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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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fill=\"currentColor\"/>\u003C/g>",{"article":713},{"_firstPublishedAt":714,"_publishedAt":715,"_updatedAt":716,"_seoMetaTags":717,"_allSlugLocales":784,"_allPublishTranslationLocales":787,"published":789,"__typename":683,"_modelApiKey":77,"author":790,"createdAt":714,"id":791,"excerpt":40,"body":792,"image":1027,"readTime":40,"title":720,"slug":786,"publishTranslation":42,"seoMetadata":18},"2025-08-21T14:27:13+02:00","2026-04-02T15:12:12+02:00","2026-04-02T15:12:11+02:00",[718,721,725,728,732,735,738,742,746,750,754,757,760,763,766,769,773,776,780],{"tag":719,"attributes":18,"content":720},"title","Micropatches for two Windows Print Spooler Elevation of Privilege issues (CVE-2022-30206, CVE-2022-21997)",{"tag":722,"attributes":723,"content":18},"meta",{"property":724,"content":720},"og:title",{"tag":722,"attributes":726,"content":18},{"name":727,"content":720},"twitter:title",{"tag":722,"attributes":729,"content":18},{"name":730,"content":731},"description","This is a 0patch 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/166020/1775135459-7313_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-2022-30206, CVE-2022-21997",{"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","2026-04-02T13:12:11Z",{"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-two-windows-print",[788],{"value":42,"locale":32},"2022-10-26T21:28:00+02:00","Mitja Kolsek","eY77dmd2SwuigEC-r9lbwQ",{"blocks":793,"links":794,"value":795},[],[],{"schema":796,"document":797},"dast",{"type":798,"children":799},"root",[800,835,857,870,874,878,897,901,921,925,929,986,998,1016],{"type":801,"children":802},"paragraph",[803,806,815,817,824,826,833],{"type":804,"value":805},"span","On September 24, 2022 we were made aware of a ",{"url":807,"meta":808,"type":12,"children":812},"https://github.com/Pwnrin/CVE-2022-30206",[809],{"id":810,"value":811},"target","_blank",[813],{"type":804,"value":814},"POC",{"type":804,"value":816}," for a Print Spooler elevation of privilege vulnerability discovered by security researcher ",{"url":818,"meta":819,"type":12,"children":821},"https://twitter.com/uuulucky",[820],{"id":810,"value":811},[822],{"type":804,"value":823},"luckyu",{"type":804,"value":825}," with ",{"url":827,"meta":828,"type":12,"children":830},"https://www.nsfocus.com.cn/",[829],{"id":810,"value":811},[831],{"type":804,"value":832},"NSFOCUS TIANYUAN LAB",{"type":804,"value":834},". It turned out to be another symbolic link issue that Print Spooler has quite a history of.\n",{"type":801,"children":836},[837,839,846,848,855],{"type":804,"value":838},"The POC sets up a new printer with a custom spool directory as a non-admin user. This directory is a symbolic link to another directory, which contains a .SHD file that is itself again a symbolic link to some existing file which a non-admin user lacks permissions to delete. Then, by using file locking and performing some operations on the printer, the Print Spooler process (running as Local System) is made to delete said .SHD file, which in fact deletes the file it points to. A non-admin can therefore delete any local file that Local System is able to delete. This can, surprisingly, lead to arbitrary code execution using a trick earlier discovered by another researcher ",{"url":840,"meta":841,"type":12,"children":843},"https://twitter.com/KLINIX5",[842],{"id":810,"value":811},[844],{"type":804,"value":845},"Abdelhamid Naceri",{"type":804,"value":847}," and described in ",{"url":849,"meta":850,"type":12,"children":852},"https://www.zerodayinitiative.com/blog/2022/3/16/abusing-arbitrary-file-deletes-to-escalate-privilege-and-other-great-tricks",[851],{"id":810,"value":811},[853],{"type":804,"value":854},"this ZDI article",{"type":804,"value":856},".",{"type":801,"children":858},[859,861,868],{"type":804,"value":860},"Microsoft assigned CVE-2022-30206 to this issue and fixed it with ",{"url":862,"meta":863,"type":12,"children":865},"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-30206",[864],{"id":810,"value":811},[866],{"type":804,"value":867},"July 2022 updates",{"type":804,"value":869},". Not for everyone, of course: we determined that older Windows versions that had stopped receiving updates by then were also affected, and therefore needed our patch.