Microsoft today released software updates to plug security holes in its Windows operating systems and related software. This month’s relatively light patch batch is refreshingly bereft of any zero-day threats, or even scary critical vulnerabilities. But it does fix four dozen flaws, including several that Microsoft says will likely soon be exploited by malware or malcontents.

While none of the patches address bugs that earned Microsoft’s most dire “critical” rating, there are multiple “remote code execution” vulnerabilities that Redmond believes are ripe for exploitation. Among those is CVE-2022-22005, a weakness in Microsoft’s Sharepoint Server versions 2013-2019 that could be exploited by any authenticated user.

“The vulnerability does require an attacker to be authenticated in order to exploit it, which is likely why Microsoft only labeled it ‘Important,’” said Allan Liska, senior security architect at Recorded Future. “However, given the number of stolen credentials readily available on underground markets, getting authenticated could be trivial. Organizations that have public-facing SharePoint Servers should prioritize implementing this patch.”

Kevin Breen at Immersive Labs called attention to CVE-2022-21996, an elevation of privilege vulnerability in the core Windows component “Win32k.”

“In January we saw CVE-2022-21882, a vulnerability in Win32k that was being actively exploited in the wild, which prompted CISA to issue a directive to all federal agencies to mandate that patches be applied,” Breen said. “February sees more patches for the same style of vulnerability in this same component. It’s not clear from the release notes whether this is a brand new vulnerability or if it is related to the previous month’s update. Either way, we have seen attackers leverage this vulnerability so it’s safer to err on the side of caution and update this one quickly.”

Another elevation of privilege flaw CVE-2022-21989 — in the Windows Kernel — was the only vulnerability fixed this month that was publicly disclosed prior to today.

“Despite the lack of critical fixes, it’s worth remembering that attackers love to use elevation of privilege vulnerabilities, of which there are 18 this month,” said Greg Wiseman, product manager at Rapid7. “Remote code execution vulnerabilities are also important to patch, even if they may not be considered ‘wormable.’ In terms of prioritization, defenders should first focus on patching server systems.”

February’s Patch Tuesday is once again brought to you by Print Spooler, the Windows component responsible for handling printing jobs. Four of the bugs quashed in this release relate to our friend Mr. Print Spooler. In July 2021, Microsoft issued an emergency fix for a Print Spooler flaw dubbed “PrintNightmare” that was actively being exploited to remotely compromise Windows PCs. Redmond has been steadily spooling out patches for this service ever since.

One important item to note this week is that Microsoft announced it will start blocking Internet macros by default in Office. This is a big deal because malicious macros hidden in Office documents have become a huge source of intrusions for organizations, and they are often the initial vector for ransomware attacks.

As Andrew Cunningham writes for Ars Technica, under the new regime when files that use macros are downloaded from the Internet, those macros will now be disabled entirely by default. The change will also be enabled for all currently supported standalone versions of Office, including versions 2021, 2019, 2016, and 2013.

“Current versions of the software offer an alert banner on these kinds of files that can be clicked through, but the new version of the banner offers no way to enable the macros,” Cunningham wrote. “The change will be previewed starting in April before being rolled out to all users of the continuously updated Microsoft 365 version of Office starting in June.”

January’s patch release was a tad heavier and rockier than most, with Microsoft forced to re-issue several patches to address unexpected issues caused by the updates. Breen said while February’s comparatively light burden should give system administrators some breathing room, it shouldn’t be viewed as an excuse to skip updates.

“But it does reinforce how important it is to test patches in a staging environment or use a staggered rollout, and why monitoring for any adverse impacts should always be a key step in your patching policy,” Breen said.

For a complete rundown of all patches released by Microsoft today and indexed by severity and other metrics, check out the always-useful Patch Tuesday roundup from the SANS Internet Storm Center. And it’s not a bad idea to hold off updating for a few days until Microsoft works out any kinks in the updates: AskWoody.com usually has the lowdown on any patches that may be causing problems for Windows users.

As always, please consider backing up your system or at least your important documents and data before applying system updates. And if you run into any problems with these patches, please drop a note about it here in the comments.

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Microsoft addresses 48 CVEs in its February 2022 Patch Tuesday release, including one zero-day vulnerability that was publicly disclosed, but not exploited in the wild.

0Critical
48Important
0Moderate
0Low

Microsoft patched 48 CVEs in the February 2022 Patch Tuesday release, with all 48 rated as important and none rated as critical.

This month’s update includes patches for:

Azure Data Explorer
Kestrel Web Server
Microsoft Dynamics
Microsoft Dynamics GP
Microsoft Edge (Chromium-based)
Microsoft Office
Microsoft Office Excel
Microsoft Office Outlook
Microsoft Office SharePoint
Microsoft Office Visio
Microsoft OneDrive
Microsoft Teams
Microsoft Windows Codecs Library
Power BI
Roaming Security Rights Management Services
Role: DNS Server
Role: Windows Hyper-V
SQL Server
Visual Studio Code
Windows Common Log File System Driver
Windows DWM Core Library
Windows Kernel
Windows Kernel-Mode Drivers
Windows Named Pipe File System
Windows Print Spooler Components
Windows Remote Access Connection Manager
Windows Remote Procedure Call Runtime
Windows User Account Profile
Windows Win32K

Remote code execution (RCE) vulnerabilities and elevation of privilege (EoP) both accounted for 33.3% of the vulnerabilities patched this month.

Tenable Solutions

Users can create scans that focus specifically on our Patch Tuesday plugins. From a new advanced scan, in the plugins tab, set an advanced filter for Plugin Name contains February 2022.

With that filter set, click the plugin families to the left and enable each plugin that appears on the right side. Note: If your families on the left say Enabled, then all the plugins in that family are set. Disable the whole family before selecting the individual plugins for this scan. Here’s an example from Tenable.io:

A list of all the plugins released for Tenable’s February 2022 Patch Tuesday update can be found here. As always, we recommend patching systems as soon as possible and regularly scanning your environment to identify those systems yet to be patched.

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Microsoft’s February 2022 Security Updates
Tenable plugins for Microsoft February 2022 Patch Tuesday Security Updates

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