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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":783,"_allPublishTranslationLocales":786,"published":788,"__typename":683,"_modelApiKey":77,"author":789,"createdAt":790,"id":791,"excerpt":40,"body":792,"image":1029,"readTime":40,"title":720,"slug":785,"publishTranslation":42,"seoMetadata":18},"2025-08-21T14:20:00+02:00","2026-05-29T15:13:05+02:00","2026-05-29T15:13:03+02:00",[718,721,725,728,732,735,738,742,746,750,753,756,759,762,765,768,772,775,779],{"tag":719,"attributes":18,"content":720},"title","0patching Foxit Reader's saveAs \"0day\" (CVE-2017-10952)",{"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/166020/1755778792-saveas_logic.png?auto=format&fit=max&w=1200",{"tag":722,"attributes":743,"content":18},{"property":744,"content":745},"og:image:width","420",{"tag":722,"attributes":747,"content":18},{"property":748,"content":749},"og:image:height","640",{"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","2026-05-29T13:13:03Z",{"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},"0patching-foxit-readers-saveas-0day-cve",[787],{"value":42,"locale":32},"2017-08-24T15:41:00+02:00","Mitja Kolsek","2025-08-21T14:19:59+02:00","WS0ZXAeJS_SFp1sKS1j9oA",{"blocks":793,"links":821,"value":822},[794,809],{"id":795,"_modelApiKey":796,"__typename":797,"image":798},"ZE1L3a-vSMeOeQur7gB11w","image","ImageRecord",{"alt":720,"url":799,"width":800,"height":801,"responsiveImage":802},"https://www.datocms-assets.com/166020/1755778792-saveas_logic.png",420,640,{"srcSet":803,"webpSrcSet":804,"sizes":805,"src":799,"width":800,"height":801,"aspectRatio":806,"alt":720,"title":720,"bgColor":807,"base64":808},"https://www.datocms-assets.com/166020/1755778792-saveas_logic.png?dpr=0.25 105w,https://www.datocms-assets.com/166020/1755778792-saveas_logic.png?dpr=0.5 210w,https://www.datocms-assets.com/166020/1755778792-saveas_logic.png?dpr=0.75 315w,https://www.datocms-assets.com/166020/1755778792-saveas_logic.png 420w","https://www.datocms-assets.com/166020/1755778792-saveas_logic.png?dpr=0.25&fm=webp 105w,https://www.datocms-assets.com/166020/1755778792-saveas_logic.png?dpr=0.5&fm=webp 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CVE-2017-10952","https://i.ytimg.com/vi/WsdElJ-_Bt4/hqdefault.jpg",113,"youtube","WsdElJ-_Bt4",200,[],{"schema":823,"document":824},"dast",{"type":825,"children":826},"root",[827,942,944,990,991],{"type":828,"children":829},"paragraph",[830,835,837,841,843,852,854,861,863,870,872,875,877,884,886,893,895,902,904,911,913,916,918,921,923,926,928,931,933,940],{"type":831,"marks":832,"value":834},"span",[833],"strong","3rd-Party Patching a Logical Bug",{"type":831,"value":836},"\n\n\nA bit of introduction: last week we could all witness a familiar ",{"type":831,"marks":838,"value":840},[839],"emphasis","\"It's a vuln - no it's not\"",{"type":831,"value":842}," dance, this time featuring ",{"url":844,"meta":845,"type":12,"children":849},"http://www.zerodayinitiative.com/",[846],{"id":847,"value":848},"target","_blank",[850],{"type":831,"value":851},"Zero Day Initiative",{"type":831,"value":853}," and ",{"url":855,"meta":856,"type":12,"children":858},"https://www.foxitsoftware.com/",[857],{"id":847,"value":848},[859],{"type":831,"value":860},"Foxit Software",{"type":831,"value":862},". In short, ZDI reported to Foxit two security issues in its Reader and PhantomPDF products discovered by ",{"url":864,"meta":865,"type":12,"children":867},"https://twitter.com/steventseeley",[866],{"id":847,"value":848},[868],{"type":831,"value":869},"Steven Seeley",{"type":831,"value":871}," and Ariele Caltabiano. Foxit said