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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/166020/1755779435-vuln_7184_cve-2021-34484-patchcard_twitter_506x253.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":753},"og:image:alt","A Bug That Doesn't Want To Die (CVE-2021-34484,  CVE-2022-21919, CVE-2022-26904)",{"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","2025-09-09T13:15:26Z",{"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-incompletely-patched",[788],{"value":42,"locale":32},"2021-11-10T22:19:00+01:00","Mitja Kolsek","2025-08-21T14:34:23+02:00","I34bOn9qS8GSMnpZ15Krvg",{"blocks":794,"links":823,"value":824},[795,811],{"id":796,"_modelApiKey":797,"__typename":798,"image":799},"CFd7KfMwSwCMnxKRurt9vw","image","ImageRecord",{"alt":800,"url":801,"width":802,"height":803,"responsiveImage":804},"Our micropatch (green code blocks) injected in the original code of profext.dll.","https://www.datocms-assets.com/166020/1757423650-cve-2021-33742-micropatch.png",1808,861,{"srcSet":805,"webpSrcSet":806,"sizes":807,"src":801,"width":802,"height":803,"aspectRatio":808,"alt":800,"title":800,"bgColor":809,"base64":810},"https://www.datocms-assets.com/166020/1757423650-cve-2021-33742-micropatch.png?dpr=0.25 452w,https://www.datocms-assets.com/166020/1757423650-cve-2021-33742-micropatch.png?dpr=0.5 904w,https://www.datocms-assets.com/166020/1757423650-cve-2021-33742-micropatch.png?dpr=0.75 1356w,https://www.datocms-assets.com/166020/1757423650-cve-2021-33742-micropatch.png 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(0day)","https://i.ytimg.com/vi/mIpaxqKNhi0/hqdefault.jpg",113,"youtube","mIpaxqKNhi0",200,[],{"schema":825,"document":826},"dast",{"type":827,"children":828},"root",[829,837,844,868,899,903,908,912,916,920,933,937,940,944,957,960,962,965,969,970,973,979,986,1059,1109,1112,1116],{"type":830,"children":831},"paragraph",[832],{"type":833,"marks":834,"value":836},"span",[835],"emphasis","Update 12/21/2021: December Windows Updates did not bring a fix for this 0day. Our associated micropatches thus remain free.",{"type":830,"children":838},[839,842],{"type":833,"marks":840,"value":841},[835],"Update 1/12/2022: January 2022 Windows Updates brought a fix for this issue. Our associated micropatches are now part of the PRO plan.",{"type":833,"value":843},"\n",{"type":830,"children":845},[846,848,857,859,866],{"type":833,"value":847},"August 2021 Windows Updates brought a ",{"url":849,"meta":850,"type":12,"children":854},"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34484",[851],{"id":852,"value":853},"target","_blank",[855],{"type":833,"value":856},"fix for CVE-2021-34484",{"type":833,"value":858},", found and reported by security researcher ",{"url":860,"meta":861,"type":12,"children":863},"https://twitter.com/KLINIX5",[862],{"id":852,"value":853},[864],{"type":833,"value":865},"Abdelhamid Naceri",{"type":833,"value":867},". This vulnerability was considered by Microsoft to be an \"arbitrary directory deletion\" bug, allowing a locally logged-on attacker to delete a folder on the computer. This, combined with the fact that the attacker must also have credentials of another user who can locally log on to the same computer, made the bug seem fairly uninteresting.",{"type":830,"children":869},[870,872,879,881,888,890,897],{"type":833,"value":871},"However, Abdelhamid subsequently reviewed Microsotf's fix and ",{"url":873,"meta":874,"type":12,"children":876},"https://twitter.com/KLINIX5/status/1451558296872173577",[875],{"id":852,"value":853},[877],{"type":833,"value":878},"found it to be incomplete",{"type":833,"value":880},", bypassable with a small change to the attack script. Furthermore, he confirmed the vulnerability was more impactful than described in Microsoft's advisory, namely enabling local privilege escalation from a regular user to System. Consequently, a ",{"url":882,"meta":883,"type":12,"children":885},"https://github.com/klinix5/ProfSvcLPE/blob/main/write-up.docx",[884],{"id":852,"value":853},[886],{"type":833,"value":887},"write-up",{"type":833,"value":889}," and ",{"url":891,"meta":892,"type":12,"children":894},"https://github.com/klinix5/ProfSvcLPE/tree/main/DoubleJunctionEoP",[893],{"id":852,"value":853},[895],{"type":833,"value":896},"proof of concept",{"type":833,"value":898}," were published, which allowed us to analyze the vulnerability and create a micropatch for it. ",{"type":830,"children":900},[901],{"type":833,"value":902}," ",{"type":904,"level":522,"children":905},"heading",[906],{"type":833,"value":907},"The Vulnerability",{"type":830,"children":909},[910],{"type":833,"value":911},"The vulnerability lies in the User Profile Service, specifically in the code responsible for creating a temporary user profile folder in