Might’s Patch Tuesday updates make pressing patching a should

This previous week’s Patch Tuesday began with 73 updates, however ended up (to this point) with three revisions and a late addition (CVE-2022-30138) for a complete of 77 vulnerabilities addressed this month. In contrast with the broad set of updates launched in April, we see a larger urgency in patching Home windows — particularly wiith three zero-days and several other very critical flaws in key server and authentication areas. Change would require consideration, too, attributable to new server update technology.

There have been no updates this month for Microsoft browsers and Adobe Reader. And Home windows 10 20H2 (we hardly knew ye) is now out of assist.

You’ll find extra info on the dangers of deploying these Patch Tuesday updates in this helpful infographic, and the MSRC Heart has posted a superb overview of the way it handles safety updates here.

Key testing eventualities

Given the massive variety of modifications included with this Might patch cycle, I’ve damaged down the testing eventualities into high-risk and standard-risk teams:

Excessive Danger: These modifications are more likely to embody performance modifications, might deprecate current capabilities and can doubtless require creating new testing plans:

  • Check your enterprise CA certificates (each new and renewed). Your area server KDC will robotically validate the brand new extensions included on this replace. Search for failed validations!
  • This replace features a change to driver signatures that now embody timestamp checking in addition to authenticode signatures. Signed drivers ought to load. Unsigned drivers shouldn’t. Verify your utility take a look at runs for failed driver masses. Embody checks for signed EXEs and DLLs too.

The next modifications are usually not documented as together with useful modifications, however will nonetheless require at the least “smoke testing” earlier than basic deployment of Might’s patches:

  • Check your VPN shoppers when utilizing RRAS servers: embody join, disconnect (utilizing all protocols: PPP/PPTP/SSTP/IKEv2).
  • Check that your EMF recordsdata open as anticipated.
  • Check your Home windows Handle Ebook (WAB) utility dependencies.
  • Check BitLocker: begin/cease your machines with BitLocker enabled after which disabled.
  • Validate that your credentials are accessible through VPN (see Microsoft Credential Manager).
  • Check your V4 printer drivers (particularly with the later arrival of CVE-2022-30138)

This month’s testing would require a number of reboots to your testing assets and will embody each (BIOS/UEFI) digital and bodily machines.

Identified points

Microsoft features a listing of recognized points that affectthe working system and platforms included on this replace cycle:

  • After putting in this month’s replace, Home windows units that use sure GPUs would possibly trigger apps to shut unexpectedly, or generate an exception code (0xc0000094 in module d3d9on12.dll) in apps utilizing Direct3D Model 9. Microsoft has revealed a KIR group coverage replace to resolve this challenge with the next GPO settings: Download for Windows 10, version 2004, Windows 10, version 20H2, Windows 10, version 21H1, and Windows 10, version 21H2.
  • After putting in updates launched Jan. 11, 2022 or later, apps that use the Microsoft .NET Framework to amass or set Energetic Listing Forest Belief Info would possibly fail or generate an entry violation (0xc0000005) error. It seems that purposes that depend upon the System.DirectoryServices API are affected.

Microsoft has actually upped its sport when discussing latest fixes and updates for this launch with a helpful update highlights video.

Main revisions

Although there’s a a lot lowered listing of patches this month in comparison with April, Microsoft has launched three revisions together with:

  • CVE-2022-1096: Chromium: CVE-2022-1096 Sort Confusion in V8. This March patch has been up to date to incorporate assist for the most recent model of Visible Studio (2022) to permit for the up to date rendering of webview2 content material. No additional motion is required.
  • CVE-2022-24513: Visible Studio Elevation of Privilege Vulnerability. This April patch has been up to date to incorporate ALL supported variations of Visible Studio (15.9 to 17.1). Sadly, this replace might require some utility testing to your improvement group, because it impacts how webview2 content material is rendered.
  • CVE-2022-30138: Home windows Print Spooler Elevation of Privilege Vulnerability. That is an informational change solely. No additional motion is required.

Mitigations and workarounds

For Might, Microsoft has revealed one key mitigation for a critical Home windows community file system vulnerability:

  • CVE-2022-26937: Home windows Community File System Distant Code Execution Vulnerability. You possibly can mitigate an assault by disabling NFSV2 and NFSV3. The next PowerShell command will disable these variations: “PS C:Set-NfsServerConfiguration -EnableNFSV2 $false -EnableNFSV3 $false.” As soon as carried out. you will have to restart your NFS server (or ideally reboot the machine). And to verify that the NFS server has been up to date accurately, use the PowerShell command “PS C:Get-NfsServerConfiguration.”

Every month, we break down the replace cycle into product households (as outlined by Microsoft) with the next primary groupings: 

  • Browsers (Microsoft IE and Edge);
  • Microsoft Home windows (each desktop and server);
  • Microsoft Workplace;
  • Microsoft Change;
  • Microsoft Growth platforms ( ASP.NET Core, .NET Core and Chakra Core);
  • Adobe (retired???, possibly subsequent yr).


Microsoft has not launched any updates to both its legacy (IE) or Chromium (Edge) browsers this month. We’re seeing a downward development of the variety of vital points which have plagued Microsoft for the previous decade. My feeling is that shifting to the Chromium undertaking has been a particular “tremendous plus-plus win-win” for each the event group and customers.