they would not fix these issues as their exploitation requires the user to disable ",{"type":831,"marks":873,"value":874},[839],"Secure Mode",{"type":831,"value":876}," and thus allow unsafe JavaScript code to execute. ZDI then moved to publish ",{"url":878,"meta":879,"type":12,"children":881},"https://www.zerodayinitiative.com/blog/2017/8/17/busting-myths-in-foxit-reader",[880],{"id":847,"value":848},[882],{"type":831,"value":883},"proof-of-concept details",{"type":831,"value":885},", which resulted in ",{"url":887,"meta":888,"type":12,"children":890},"https://www.foxitsoftware.com/support/security-advisories.php",[889],{"id":847,"value":848},[891],{"type":831,"value":892},"Foxit deciding to address these issues",{"type":831,"value":894}," anyway. Finally, ",{"url":896,"meta":897,"type":12,"children":899},"https://twitter.com/insertScript",[898],{"id":847,"value":848},[900],{"type":831,"value":901},"Alex Inführ",{"type":831,"value":903}," reminded us that he also found an reported ",{"url":905,"meta":906,"type":12,"children":908},"http://insert-script.blogspot.si/2017/08/a-tale-about-foxit-reader-safe-reading.html",[907],{"id":847,"value":848},[909],{"type":831,"value":910},"two similar issues",{"type":831,"value":912}," to Foxit before.\n\nFoxit stated that they would \"",{"type":831,"marks":914,"value":915},[839],"add an additional guard in PhantomPDF/Reader code where when opening a PDF document contains these powerful ( and thus potentially insecure) JavaScript functions, the software will check if the document is digitally signed by a verifiable/trustworthy person of entity. Only certified documents can run these powerful JS functions even when “Safe Reading Mode” is turned off.",{"type":831,"value":917},"\"\n\nThey also announced their plan to \"",{"type":831,"marks":919,"value":920},[839],"release a Reader/PhantomPDF 8.3.2 patch update this week (ETA Aug 25th) with additional guard against misuse of powerful (potentially insecure) JavaScript functions — this will make Foxit software equivalent to what Adobe does.",{"type":831,"value":922},"\"\n\nWe at 0patch like a challenge as much as the next guy. While we're usually patching memory corruption bugs (most critical remotely exploitable vulns are of that sort), we're happy to demonstrate that in-memory micrpatching can just as well be used for fixing logical bugs - at least temporarily, until the official vendor fix is applied.\n\nSo we set upon creating a micropatch for CVE-2017-10952, allowing a script inside a PDF document to use the saveAs function to save itself to an arbitrarily chosen location on user's computer, using an arbitrarily chosen file extension. For example, a PDF document containing a \u003Chtml> block with some script anywhere in it could simply save itself as an HTA file (locally executable HTML file) in user's StartUp folder like this:\n\nthis.saveAs(\"/c/Users/”+ identity.loginName + ”/AppData/Roaming/Microsoft/Windows/STARTM~1/Programs/Startup/si.hta\");\n\nAs a result, when the user logged in to Windows the next time, this HTA file would get executed.\n\n\n",{"type":831,"marks":924,"value":925},[833],"Reproducing the issue",{"type":831,"value":927},"\n\n\nReproducing the issue was simple: we downloaded and installed the latest version of Foxit Reader (8.3.1.21155) and put the above code into a sample PDF file to get our POC.\n\nOpening the POC in Foxit Reader with default/recommended configuration resulted in the Safe Reading Mode warning. Pressing \"OK\" was enough to disable Safe Reading Mode and get our code executed. Indeed, si.hta got created in the StartUp folder.