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Microsoft has resolved 80 new CVEs this month along with 4 earlier CVEs, bringing the variety of safety points addressed on this month’s Patch Tuesday launch to 84.
Sadly, we’ve got two zero-day flaws in Outlook (CVE-2023-23397) and Home windows (CVE-2023-24880) that require a “Patch Now” launch requirement for each Home windows and Microsoft Workplace updates. Because it was final month, there have been no additional updates for Microsoft Trade Server or Adobe Reader. This month the workforce at Software Readiness has supplied a useful infographic that outlines the dangers related to every of the updates for this cycle.
Recognized points
Every month, Microsoft features a listing of identified points that relate to the working system and platforms included within the replace cycle.
- KB5022842: After putting in KB5022842 on Home windows Server 2022 with Safe Boot enabled and rebooting twice, the VMware VM did not boot utilizing the brand new bootmgr. This challenge continues to be into account by Microsoft. After putting in this replace, WPF apps could have a change in conduct.
- After putting in this month’s Home windows replace on visitor digital machines (VMs) operating Home windows Server 2022 on some variations of VMware ESXi, Home windows Server 2022 won’t begin.
Microsoft continues to be engaged on a community efficiency challenge with Home windows 11 22H2. Massive (multi-gigabyte) community file transfers (and doubtlessly equally massive native transfers) are affected. This challenge ought to primarily have an effect on IT directors.
Main revisions
Microsoft revealed 4 main revisions this month protecting:
- VE-2023-2156: Microsoft SQL Server Integration Service (VS extension) Distant Code Execution Vulnerability.
- CVE-2022-41099: Title: BitLocker Safety Function Bypass Vulnerability.
- CVE-2023-21716: Microsoft Phrase Distant Code Execution Vulnerability.
- CVE-2023-21808 .NET and Visible Studio Distant Code Execution Vulnerability.
All of those revisions had been attributable to documentation and expanded affected software program updates. No additional motion is required.
Mitigations and workarounds
Microsoft revealed the next vulnerability associated mitigations for this month’s launch:
- CVE-2023-23392: HTTP Protocol Stack Distant Code Execution Vulnerability. A prerequisite for a Home windows 2022 server to be weak to this safety challenge is that the community binding has HTTP/3 enabled and the server makes use of buffered I/O. Enabling HTTP/3 is mentioned right here: Enabling HTTP/3 assist on Home windows Server 2022.
- CVE-2023-23397: Microsoft Outlook Elevation of Privilege Vulnerability. Microsoft has revealed two mitigations for this critical safety challenge:
- Add customers to the Protected Customers Safety Group, which prevents the usage of NTLM as an authentication mechanism.
- Block TCP 445/SMB outbound out of your community by utilizing a fringe firewall, an area firewall, and by way of your VPN settings.
Testing steering
Every month, the workforce at Readiness analyzes the Patch Tuesday updates and offers detailed, actionable testing steering; that steering is predicated on assessing a big software portfolio and an in depth evaluation of the Microsoft patches and their potential impression on the Home windows platforms and software installations.
Given the big variety of adjustments included this month, I’ve damaged down the testing eventualities into high-risk and standard-risk teams.
Excessive threat
Microsoft revealed a number of excessive threat adjustments within the March replace. Whereas they could not result in performance adjustments, the testing profile for every replace must be necessary:
- Microsoft has up to date how DCOM responds to distant requests as a part of the latest hardening effort. This course of has been underneath method since June 2021 (Section 1), with an replace in June 2022 (Section 2) and now this month with all adjustments carried out as necessary. DCOM is a core Home windows part used for speaking between companies or processes. Microsoft has suggested that this (and full deployment of previous suggestions) will trigger application-level compatibility points. The corporate has provided some assist on what’s altering and methods to mitigate any compatibility points because of these latest necessary settings.
- A significant change to the core system file Win32kfull.sys has been included this month as two capabilities (DrvPlgBlt and nf-wingdi-plgblt) have been up to date. Microsoft has suggested there are not any practical adjustments to those capabilities. Testing functions that depend upon these capabilities can be important earlier than a full deployment of this month’s updates.