\n",{"type":801,"children":871},[872],{"type":804,"value":873},"Having decided to patch this issue, we analyzed it, found the root cause and determined that the best approach would be similar to what we've done with other symbolic link issues in Print Spooler before: add a check in localspl.dll before the DeleteFile call to see if a path to the .SHD file is a symbolic link - and skip the deletion in case it was. This would not break the typical use case without symbolic links, and we doubt that any legitimate use case would involve a .SHD file being a symbolic link.",{"type":801,"children":875},[876],{"type":804,"value":877},"Having written such micropatch, we started testing it and discovered something peculiar: the linked-to file still got deleted even if our patch properly bypassed the DeleteFile call. What was going on?",{"type":801,"children":879},[880,882,886,888,895],{"type":804,"value":881},"It turned out that while we ",{"type":804,"marks":883,"value":885},[884],"emphasis","have",{"type":804,"value":887}," patched the issue at hand, there was another very similar issue elsewhere in the code that also led to deleting the .SHD file. Interestingly though, this issue was not present on a Windows 10 v1909 updated to its last updates in May 2022. This version of Windows 10 was the last ",{"url":889,"meta":890,"type":12,"children":892},"https://0patch.zendesk.com/hc/en-us/articles/4403751356050",[891],{"id":810,"value":811},[893],{"type":804,"value":894},"security-adopted",{"type":804,"value":896}," Windows version at the time and received Windows updates a bit longer than others - which meant that it must have received a patch for this \"newly discovered\" issue while others haven't.",{"type":801,"children":898},[899],{"type":804,"value":900},"To identify this second issue, we tested the POC with our patch on Windows 10 v1909 with different Windows updates starting with May 2022 (the last updates for v1909) and going back in time. This revealed that the issue was fixed with February 2022 updates.",{"type":801,"children":902},[903,905,912,914,919],{"type":804,"value":904},"Looking at all vulnerabilities fixed with February 2022 updates, only one fit the description: ",{"url":906,"meta":907,"type":12,"children":909},"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-21997",[908],{"id":810,"value":811},[910],{"type":804,"value":911},"CVE-2022-21997",{"type":804,"value":913},". It was a \"Windows Print Spooler Elevation of Privilege Vulnerability\", with the Microsoft advisory stating that \"an attacker would only be able to delete targeted files on a system.\" The issue was reported by ",{"url":915,"type":12,"children":916},"https://wubonetcn.github.io/",[917],{"type":804,"value":918},"Bo Wu",{"type":804,"value":920},", whom we tried to contact for confirmation but unfortunately so far failed to reach.",{"type":801,"children":922},[923],{"type":804,"value":924},"In any case, it would make no sense to only patch the originally intended CVE-2022-30206, so we also went on to patch this \"bonus\" issue CVE-2022-21997. We did that with an identical patch, just in another location in localspl.dll. With both patches in place, the POC and the technique it was using no longer worked.