\n\n\n",{"type":831,"marks":929,"value":930},[833],"Analysis",{"type":831,"value":932},"\n\nIt's generally not trivial to find code that implements a JavaScript function, especially if the result of the POC is not a crash. However, in this case the saveAs function writes a file to disk so it can be intercepted at a call to one of the disk-writing Windows API functions. While the ZDI article mentions the WriteFile function, putting a breakpoint on it resulted in way too many hits. So we went with CreateFile.\n\nHowever, CreateFile also got called constantly with some BMP file that Foxit Reader seems to be loading all the time for some reason. Making the breakpoint conditional did the trick by simply checking two letters of the file path and not breaking if they matched the said BMP file path:\n\nbp kernel32!CreateFileW \"j poi(poi(esp+4)+6)!=0x00730055 ''; 'gc'\"\n\nBingo! The first break occurred right in our saveAs call, confirmed by our HTA path being passed to CreateFile. The call stack tail looked like this:\n\n\n0030eba8 01703c5e kernel32!CreateFileW\n0030ebdc 016f7d4f FOXITREADER+0x823c5e\n0030ebfc 011c5a22 FOXITREADER+0x817d4f\n0030efac 010bd155 FOXITREADER+0x2e5a22\n0030f068 0238ad23 FOXITREADER+0x1dd155\n0030f230 02377492 FOXITREADER+0x14aad23\n0030f2e4 012f17c7 FOXITREADER+0x1497492\n0030f31c 0217568e FOXITREADER+0x4117c7\n\n\nTime for IDA. As FOXITREADER.EXE is a 54MB beast, it took IDA quite a while to sort it all out. After that, looking at the functions in the call stack revealed that the one containing address FOXITREADER+0x14aad23 holds the bulk of saveAs implementation. There are references to all ",{"url":934,"meta":935,"type":12,"children":937},"http://help.adobe.com/livedocs/acrobat_sdk/11/Acrobat11_HTMLHelp/wwhelp/wwhimpl/common/html/wwhelp.htm?context=Acrobat11_HTMLHelp&file=JS_API_AcroJS.89.530.html",[936],{"id":847,"value":848},[938],{"type":831,"value":939},"saveAs",{"type":831,"value":941}," arguments there (cPath, cConvID, cFS, bCopy and bPromptToOverwrite), and one can see the logic of  bPromptToOverwrite value, which, if true, calls PathFileExistsW and sets a local variable we called allowed_to_save_file to 0 if the user declines the overwrite.\n\nThe image below shows the place where allowed_to_save_file is set to 0, and a bit further down where allowed_to_save_file is checked, whereby a bunch of code is bypassed if it is 0. The bypassed code includes the green block where the execution proceeds towards the CreateFile call.\n\n\n\n\n\n\n",{"item":795,"type":943},"block",{"type":828,"children":945},[946,949,951,956,958,961,963,966,967,970,971,974,975,978,980,984,985,988],{"type":831,"marks":947,"value":948},[833],"Patching",{"type":831,"value":950},"\n\nIt would be very difficult for us to do exactly what Foxit is about to do to address this issue (only allowing properly signed documents to use dangerous functions like saveAs) because digging down deeper to find a way to the data on document signatures could easily take us days. So we decided to simplify the fix in a way to still allow saveAs, but not in a RCE-style dangerous way.  \n\nWe noticed (and tested) that in contrast to Adobe's products, Foxit Reader's ",{"url":934,"meta":952,"type":12,"children":954},[953],{"id":847,"value":848},[955],{"type":831,"value":939},{"type":831,"value":957}," function doesn't seem to support document conversion. Consequently, it makes no sense to allow a document to save itself with any other extension than \".pdf\". So our logic would be to check the file name passed to saveAs, and only allow files with a \".pdf\" extension to proceed, while silently blocking all other extensions.