Four zero-day exploits add urgency to October’s Patch Tuesday

    October brings 4 zero-day exploits and 74 updates to the Windows ecosystem, together with a hard-to-test kernel replace (CVE-2021-40449) that requires instant consideration and an Exchange Server replace that requires technical talent and due diligence (and a reboot). The testing profile for the October Patch Tuesday covers Windows error dealing with, AppX, Hyper-V and Microsoft Word. We suggest a Patch Now schedule for Windows after which staging the remaining patch teams based on your regular launch sample.You can discover extra info on the chance of deploying these Patch Tuesday updatesin this infographic.Key testing eventualitiesThere are not any reported high-risk adjustments to the Windows platform. However, there may be one reported purposeful change and an extra characteristic added:As all the time, affirm that printing performs as anticipated with bodily printers and digital printers. Verify there are not any points with printer drivers. We recommend an evaluation of which printer driver software program remains to be utilizing 32-bit code for software administration.
    Test your non-English web sites, in search of damaged or uneven characters in Thai, Lao, Korean, and Arabic.
    The Active Directory characteristic BanndIP has been up to date. We recommend validating AD authorization for each energetic and passive community visitors. You can discover out extra right here.
    Microsoft has up to date the media codec, so testing giant picture and video recordsdata needs to be a part of the testing plan.
    The STORPORT.SYS element was up to date this month, so verify functions that depend upon this Windows characteristic.
    I feel it’s now protected to say that the Microsoft AppX format was not as broadly adopted within the enterprise as anticipated. Even so, there have been vital upgrades to Microsoft AppX containers and deployment instruments included on this October replace. If you have got an enterprise Microsoft “store” on your functions, we suggest putting in/uninstalling each your AppX functions and their related runtimes.On the subject of lesser-used Windows options, the Microsoft NTFS file system was up to date to incorporate a repair for symbolic hyperlinks (useful with UNIX migrations). If you’re in the midst of a big UNIX migration, chances are you’ll need to pause issues a bit and check out some giant (and parallel) file transfers earlier than deploying this replace.Known pointsEach month, Microsoft features a listing of identified points that relate to the working system and platforms included within the  replace cycle. I’ve referenced a couple of key points that relate to the most recent builds from Microsoft, together with:Devices with Windows installations created from customized offline media or customized ISO pictures might need Microsoft Edge Legacy eliminated by this replace, however not mechanically changed by the brand new Microsoft Edge. This subject is just encountered when customized offline media or ISO pictures are created by slipstreaming this replace into the picture with out having first put in the standalone servicing stack replace (SSU) launched March 29, 2021 or later.
    Major revisionsAt the time of penning this for this July replace cycle, there have been two main updates to earlier launched updates:CVE-2021-38624: Windows Key Storage Provider Security Feature Bypass Vulnerability. This is Microsoft’s third attempt at patching this Windows key storage element, and sadly a significant improve was required. This month’s affected programs embody Windows 11; Microsoft strongly beneficial that instant motion be taken to replace programs.
    CVE-2021-33781: Azure AD Security Feature Bypass Vulnerability. Again, one other third attempt to resolve this subject. However, for this Azure AD subject, these newest adjustments are extra informational (correcting CVE titles and documentation) and embody an up to date affected system listing to incorporate Windows 11. No additional motion required right here.
    Mitigations and workaroundsCVE-2021-40444: Microsoft is investigating stories of a distant code execution vulnerability in MSHTML that impacts Windows. The firm is conscious of focused assaults that try to use this vulnerability through the use of specially-crafted Microsoft Office paperwork. An attacker might craft a malicious ActiveX management for use by a Microsoft Office doc that hosts the browser rendering engine.
    Each month, we break down the replace cycle into product households (as outlined by Microsoft) with the next fundamental groupings:Browsers (Microsoft IE and Edge);
    Microsoft Windows (each desktop and server);
    Microsoft Office;
    Microsoft Exchange;
    Microsoft Development platforms ( ASP.NET Core, .NET Core and Chakra Core);
    Adobe (retired???, not but).
    BrowsersMicrosoft printed 33 updates to the Chromium-based Edge browser this cycle. Given how Chromium doesn’t combine deeply into the desktop or server working system, potential collisions or dependency points are unlikely. You can discover out extra concerning the Chromium undertaking’s replace cycle andrelease notes right here. However one of many key parts (IEFRAME.DLL) of Internet Explorer (IE) was up to date this month. It is feasible that third-party functions and in-house developed software program could depend upon this key library. For this specific replace, It appears to be like as if Microsoft has modified how browsers tabs are dealt with, significantly how they’re created. If you obtain “Invalid Pointer Bad Ref Count” (or related) errors in your testing, it could very nicely be associated to this replace to the core Internet Explorer system libraries (DLL’s). Add each of those teams of browser updates to your common replace schedule.WindowsThis month, Microsoft printed 4 important updates for the Windows ecosystem and an extra 45 patches rated as essential. Unfortunately, replace CVE-2021-40449 for the Windows Kernel has been reported as exploited. This pairs a difficult-to-test, low-level replace to Windows core programs with an urgency to mitigate or patch. We have included testing steerage in a piece above that covers numerous this month’s Windows adjustments. However, testing kernel updates could be very powerful. Test your core apps completely, launch your updates in rings or levels, and add this replace to your Patch Now schedule.Microsoft OfficeMicrosoft launched 16 updates to Microsoft Office and Microsoft SharePoint, with one rated as important (CVE-2021-40486) affecting Microsoft Word and the remaining patches affecting Excel and SharePoint. The Word safety subject, whereas critical, has not been publicly disclosed and there are not any stories of exploits within the wild. Note: SharePoint would require a reboot after its replace. We suggest including these to your common patch launch schedule.Microsoft Exchange ServerUnfortunately, Microsoft Exchange Server updates are again for October. There are 4 patches for Exchange Server (each 2016 and 219), all rated as essential. However, CVE-2021-36970 has a base score of 9.0, based on the vulnerability score system CVSS. This is absolutely excessive (which means critical) and often would warrant a important score from Microsoft. However, because of the limitation of the “scope” of vulnerability, the potential harm is way lowered.Microsoft has printed up to date documentation detailing various identified points regarding this month’s Exchange Server patches the place a guide software of MSP recordsdata doesn’t accurately set up the entire needed recordsdata. In addition, misapplying this replace could go away your Exchange server in a disabled state. This subject applies to the next October updates:This set up subject is a selected concern when making use of updates utilizing User Account Control (UAC), and doesn’t occur whenever you use Microsoft Update. Otherwise, word that this Exchange replace would require a server reboot; we suggest including this replace to your common replace schedule.Microsoft Development PlatformsMicrosoft launched three updates to Visual Studio and one patch for .NET 5.0 this month. All had been rated as essential by Microsoft and at worst might result in info disclosure or “denial of service” (software particular and localized). The Visual Studio updates are very easy and needs to be included in your commonplace improvement launch cycle.Adobe (actually simply Reader)Adobe launched 4 updates to its core Reader product group with safety bulletin APSB1221-104. Two of those updates (CWE-416 and CWE-787) are rated as important by Adobe. While each of those have CVSS scores of 7.8 (which is fairly excessive for a PDF reader) they don’t require an pressing replace. Add these to your common replace schedule.

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