Talking of legacy browsers, we have to put together for the retirement of IE coming in the midst of June. By “put together” I imply rejoice — after, after all, we’ve got ensured that legacy apps wouldn’t have specific dependencies on the previous IE rendering engine. Please add “Rejoice the retirement of IE” to your browser deployment schedule. Your customers will perceive.

Home windows

The Home windows platform receives six vital updates this month and 56 patches rated necessary. Sadly, we’ve got three zero-day exploits, too:

  • CVE-2022-22713: This publicly disclosed vulnerability in Microsoft’s Hyper-V virtualization platform would require an attacker to efficiently exploit an inside race situation to result in a possible denial-of-service state of affairs. It is a critical vulnerability, however requires chaining a number of vulnerabilities to succeed.
  • CVE-2022-26925: Each publicly disclosed and reported as exploited within the wild, this LSA authentication issue is an actual concern. It will likely be straightforward to patch, however the testing profile is massive, making it a troublesome one to deploy shortly. Along with testing your area authentication, be certain that backups (and restore) capabilities are working as anticipated. We extremely suggest checking the most recent Microsoft support notes on this ongoing issue.
  • CVE-2022-29972: This publicly-disclosed vulnerability within the Redshift ODBC driver is fairly particular to Synapse purposes. However when you’ve got publicity to any of the Azure Synapse RBAC roles, deploying this replace is a prime precedence.

Along with these zero-day points, there are three different points that require your consideration:

  • CVE-2022-26923: this vulnerability in Energetic Listing authentication shouldn’t be fairly “wormable” however is very easy to take advantage of, I’d not be stunned to see it actively attacked quickly. As soon as compromised, this vulnerability will present entry to your complete area. The stakes are excessive with this one.
  • CVE-2022-26937: This Community File System bug has a score of 9.8 – one of many highest reported this yr. NFS shouldn’t be enabled by default, however when you’ve got Linux or Unix in your community, you’re doubtless utilizing it. Patch this challenge, however we additionally suggest upgrading to NFSv4.1 as quickly as doable.
  • CVE-2022-30138: This patch was launched post-Patch Tuesday. This print spooler challenge solely impacts older techniques (Home windows 8 and Server 2012) however would require important testing earlier than deployment. It is not an excellent vital safety challenge, however the potential for printer-based points is massive. Take your time earlier than deploying this one.

Given the variety of critical exploits and the three zero-days in Might, add this month’s Home windows replace to your “Patch Now” schedule.

Microsoft Workplace

Microsoft launched simply 4 updates for the Microsoft Workplace platform (Excel, SharePoint) all of that are rated necessary. All these updates are tough to take advantage of (requiring each consumer interplay and native entry to the goal system) and solely have an effect on 32-bit platforms. Add these low-profile, low-risk Workplace updates to your normal launch schedule.

Microsoft Change Server

Microsoft launched a single replace to Change Server (CVE-2022-21978) that’s rated necessary and seems fairly tough to take advantage of. This elevation-of-privilege vulnerability requires absolutely authenticated entry to the server, and to this point there haven’t been any studies of public disclosure or exploitation within the wild.

Extra importantly this month, Microsoft launched a brand new method to update Microsoft Exchange servers that now contains:

  • Home windows Installer patch file (.MSP), which works greatest for automated installations.
  • Self-extracting, auto-elevating installer (.exe), which works greatest for guide installations.

That is an try to resolve the issue of Change admins updating their server techniques inside a non-admin context, leading to a foul server state. The brand new EXE format permits for command line installations and higher set up logging. Microsoft has helpfully revealed the next EXE command line instance:

“Setup.exe /IAcceptExchangeServerLicenseTerms_DiagnosticDataON /PrepareAllDomains”

Word, Microsoft recommends that you’ve the %Temp% surroundings variable earlier than utilizing the brand new EXE set up format. For those who comply with the brand new technique of utilizing the EXE to replace Change, bear in mind you’ll nonetheless must (individually) deploy the month-to-month SSU replace to make sure your servers are updated. Add this replace (or EXE) to your normal launch schedule, guaranteeing {that a} full reboot is actioned when all updates are accomplished.

Microsoft improvement platforms

Microsoft has launched 5 updates rated necessary and a single patch with a low score. All these patches have an effect on Visible Studio and the .NET framework. As you’ll be updating your Visible Studio situations to deal with these reported vulnerabilities, we suggest that you just learn the Visual Studio April update guide.

To seek out out extra in regards to the particular points addressed from a safety perspective, the May 2022 .NET update blog posting shall be helpful. Noting that .NET 5.0 has now reached end of support and earlier than you improve to .NET 7, it could be price checking on a few of the compatibility or “breaking changes” that have to be addressed. Add these medium-risk updates to your normal replace schedule.

Adobe (actually simply Reader)

I assumed that we could be seeing a development. No Adobe Reader updates for this month. That stated, Adobe has launched plenty of updates to different merchandise discovered right here: APSB22-21. Let’s have a look at what occurs in June — possibly we will retire each Adobe Reader and IE.


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