\n\nHaving this patching logic in place, we already knew how to get the file path in the function shown above, so we only needed a way to sabotage the file creation for disallowed extensions without causing any unwanted side effects.\n\nThe implementation of bPromptToOverwrite logic came in handy as we saw that when the user doesn't allow overwriting, the execution simply bypasses a code block that otherwise leads to CreateFile, and that surely has no unwanted side effects.\n\nSo we did a similar thing: We decided to inject our patch code at the beginning of the green block and do the following there:\n\n",{"type":831,"marks":959,"value":960},[839],"1) Get the address of the last \".\" in cPath_string (if any).",{"type":831,"value":962},"\n",{"type":831,"marks":964,"value":965},[839],"2) If no dot, jump out of the block",{"type":831,"value":962},{"type":831,"marks":968,"value":969},[839],"3) Make a case-insensitive _wcsicmp with \".pdf\"",{"type":831,"value":962},{"type":831,"marks":972,"value":973},[839],"4) If we don't have a match, jump out of the block ",{"type":831,"value":962},{"type":831,"marks":976,"value":977},[839],"5) Otherwise continue",{"type":831,"value":979},"\n\nIDA was really helpful in identifying implementations of _wcsrchr and _wcsicmp inside FOXITREADER.EXE for us so we didn't have to implement them in the patch.\n\nFurthermore, we decided to identify any attempt to save a file with some other file extension as an exploit attempt, which results in an \"Exploit Attempt Blocked\" popup.\n\nThis is the micropatch that came out of this:\n\n\n",{"type":831,"marks":981,"value":983},[982],"code","; target: Foxit Reader 8.3.1.21155\nMODULE_PATH \"C:\\Program Files (x86)\\Foxit Software\\Foxit Reader\\FoxitReader.exe\"\nPATCH_ID 275\nPATCH_FORMAT_VER 2\nVULN_ID 2891\nPLATFORM win32\n\npatchlet_start\nPATCHLET_ID 1\nPATCHLET_TYPE 2\n\nPIT FoxitReader.exe!0x5CA2A1,FoxitReader.exe!0x5C9A22,FoxitReader.exe!0x14AAD23\n\nPATCHLET_OFFSET 0x14AACF2\nN_ORIGINALBYTES 5\n\ncode_start\n\n    mov edx, dword [ebp-1A0h]\n    push '.'\n    push edx\n    call PIT_0x5CA2A1           ; (_wcsrchr) find the last dot in cPath\n    add esp, 8                  ; restore esp\n    test eax, eax               ; was a dot found?\n    jz Abort                    ; no dot found, we don't allow that\n  \n    call GetLocalPdfString      ; a trick to get the address of a local\n                                ; string on stack\n    dw __utf16__(\".pdf\"),0\n\n    GetLocalPdfString:          ; at this point, the address of string\n                                ; \".pdf\" is on the stack\n    push eax                    ; eax points to the found dot in cPath\n    call PIT_0x5C9A22           ; (_wcsicmp) compare the two strings,\n                                ; case insensitive\n    add esp, 8                  ; restore esp\n    test eax, eax               ; do strings match?\n    jz Continue                 ; they do match, we allow saveAs to continue\n  \n    Abort:\n    call PIT_ExploitBlocked     ; show the \"Exploit Blocked\" popup\n    jmp PIT_0x14AAD23           ; jmp out of the block, sabotaging saveAs\n  \n    Continue:\n\ncode_end\npatchlet_end\n",{"type":831,"value":962},{"type":831,"marks":986,"value":987},[833],"Micropatch in Action",{"type":831,"value":989},"\n\n\nWe made a video to quickly show you how 0patch Agent applies this micropatch to a running Foxit Reader, effectively patching it without disturbing the user.