEDEQH/xAAZAAABBQAAAAAAAAAAAAAAAAAEAAIDBQb/xAAdEAABAwUBAAAAAAAAAAAAAAABAAMEAgUSITET/8QAFgEBAQEAAAAAAAAAAAAAAAAABQIA/8QAFhEBAQEAAAAAAAAAAAAAAAAAABIR/9oADAMBAAIRAxEAPwDT2yIyGeo8xGMeqpg1Hy6jcjiNovQFo7jGZDGkk+ZSDG2ksun/2Q==",1780067957972]