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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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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/166020/1774002324-7618_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-2023-21752",{"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","2026-04-02T12:29:00Z",{"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},"micropatching-arbitrary-file-delete",[788],{"value":42,"locale":32},"2023-01-31T17:40:00+01:00","Mitja Kolsek","f0o9VGy_Qwyjs8CxUpVrmg",{"blocks":793,"links":805,"value":806},[794],{"id":795,"_modelApiKey":796,"__typename":797,"video":798},"WepGxtBlQjKOtjfcKeSHqw","video_external","VideoExternalRecord",{"url":799,"title":720,"thumbnailUrl":800,"height":801,"provider":802,"providerUid":803,"width":804},"https://www.youtube.com/watch?v=SvAeNzYc6WI","https://i.ytimg.com/vi/SvAeNzYc6WI/hqdefault.jpg",113,"youtube","SvAeNzYc6WI",200,[],{"schema":807,"document":808},"dast",{"type":809,"children":810},"root",[811,828,832,837,850,854,858,862,920,924,927,931,944,947,951,955,959,963,966,968,972,976,983,1037,1041,1045,1078,1090,1101],{"type":812,"children":813},"paragraph",[814,817,826],{"type":815,"value":816},"span"," January 2023 Windows Updates brought a fix for a local privilege escalation vulnerability in Windows Backup Service, discovered and reported by ",{"url":818,"meta":819,"type":12,"children":823},"https://twitter.com/filip_dragovic",[820],{"id":821,"value":822},"target","_blank",[824],{"type":815,"value":825},"Filip Dragovic",{"type":815,"value":827},". The vulnerability allows a non-admin user on the machine to execute arbitrary code as Local System and thereby take over the computer.",{"type":812,"children":829},[830],{"type":815,"value":831}," ",{"type":833,"level":522,"children":834},"heading",[835],{"type":815,"value":836},"The Backup Service\n",{"type":812,"children":838},[839,841,848],{"type":815,"value":840},"The intended use of the Backup Service is through local user interface of the legacy \"",{"url":842,"meta":843,"type":12,"children":845},"https://en.wikipedia.org/wiki/Backup_and_Restore",[844],{"id":821,"value":822},[846],{"type":815,"value":847},"Backup and Restore (Windows 7)",{"type":815,"value":849},"\" component, still existing on all Windows 10 and Windows 11 computers. A privileged user launches Backup and Restore, selects the backup destination and what they want to backup, and starts or schedules a backup. The destination can either be a local drive or a network path, and in the latter case, network credentials have to be supplied as well. The Backup Service uses these credentials for accessing the network share.",{"type":812,"children":851},[852],{"type":815,"value":853},"\n",{"type":833,"level":522,"children":855},[856],{"type":815,"value":857},"The Vulnerability\n",{"type":812,"children":859},[860],{"type":815,"value":861},"The vulnerability lies in the way Windows Backup Service tries to determine whether the user whose credentials were supplied has write access on the chosen destination or not. Specifically, the service attempts to create a temporary, randomly-named file on the destination path using these credentials; if this fails, the path is considered non-writable and the backup procedure can't continue, but if temporary file creation succeeds, the file is immediately deleted and the backup procedure can continue as the path is confirmed to be writable.",{"type":812,"children":863},[864,866,873,875,882,884,891,893,900,902,909,911,918],{"type":815,"value":865},"Now, the process of creating and deleting this temporary file is vulnerable to a ",{"url":867,"meta":868,"type":12,"children":870},"https://en.wikipedia.org/wiki/Time-of-check_to_time-of-use",[869],{"id":821,"value":822},[871],{"type":815,"value":872},"TOCTOU",{"type":815,"value":874}," symbolic link attack. As Filip has demonstrated, a local low-privileged attacker can trigger the backup process with some path under their control, catch the temporary file which the Backup Service creates (and hold it locked), replace it with a symbolic link to some system file they could not otherwise delete, and let the Backup Service continue with deleting said system file. This results in the service deleting a chosen file, which can be exploited for arbitrary code execution as Local System as was first shown by ",{"url":876,"meta":877,"type":12,"children":879},"https://twitter.com/jonasLyk",[878],{"id":821,"value":822},[880],{"type":815,"value":881},"Jonas