July 18, 2024
Microsoft Patch Tuesday, January 2023 Version – Krebs on Safety

Microsoft immediately launched updates to repair practically 100 safety flaws in its Home windows working methods and different software program. Highlights from the primary Patch Tuesday of 2023 embody a zero-day vulnerability in Home windows, printer software program flaws reported by the U.S. Nationwide Safety Company, and a crucial Microsoft SharePoint Server bug that permits a distant, unauthenticated attacker to make an nameless connection.

At the least 11 of the patches launched immediately are rated “Important” by Microsoft, that means they could possibly be exploited by malware or malcontents to grab distant management over weak Home windows methods with little or no assist from customers.

Of specific concern for organizations operating Microsoft SharePoint Server is CVE-2023-21743. It is a Important safety bypass flaw that would enable a distant, unauthenticated attacker to make an nameless connection to a weak SharePoint server. Microsoft says this flaw is “extra prone to be exploited” in some unspecified time in the future.

However patching this bug is probably not so simple as deploying Microsoft updates. Dustin Childs, head of risk consciousness at Development Micro’s Zero Day Initiative, mentioned sysadmins must take extra measures to be absolutely protected against this vulnerability.

“To completely resolve this bug, it’s essential to additionally set off a SharePoint improve motion that’s additionally included on this replace,” Childs mentioned. “Full particulars on how to do that are within the bulletin. Conditions like this are why individuals who scream ‘Simply patch it!’ present they’ve by no means really needed to patch an enterprise in the actual world.”

Eighty-seven of the vulnerabilities earned Redmond’s barely much less dire “Vital” severity ranking. That designation describes vulnerabilities “whose exploitation might lead to compromise of the confidentiality, integrity, or availability of person information, or of the integrity or availability of processing sources.”

Among the many extra Vital bugs this month is CVE-2023-21674, which is an “elevation of privilege” weak spot in most supported variations of Home windows that has already been abused in lively assaults.

Satnam Narang, senior employees analysis engineer at Tenable, mentioned though particulars concerning the flaw weren’t out there on the time Microsoft printed its advisory on Patch Tuesday, it seems this was doubtless chained along with a vulnerability in a Chromium-based browser equivalent to Google Chrome or Microsoft Edge in an effort to escape of a browser’s sandbox and acquire full system entry.

“Vulnerabilities like CVE-2023-21674 are usually the work of superior persistent risk (APT) teams as a part of focused assaults,” Narang mentioned. “The probability of future widespread exploitation of an exploit chain like that is restricted because of auto-update performance used to patch browsers.”

By the best way, when was the final time you utterly closed out your Net browser and restarted it? Some browsers will robotically obtain and set up new safety updates, however the safety from these updates often solely occurs after you restart the browser.

Talking of APT teams, the U.S. Nationwide Safety Company is credited with reporting CVE-2023-21678, which is one other “necessary” vulnerability within the Home windows Print Spooler software program.

There have been so many vulnerabilities patched in Microsoft’s printing software program over the previous 12 months (together with the dastardly PrintNightmare assaults and borked patches) that KrebsOnSecurity has joked about Patch Tuesday studies being sponsored by Print Spooler. Tenable’s Narang factors out that that is the third Print Spooler flaw the NSA has reported within the final 12 months.

Kevin Breen at Immersive Labs referred to as particular consideration to CVE-2023-21563, which is a safety function bypass in BitLocker, the information and disk encryption know-how constructed into enterprise variations of Home windows.

“For organizations which have distant customers, or customers that journey, this vulnerability could also be of curiosity,” Breen mentioned. “We depend on BitLocker and full-disk encryption instruments to maintain our recordsdata and information protected within the occasion a laptop computer or machine is stolen. Whereas data is mild, this seems to recommend that it could possibly be doable for an attacker to bypass this safety and acquire entry to the underlying working system and its contents. If safety groups should not capable of apply this patch, one potential mitigation could possibly be to make sure Distant Gadget Administration is deployed with the flexibility to remotely disable and wipe property.”

There are additionally two Microsoft Alternate vulnerabilities patched this month — CVE-2023-21762 and CVE-2023-21745. Given the rapidity with which risk actors exploit new Alternate bugs to steal company e-mail and infiltrate weak methods, organizations utilizing Alternate ought to patch instantly. Microsoft’s advisory says these Alternate flaws are certainly “extra prone to be exploited.”

Adobe launched 4 patches addressing 29 flaws in Adobe Acrobat and Reader, InDesign, InCopy, and Adobe Dimension. The replace for Reader fixes 15 bugs with eight of those being ranked Important in severity (permitting arbitrary code execution if an affected system opened a specifically crafted file).

For a extra granular rundown on the updates launched immediately, see the SANS Internet Storm Center roundup. Almost 100 updates is rather a lot, and there are certain to be just a few patches that trigger issues for organizations and finish customers. When that occurs, AskWoody.com often has the lowdown.

Please contemplate backing up your information and/or imaging your system earlier than making use of any updates. And please pontificate within the feedback for those who expertise any issues on account of these patches.