Microsoft October 2021 Patch Tuesday: 71 vulnerabilities, 4 zero-days squashed

Microsoft has launched 71 safety fixes for software program together with an actively-exploited zero-day bug in Win32k. 

The Redmond big’s newest spherical of patches, often launched on the second Tuesday of every month in what is called Patch Tuesday, contains fixes for a complete of 4 zero-day flaws, three of that are public.

Merchandise impacted by October’s safety replace embody Microsoft Workplace, Trade Server, MSHTML, Visible Studio, and the Edge browser. 

The zero-day bugs are tracked as CVE-2021-40449, CVE-2021-41338, CVE-2021-40469, and CVE-2021-41335.   

CVE-2021-40449 is being actively exploited. Issued a CVSS severity rating of seven.8, this vulnerability impacts the Win32K kernel driver. Boris Larin (oct0xor) with Kaspersky reported the flaw to Microsoft, and in a weblog put up revealed at this time, the cybersecurity agency stated a litter of exercise, dubbed MysterySnail, is using the use-after-free flaw.

“In addition to discovering the zero-day within the wild, we analyzed the malware payload used together with the zero-day exploit, and located that variants of the malware have been detected in widespread espionage campaigns towards IT corporations, army/protection contractors, and diplomatic entities,” Kaspersky says.

Immersive Labs’ Kevin Breen, Director of Cyber Menace Analysis, stated that this situation “ought to undoubtedly be a precedence to patch.” 

“It is famous as ‘exploitation detected’, which means attackers are already utilizing it towards organizations to achieve admin rights,” Breen commented. “Gaining this degree of entry on a compromised host is step one in direction of turning into a website admin — and securing full entry to a community.”

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The three different zero-day vulnerabilities resolved on this spherical of patches are CVE-2021-41338 (CVSS 5.5), a Home windows AppContainer Firewall bug that allows attackers to bypass safety features; CVE-2021-40469 (CVSS 7.2), an RCE in Home windows DNS Server; and CVE-2021-41335 (CVSS 7.8), an elevation of privilege bug within the Home windows Kernel. 

Three crucial bugs, CVE-2021-40486, CVE-2021-38672, and CVE-2021-40461, are additionally of be aware. The primary safety flaw impacts Microsoft Phrase whereas the opposite two have an effect on Hyper-V. If exploited, all of them can result in distant code execution.

In response to the Zero Day Initiative (ZDI), 11 of the safety flaws patched this month have been submitted by the ZDI program, together with bugs resolved earlier within the month by the Edge browser crew.

Final month, Microsoft resolved over 60 bugs within the September batch of safety fixes together with an RCE flaw in MSHTML and a Home windows DNS privilege escalation zero-day vulnerability. 

A month prior, the tech big tackled 45 safety flaws — seven of which have been deemed crucial — in the course of the August Patch Tuesday.

In different Microsoft information, the tech big is readying a brand new Suggestions Portal, anticipated to be prepared in preview mode, by the tip of 2021. The portal might be opened first for Microsoft 365 and Microsoft Edge merchandise. The Redmond big has additionally just lately warned of password spraying assaults being launched towards Workplace 365 prospects. 

Alongside Microsoft’s Patch Tuesday spherical, different distributors, too, have revealed safety updates which will be accessed beneath.

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