Lykkegård",{"type":815,"value":883}," in 2020 using ",{"url":885,"meta":886,"type":12,"children":888},"https://secret.club/2020/04/23/directory-deletion-shell.html",[887],{"id":821,"value":822},[889],{"type":815,"value":890},"Windows Error Reporting Service",{"type":815,"value":892},", and subsequently also by ",{"url":894,"meta":895,"type":12,"children":897},"https://twitter.com/KLINIX5",[896],{"id":821,"value":822},[898],{"type":815,"value":899},"Abdelhamid Naceri",{"type":815,"value":901}," using ",{"url":903,"meta":904,"type":12,"children":906},"https://www.zerodayinitiative.com/blog/2022/3/16/abusing-arbitrary-file-deletes-to-escalate-privilege-and-other-great-tricks",[905],{"id":821,"value":822},[907],{"type":815,"value":908},"Windows Installer",{"type":815,"value":910},". Filip's ",{"url":912,"meta":913,"type":12,"children":915},"https://github.com/Wh04m1001/CVE-2023-21752",[914],{"id":821,"value":822},[916],{"type":815,"value":917},"POC",{"type":815,"value":919}," makes use of the latter.\n",{"type":812,"children":921},[922],{"type":815,"value":923},"But, one could reasonably ask, why does the Backup Service use its own Local System identity instead of user-supplied credentials for creating and deleting the temporary file? Well, it turns out that user-supplied credentials are indeed used for network paths pointing to other computers - but when a share on the same computer is used (such as \\\\127.0.0.1\\C$, the computer's administrative share), the service keeps using its own identity, i.e. Local System.\n",{"type":812,"children":925},[926],{"type":815,"value":853},{"type":833,"level":522,"children":928},[929],{"type":815,"value":930},"Microsoft's Patch",{"type":812,"children":932},[933,935,942],{"type":815,"value":934},"Microsoft's patch for this vulnerability introduced a completely redesigned test for path writability, whereby a temporary file is created using the ",{"url":936,"meta":937,"type":12,"children":939},"https://learn.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-createfilea",[938],{"id":821,"value":822},[940],{"type":815,"value":941},"FILE_FLAG_DELETE_ON_CLOSE",{"type":815,"value":943}," flag. This flag makes sure that the file, if created, would get automatically deleted when closed - making this entire test an atomic operation from the perspective of TOCTOU shenanigans.",{"type":812,"children":945},[946],{"type":815,"value":853},{"type":833,"level":522,"children":948},[949],{"type":815,"value":950},"Our Micropatch",{"type":812,"children":952},[953],{"type":815,"value":954},"Our micropatch is logically identical to Microsoft's, but to minimize its complexity and code size we opted for a simpler naming of the temporary file: we start with creating a file 0patchTMP_A.tmp, then failing that continue with 0patchTMP_B.tmp, and so on until 0patchTMP_Z.tmp. If any of these files can be created, the path is considered writable, otherwise it is considered unwritable.\n",{"type":812,"children":956},[957],{"type":815,"value":958},"This is to accommodate multiple backup processes using the same path at the same time, which is unlikely but not impossible. One might think that an attacker could create files 0patchTMP_A.tmp through 0patchTMP_Z.tmp on the backup path to trick our patch into thinking the path was unwritable, but then again, if the attacker has write access to your backup location, no patch is going to save you.",{"type":812,"children":960},[961],{"type":815,"value":962},"Let's see our micropatch in action. With 0patch disabled, Filip's POC can delete a file on the root of C: drive by exploiting the described vulnerability. With 0patch enabled and our micropatch in place, the vulnerability is no longer there and the same file does not get deleted.\n",{"type":812,"children":964},[965],{"type":815,"value":853},{"item":795,"type":967},"block",{"type":812,"children":969},[970],{"type":815,"value":971},"\n\n",{"type":833,"level":522,"children":973},[974],{"type":815,"value":975},"Micropatch Availability\n",{"type":812,"children":977},[978,980],{"type":815,"value":979},"The micropatch was written for the following Versions of Windows with all available Windows Updates installed:",{"type":815,"marks":981,"value":831},[982],"strong",{"type":984,"style":985,"children":986},"list","numbered",[987,995,1002,1009,1016,1023,1030],{"type":988,"children":989},"listItem",[990],{"type":812,"children":991},[992],{"type":815,"marks":993,"value":994},[982],"Windows 10 