case the user's original profile folder is damaged or locked for some reason. Abdelhamid found that the process (executed as Local System) of copying folders and files from user's original profile folder to the temporary one can be attacked with symbolic links to create attacker-writable folders in a system location from which a subsequently launched system process would load and execute attacker's DLL.",{"type":830,"children":913},[914],{"type":833,"value":915},"The crux of the attack is in quickly creating a symbolic link in the temporary user profile folder (C:\\Users\\TEMP) so that when the User Profile Service copies a folder from user's original profile folder, it will end up creating a folder somewhere else - where the attacker would normally not have permissions to create one.",{"type":830,"children":917},[918],{"type":833,"value":919},"Microsoft, even though believing the vulnerability only allowed for deletion of an arbitrarily \"symlinked\" folder, made a conceptually correct fix: it checked whether the destination folder under C:\\Users\\TEMP was a symbolic link, and aborted the operation if so. The incompleteness of this fix, as noticed by Abdelhamid, was in the fact that the symbolic link need not be in the upper-most folder (which Microsoft's fix checked), but in any folder along the destination path.",{"type":830,"children":921},[922,924,931],{"type":833,"value":923},"Admittedly, this bug was not easy to reproduce, as it requires winning a race condition and that depends on lots of factors. Nevertheless, an actual attacker would have an unlimited number of attempts and would not be dismayed by that. A more significant obstacle for them would be obtaining additional user's credentials, which seem to be needed in order to exploit this vulnerability. As stated by Abdelhamid, \"",{"url":925,"meta":926,"type":12,"children":928},"https://halove23.blogspot.com/2021/10/windows-user-profile-service-0day.html",[927],{"id":852,"value":853},[929],{"type":833,"value":930},"it might be possible to do it without knowing someone else password.",{"type":833,"value":932},"\" but until someone finds a way to do so, we shall assume this to be a requirement.",{"type":830,"children":934},[935],{"type":833,"value":936},"While this vulnerability already has its CVE ID (CVE-2021-33742), we're considering it to be without an official vendor fix and therefore a \"0day\".",{"type":830,"children":938},[939],{"type":833,"value":843},{"type":904,"level":522,"children":941},[942],{"type":833,"value":943},"Our Micropatch\n",{"type":830,"children":945},[946,948,955],{"type":833,"value":947},"Our micropatch extends the incomplete security check from Microsoft's fix to the entire destination path by calling ",{"url":949,"meta":950,"type":12,"children":952},"https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-getfinalpathnamebyhandlew",[951],{"id":852,"value":853},[953],{"type":833,"value":954},"GetFinalPathNameByHandle",{"type":833,"value":956}," and thus resolving any symbolic links it may contain. Then, by comparing the original path and the \"resolved\" path, it determines whether any symbolic links are present; if not, original code execution is resumed, otherwise the creation of a temporary user profile is aborted.",{"type":830,"children":958},[959],{"type":833,"value":902},{"item":796,"type":961},"block",{"type":830,"children":963},[964],{"type":833,"value":40},{"type":830,"children":966},[967],{"type":833,"value":968},"And the video of our micropatch in action. Without the micropatch, exploit works; with the micropatch, corrected code in User Profile Service determines that a destination path contains a symbolic link and aborts the creation of a temporary profile folder.\n",{"item":812,"type":961},{"type":830,"children":971},[972],{"type":833,"value":843},{"type":830,"children":974},[975,978],{"type":833,"marks":976,"value":977},[835],"[Update 11/16/2021: The list below updated with additional supported platforms]",{"type":833,"value":843},{"type":830,"children":980},[981,983],{"type":833,"value":982},"This micropatch was written for:",{"type":833,"marks":984,"value":902},[985],"strong",{"type":987,"style":988,"children":989},"list","numbered",[990,1000,1008,1016,1024,1032,1041,1050],{"type":991,"children":992},"listItem",[993],{"type":830,"children":994},[995,998],{"type":833,"marks":996,"value":997},[985],"Windows 10 v21H1 (32 & 64 bit) ",{"type":833,"value":999},"updated with October or November 2021 Updates",{"type":991,"children":1001},[1002],{"type":830,"children":1003},[1004,1007],{"type":833,"marks":1005,"value":1006},[985],"Windows 10 v20H2 (32 & 64 bit) ",{"type":833,"value":999},{"type":991,"children":1009},[1010],{"type":830,"children":1011},[1012,1015],{"type":833,"marks":1013,"value":1014},[985],"Windows 