\n",{"type":801,"children":926},[927],{"type":804,"value":928},"These micropatches were written for the following Versions of Windows with all available Windows Updates installed:",{"type":930,"style":931,"children":932},"list","numbered",[933,942,949,956,963,970,977],{"type":934,"children":935},"listItem",[936],{"type":801,"children":937},[938],{"type":804,"marks":939,"value":941},[940],"strong","Windows 10 v2004",{"type":934,"children":943},[944],{"type":801,"children":945},[946],{"type":804,"marks":947,"value":948},[940],"Windows 10 v1909 (CVE-2022-30206 only)",{"type":934,"children":950},[951],{"type":801,"children":952},[953],{"type":804,"marks":954,"value":955},[940],"Windows 10 v1903",{"type":934,"children":957},[958],{"type":801,"children":959},[960],{"type":804,"marks":961,"value":962},[940],"Windows 10 v1809",{"type":934,"children":964},[965],{"type":801,"children":966},[967],{"type":804,"marks":968,"value":969},[940],"Windows 10 v1803",{"type":934,"children":971},[972],{"type":801,"children":973},[974],{"type":804,"marks":975,"value":976},[940],"Windows 7 without ESU, with year 1 of ESU and with year 2 of ESU",{"type":934,"children":978},[979],{"type":801,"children":980},[981,984],{"type":804,"marks":982,"value":983},[940],"Windows Server 2008 R2 without ESU, with year 1 of ESU and with year 2 of ESU",{"type":804,"value":985},"\n",{"type":801,"children":987},[988,990,996],{"type":804,"value":989},"  Micropatches have already been distributed to all online 0patch Agents with a PRO or Enterprise license. To obtain these micropatches and have them applied on your computers along with our other micropatches, create an account in ",{"url":693,"meta":991,"type":12,"children":993},[992],{"id":810,"value":811},[994],{"type":804,"value":995},"0patch Central",{"type":804,"value":997},", install 0patch Agent and register it to your account with a PRO or Enterprise subscription. Note that no computer restart is needed for installing the agent or applying/un-applying any 0patch micropatch.\n",{"type":801,"children":999},[1000,1002,1008,1010,1015],{"type":804,"value":1001},"To learn more about 0patch, please visit our ",{"url":1003,"meta":1004,"type":12,"children":1006},"https://0patch.zendesk.com/hc/en-us",[1005],{"id":810,"value":811},[1007],{"type":804,"value":97},{"type":804,"value":1009},". For a trial or demo please contact ",{"url":1011,"type":12,"children":1012},"mailto:sales@0patch.com",[1013],{"type":804,"value":1014},"sales@0patch.com",{"type":804,"value":856},{"type":801,"children":1017},[1018,1020,1025],{"type":804,"value":1019},"We'd like to thank ",{"url":818,"meta":1021,"type":12,"children":1023},[1022],{"id":810,"value":811},[1024],{"type":804,"value":823},{"type":804,"value":1026}," for publishing their analysis with a proof-of-concept that allowed us to reproduce both vulnerabilities and create a micropatch. We also encourage security researchers to privately share their analyses with us for micropatching.",{"alt":753,"url":1028,"width":1029,"height":1030,"responsiveImage":1031},"https://www.datocms-assets.com/166020/1775135459-7313_vulncard.png",1600,800,{"srcSet":1032,"webpSrcSet":1033,"sizes":1034,"src":1035,"width":1036,"height":1037,"aspectRatio":228,"alt":753,"title":18,"bgColor":1038,"base64":1039},"https://www.datocms-assets.com/166020/1775135459-7313_vulncard.png?auto=compress&crop=focalpoint&dpr=0.25&fit=crop&w=1440 360w,https://www.datocms-assets.com/166020/1775135459-7313_vulncard.png?auto=compress&crop=focalpoint&dpr=0.5&fit=crop&w=1440 720w,https://www.datocms-assets.com/166020/1775135459-7313_vulncard.png?auto=compress&crop=focalpoint&dpr=0.75&fit=crop&w=1440 1080w,https://www.datocms-assets.com/166020/1775135459-7313_vulncard.png?auto=compress&crop=focalpoint&fit=crop&w=1440 1440w","https://www.datocms-assets.com/166020/1775135459-7313_vulncard.png?auto=compress&crop=focalpoint&dpr=0.25&fit=crop&fm=webp&w=1440 360w,https://www.datocms-assets.com/166020/1775135459-7313_vulncard.png?auto=compress&crop=focalpoint&dpr=0.5&fit=crop&fm=webp&w=1440 720w,https://www.datocms-assets.com/166020/1775135459-7313_vulncard.png?auto=compress&crop=focalpoint&dpr=0.75&fit=crop&fm=webp&w=1440 1080w,https://www.datocms-assets.com/166020/1775135459-7313_vulncard.png?auto=compress&crop=focalpoint&fit=crop&fm=webp&w=1440 1440w","(max-width: 1440px) 100vw, 1440px","https://www.datocms-assets.com/166020/1775135459-7313_vulncard.png?auto=compress&crop=focalpoint&fit=crop&w=1440",1440,720,"#61ba69","data:image/png;base64,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",1780067943970]