v21H1",{"type":988,"children":996},[997],{"type":812,"children":998},[999],{"type":815,"marks":1000,"value":1001},[982],"Windows 10 v2004",{"type":988,"children":1003},[1004],{"type":812,"children":1005},[1006],{"type":815,"marks":1007,"value":1008},[982],"Windows 10 v1909",{"type":988,"children":1010},[1011],{"type":812,"children":1012},[1013],{"type":815,"marks":1014,"value":1015},[982],"Windows 10 v1809",{"type":988,"children":1017},[1018],{"type":812,"children":1019},[1020],{"type":815,"marks":1021,"value":1022},[982],"Windows 10 v1803",{"type":988,"children":1024},[1025],{"type":812,"children":1026},[1027],{"type":815,"marks":1028,"value":1029},[982],"Windows 7 (no ESU, ESU years 1 and 2)",{"type":988,"children":1031},[1032],{"type":812,"children":1033},[1034],{"type":815,"marks":1035,"value":1036},[982],"Windows Server 2008 R2 (no ESU, ESU years 1 and 2)",{"type":812,"children":1038},[1039],{"type":815,"value":1040}," Note that Windows 7 and Server 2008 R2 with ESU year 3 have received Microsoft's patch with January Updates.\n",{"type":812,"children":1042},[1043],{"type":815,"value":1044},"This micropatch has already been distributed to, and applied on, all online 0patch Agents in PRO or Enterprise accounts (unless Enterprise group settings prevent that). ",{"type":812,"children":1046},[1047,1049,1059,1061,1069,1071,1076],{"type":815,"value":1048},"If you're new to 0patch, create a free account in ",{"url":1050,"meta":1051,"type":12,"children":1056},"https://central.0patch.com",[1052,1055],{"id":1053,"value":1054},"rel","url noopener noreferrer",{"id":821,"value":822},[1057],{"type":815,"value":1058},"0patch Central",{"type":815,"value":1060},", then install and register 0patch Agent from ",{"url":1062,"meta":1063,"type":12,"children":1066},"https://t.co/UMXoQqpLQh",[1064,1065],{"id":1053,"value":1054},{"id":821,"value":822},[1067],{"type":815,"value":1068},"0patch.com",{"type":815,"value":1070},", and email ",{"url":1072,"type":12,"children":1073},"mailto:sales@0patch.com",[1074],{"type":815,"value":1075},"sales@0patch.com",{"type":815,"value":1077}," for a trial. Everything else will happen automatically. No computer reboot will be needed.",{"type":812,"children":1079},[1080,1082,1088],{"type":815,"value":1081},"To learn more about 0patch, please visit our ",{"url":1083,"meta":1084,"type":12,"children":1086},"https://0patch.zendesk.com/hc/en-us",[1085],{"id":821,"value":822},[1087],{"type":815,"value":97},{"type":815,"value":1089},". ",{"type":812,"children":1091},[1092,1094,1099],{"type":815,"value":1093},"We'd like to thank  ",{"url":818,"meta":1095,"type":12,"children":1097},[1096],{"id":821,"value":822},[1098],{"type":815,"value":825},{"type":815,"value":1100}," for sharing details about this vulnerability, which allowed us to create a micropatch and protect our users. We also encourage security researchers to privately share their analyses with us for micropatching.",{"type":812,"children":1102},[1103],{"type":815,"value":831},{"alt":753,"url":1105,"width":1106,"height":1107,"responsiveImage":1108},"https://www.datocms-assets.com/166020/1774002324-7618_vulncard.png",1600,800,{"srcSet":1109,"webpSrcSet":1110,"sizes":1111,"src":1112,"width":1113,"height":1114,"aspectRatio":228,"alt":753,"title":18,"bgColor":1115,"base64":1116},"https://www.datocms-assets.com/166020/1774002324-7618_vulncard.png?auto=compress&crop=focalpoint&dpr=0.25&fit=crop&w=1440 360w,https://www.datocms-assets.com/166020/1774002324-7618_vulncard.png?auto=compress&crop=focalpoint&dpr=0.5&fit=crop&w=1440 720w,https://www.datocms-assets.com/166020/1774002324-7618_vulncard.png?auto=compress&crop=focalpoint&dpr=0.75&fit=crop&w=1440 1080w,https://www.datocms-assets.com/166020/1774002324-7618_vulncard.png?auto=compress&crop=focalpoint&fit=crop&w=1440 1440w","https://www.datocms-assets.com/166020/1774002324-7618_vulncard.png?auto=compress&crop=focalpoint&dpr=0.25&fit=crop&fm=webp&w=1440 360w,https://www.datocms-assets.com/166020/1774002324-7618_vulncard.png?auto=compress&crop=focalpoint&dpr=0.5&fit=crop&fm=webp&w=1440 720w,https://www.datocms-assets.com/166020/1774002324-7618_vulncard.png?auto=compress&crop=focalpoint&dpr=0.75&fit=crop&fm=webp&w=1440 1080w,https://www.datocms-assets.com/166020/1774002324-7618_vulncard.png?auto=compress&crop=focalpoint&fit=crop&fm=webp&w=1440 1440w","(max-width: 1440px) 100vw, 1440px","https://www.datocms-assets.com/166020/1774002324-7618_vulncard.png?auto=compress&crop=focalpoint&fit=crop&w=1440",1440,720,"#ffc001","data:image/png;base64,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",1780067944738]