10 v2004 (32 & 64 bit) ",{"type":833,"value":999},{"type":991,"children":1017},[1018],{"type":830,"children":1019},[1020,1023],{"type":833,"marks":1021,"value":1022},[985],"Windows 10 v1909 (32 & 64 bit) ",{"type":833,"value":999},{"type":991,"children":1025},[1026],{"type":830,"children":1027},[1028,1031],{"type":833,"marks":1029,"value":1030},[985],"Windows 10 v1903 (32 & 64 bit) ",{"type":833,"value":999},{"type":991,"children":1033},[1034],{"type":830,"children":1035},[1036,1039],{"type":833,"marks":1037,"value":1038},[985],"Windows 10 v1809 (32 & 64 bit) ",{"type":833,"value":1040},"updated with May 2021 Updates",{"type":991,"children":1042},[1043],{"type":830,"children":1044},[1045,1048],{"type":833,"marks":1046,"value":1047},[985],"Windows Server 2019 64 bit",{"type":833,"value":1049}," updated with October or November 2021 Updates",{"type":991,"children":1051},[1052],{"type":830,"children":1053},[1054,1057],{"type":833,"marks":1055,"value":1056},[985],"Windows Server 2016 64 bit",{"type":833,"value":1058}," updated with November 2021 Updates\n",{"type":830,"children":1060},[1061,1063,1073,1075,1083,1085,1090,1092,1099,1101,1107],{"type":833,"value":1062},"While some older Windows versions also seem to be theoretically affected, the vulnerable code is different there, making the window for winning the race condition extremely narrow and probably unexploitable.\n  Micropatches for this vulnerability will be free until Microsoft has issued an official fix. If you want to use them, create a free account in ",{"url":1064,"meta":1065,"type":12,"children":1070},"https://central.0patch.com",[1066,1069],{"id":1067,"value":1068},"rel","url noopener noreferrer",{"id":852,"value":853},[1071],{"type":833,"value":1072},"0patch Central",{"type":833,"value":1074},", then install and register 0patch Agent from ",{"url":1076,"meta":1077,"type":12,"children":1080},"https://t.co/UMXoQqpLQh",[1078,1079],{"id":1067,"value":1068},{"id":852,"value":853},[1081],{"type":833,"value":1082},"0patch.com",{"type":833,"value":1084},". Everything else will happen automatically. No computer reboots will be needed.\n \nWe'd like to thank ",{"url":860,"meta":1086,"type":12,"children":1088},[1087],{"id":852,"value":853},[1089],{"type":833,"value":865},{"type":833,"value":1091}," for finding this issue and sharing details, which allowed us to create a micropatch and protect our users. Thanks also to ",{"url":1093,"meta":1094,"type":12,"children":1096},"https://twitter.com/wdormann",[1095],{"id":852,"value":853},[1097],{"type":833,"value":1098},"Will Dormann",{"type":833,"value":1100}," for useful tips on reproducing this issue.\n\nTo learn more about 0patch, please visit our ",{"url":1102,"meta":1103,"type":12,"children":1105},"https://0patch.zendesk.com/hc/en-us",[1104],{"id":852,"value":853},[1106],{"type":833,"value":97},{"type":833,"value":1108},".",{"type":830,"children":1110},[1111],{"type":833,"value":843},{"type":830,"children":1113},[1114],{"type":833,"value":1115}," \n",{"type":830,"children":1117},[1118],{"type":833,"value":902},{"alt":753,"url":1120,"width":1121,"height":1122,"responsiveImage":1123},"https://www.datocms-assets.com/166020/1755779435-vuln_7184_cve-2021-34484-patchcard_twitter_506x253.png",640,320,{"srcSet":1124,"webpSrcSet":1125,"sizes":1126,"src":1127,"width":1128,"height":1129,"aspectRatio":228,"alt":753,"title":753,"bgColor":1130,"base64":1131},"https://www.datocms-assets.com/166020/1755779435-vuln_7184_cve-2021-34484-patchcard_twitter_506x253.png?auto=compress&crop=focalpoint&dpr=0.25&fit=crop&w=1440 360w,https://www.datocms-assets.com/166020/1755779435-vuln_7184_cve-2021-34484-patchcard_twitter_506x253.png?auto=compress&crop=focalpoint&fit=crop&w=1440 1440w","https://www.datocms-assets.com/166020/1755779435-vuln_7184_cve-2021-34484-patchcard_twitter_506x253.png?auto=compress&crop=focalpoint&dpr=0.25&fit=crop&fm=webp&w=1440 360w,https://www.datocms-assets.com/166020/1755779435-vuln_7184_cve-2021-34484-patchcard_twitter_506x253.png?auto=compress&crop=focalpoint&fit=crop&fm=webp&w=1440 1440w","(max-width: 1440px) 100vw, 1440px","https://www.datocms-assets.com/166020/1755779435-vuln_7184_cve-2021-34484-patchcard_twitter_506x253.png?auto=compress&crop=focalpoint&fit=crop&w=1440",1440,720,"#bf4da8","data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wCEAAoHBwgHBgoICAgLDhYSEBIQDg4NEBEJDhEOFx8ZGBYfFhUaHysjGh0oHRUWJDUlKC0vMjIyGSI4PTcwPCsxMi8BCgsLDg0OHAoMHC8dFhw1Ly8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vL//AABEIAAwAGAMBIgACEQEDEQH/xAAYAAACAwAAAAAAAAAAAAAAAAABBQMEBv/EABwQAAICAwEBAAAAAAAAAAAAAAECAAQDITEyEv/EABUBAQEAAAAAAAAAAAAAAAAAAAQC/8QAGREAAgMBAAAAAAAAAAAAAAAAABEBAjEh/9oADAMBAAIRAxEAPwDT0KiFdmMjQxHH2KKeRgvZdOZ/n1E2bAUnhHdqoiaghtsTh2YJUNETp//Z",1780067954270]