\n\n\n\n\n",{"item":810,"type":943},{"type":828,"children":992},[993,996,998,1004,1006,1011,1013,1020,1021,1027],{"type":831,"marks":994,"value":995},[833],"Closing Remarks",{"type":831,"value":997},"\n\nWe made this micropatch to show how logical vulnerabilities can also be patched, and to demonstrate the amount of effort required for creating a micropatch. It took us 6 man-hours from installing the vulnerable Foxit Reader to having a working micropatch. Mind you, the majority of time was spent on analyzing the vulnerability and Reader's code, and deciding on a good way to patch. The original product developers already know the product inside out and would skip most of this process.\n\nWe believe that with Foxit's intimate knowledge of their product, and our knowledge of micropatching, a high-quality micropatch could be made in less than an hour. With our distribution system, it would be on everyone's computer within another hour, and applied automatically. Even users using Foxit Reader at that time would not notice anything - Reader would instantly get from \"vulnerable\" to \"fixed\" while they would scroll the pages of some document. And that's how we believe most software vulnerabilities should (and could) be fixed.\n\nIf you have ",{"url":55,"meta":999,"type":12,"children":1001},[1000],{"id":847,"value":848},[1002],{"type":831,"value":1003},"0patch Agent",{"type":831,"value":1005}," installed (it's free!), this micropatch is already on your computer and is getting automatically applied when you launch the vulnerable Foxit Reader. You can use this POC to play with it. Have fun, write some micropatches and if you're a software vendor interested in equipping your products with self-micropatching ability, ping us at ",{"url":1007,"type":12,"children":1008},"mailto:support@0patch.com",[1009],{"type":831,"value":1010},"support@0patch.com",{"type":831,"value":1012},".\n\n",{"url":1014,"meta":1015,"type":12,"children":1017},"https://twitter.com/mkolsek",[1016],{"id":847,"value":848},[1018],{"type":831,"value":1019},"@mkolsek",{"type":831,"value":962},{"url":699,"meta":1022,"type":12,"children":1024},[1023],{"id":847,"value":848},[1025],{"type":831,"value":1026},"@0patch",{"type":831,"value":1028},"\n\nUpdate 8/29/2017: The latest Foxit Reader (8.3.2.25013) fixes CVE-2017-10951, CVE-2017-10952, and both vulnerabilities reported by Alex Inführ.\n\n\n",{"alt":720,"url":799,"width":800,"height":801,"responsiveImage":1030},{"srcSet":1031,"webpSrcSet":1032,"sizes":1033,"src":1034,"width":1035,"height":1036,"aspectRatio":1037,"alt":720,"title":720,"bgColor":807,"base64":1038},"https://www.datocms-assets.com/166020/1755778792-saveas_logic.png?auto=compress&crop=focalpoint&dpr=0.25&fit=crop&w=1440 360w,https://www.datocms-assets.com/166020/1755778792-saveas_logic.png?auto=compress&crop=focalpoint&fit=crop&w=1440 1440w","https://www.datocms-assets.com/166020/1755778792-saveas_logic.png?auto=compress&crop=focalpoint&dpr=0.25&fit=crop&fm=webp&w=1440 360w,https://www.datocms-assets.com/166020/1755778792-saveas_logic.png?auto=compress&crop=focalpoint&fit=crop&fm=webp&w=1440 1440w","(max-width: 1440px) 100vw, 1440px","https://www.datocms-assets.com/166020/1755778792-saveas_logic.png?auto=compress&crop=focalpoint&fit=crop&w=1440",1440,2194,0.6563354603463992,"data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wCEAAoHBwgHBgoUCAgLCgoNFRUWDQ0ZDhkPFhEYFxUZGBYfIhUmHysjJh0oHSEWJDUlKC0vMjIyGSI4PTcwPCsxMi8BCgsLDg0OHBAOHDsoIig7LzsvLy87Ly8vLy8vOy8vLy8vLy87Ly8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vLy8vL//AABEIABkAEAMBIgACEQEDEQH/xAAYAAACAwAAAAAAAAAAAAAAAAACAwQFB//EAB0QAAEEAgMAAAAAAAAAAAAAAAEAAgMiBCERMTL/xAAWAQEBAQAAAAAAAAAAAAAAAAADBAH/xAAaEQACAgMAAAAAAAAAAAAAAAAAESEiARIT/9oADAMBAAIRAxEAPwDW5RwdJjDy3aXIQ11iiYQ4VKx3Qe0lXmwZT5KlOw4ciMWKmzekTOlPh9AVJ//Z",1780067940339]