These eventualities require vital application-level testing earlier than common deployment.
- Bluetooth: Strive including and eradicating new Bluetooth gadgets. Stressing Bluetooth community gadgets can be extremely suggested.
- Home windows Community stack (TCPIP.SYS): Primary internet browsing, “regular” file transfers and video streaming must be adequate to check the adjustments to the Home windows networking stack.
- Hyper-V: Strive testing each Gen1 and Gen2 digital machines (VM’s). Each kinds of machines ought to begin, cease, shut down, pause, and resume efficiently.
Along with these adjustments, Microsoft up to date a key reminiscence perform (D3DKMTCreateDCFromMemory) that impacts two key system-level Home windows drivers (win32kbase.sys and win32kfull.sys). Sadly, in previous updates to those drivers, some customers have generated BSOD SYSTEM_SERVICE_EXCEPTION errors. Microsoft has posted data on methods to handle these points. Hopefully you do not have to resolve these sorts of points this month.
Home windows lifecycle replace
This part incorporates vital adjustments to servicing (and most safety updates) to Home windows desktop and server platforms over the following few months:
- Home windows 10 Enterprise (and Training), Model 20H2 and Home windows 10 IoT Enterprise, and Home windows Model 20H2 will attain an finish of servicing date on Could 9, 2023.
Every 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 Home windows (each desktop and server).
- Microsoft Workplace.
- Microsoft Trade Server.
- Microsoft Improvement platforms (ASP.NET Core, .NET Core and Chakra Core).
- Adobe (retired???, perhaps subsequent yr).
Browsers
There have been 22 updates for March (none rated essential), with 21 included within the Google launch channel and one (CVE-2023-24892) from Microsoft. All these updates are easy-to-deploy updates with marginal to low deployment threat. You could find Microsoft’s model of these launch notes right here and the Google Desktop channel launch notes right here. Add these updates to your customary patch launch schedule.
Home windows
Microsoft launched 10 essential updates and 48 patches rated as vital to the Home windows platform that cowl the next key elements:
- Microsoft Printer Postscript Drivers.
- Home windows Bluetooth Service.
- Home windows Win32K and Core Graphics elements (GDI).
- Home windows HTTP Protocol Stack and PPPoE.
Apart from the latest change to DCOM authentication (see DCOM hardening) most of this month’s updates have a really low threat profile. We’ve got a minor replace to a printing subsystem (Postscript 6) and different tweaks to community dealing with, storage, and graphics elements. Sadly, we’ve got an actual zero-day challenge with Home windows (CVE-2023-24880) SmartScreen (aka Home windows Defender) with experiences of each exploitation and a public disclosure. Consequently, add these Home windows updates to your “Patch Now” launch schedule.
Microsoft Workplace
Microsoft launched 11 updates to the Microsoft Workplace platform with one rated as (tremendous) essential and the remaining updates rated vital and affecting simply Excel and SharePoint. Sadly, the Microsoft Outlook replace (CVE-2023-23397) should be patched instantly. I’ve included suggestions provided by Microsoft in our mitigations part above which embody including customers to a better safety group and blocking ports 445/SMB in your community. Given the low threat of breaking different apps and the benefit of deployment of this patch, I’ve one other thought: add these Workplace updates to your “Patch Now” launch schedule.
Microsoft Trade Server
No Microsoft Trade updates required this month. That mentioned, there’s a significantly worrying challenge with Microsoft Outlook (CVE-2023-23397) that can be sufficient for any mail administrator to deal with this month.
Microsoft growth platforms
This can be a very gentle patch cycle for Microsoft growth platforms with simply 4 updates to Visible Studio (GitHub extensions) this month. All these updates are rated as vital by Microsoft and have a really low deployment threat profile. Add these updates to your customary developer launch schedule.
Adobe Reader (nonetheless right here, however simply not this month)
We could also be seeing a development right here as Adobe has not launched any updates for Adobe Reader. Additionally it is fascinating that that is the primary month in 9 that Microsoft has not launched any essential updates to its XPS, PDF or printing system. So, no necessary printer testing is required.
Copyright © 2023 IDG Communications, Inc.
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