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

Microsoft has launched 71 safety fixes for device together with an actively-exploited zero-day trojan horse in Win32okay. 

The Redmond large’s newest spherical of patches, typically launched on the second one Tuesday of each and every month in what’s referred to as Patch Tuesday, contains fixes for a complete of 4 zero-day flaws, 3 of which can be public.

Merchandise impacted through October’s safety replace come with Microsoft Administrative center, Trade Server, MSHTML, Visible Studio, and the Edge browser. 

The zero-day insects 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 ranking of seven.eight, this vulnerability affects the Win32Okay kernel motive force. Boris Larin (oct0xor) with Kaspersky reported the flaw to Microsoft, and in a weblog put up revealed lately, the cybersecurity company stated a litter of task, dubbed MysterySnail, is using the use-after-free flaw.

“But even so discovering the zero-day within the wild, we analyzed the malware payload used along side the zero-day exploit, and located that variants of the malware had been detected in standard espionage campaigns towards IT corporations, army/protection contractors, and diplomatic entities,” Kaspersky says.

Immersive Labs’ Kevin Breen, Director of Cyber Risk Analysis, stated that this factor “will have to indisputably be a concern to patch.” 

“It is famous as ‘exploitation detected’, that means attackers are already the use of it towards organizations to realize admin rights,” Breen commented. “Gaining this degree of get right of entry to on a compromised host is step one in opposition to changing into a website admin — and securing complete get right of entry to to a community.”

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The 3 different zero-day vulnerabilities resolved on this spherical of patches are CVE-2021-41338 (CVSS five.five), a Home windows AppContainer Firewall trojan horse that allows attackers to circumvent security measures; CVE-2021-40469 (CVSS 7.2), an RCE in Home windows DNS Server; and CVE-2021-41335 (CVSS 7.eight), an elevation of privilege trojan horse within the Home windows Kernel. 

3 essential insects, CVE-2021-40486, CVE-2021-38672, and CVE-2021-40461, also are of word. The primary safety flaw affects Microsoft Phrase while the opposite two have an effect on Hyper-V. If exploited, they all can result in far off code execution.

Consistent with the 0 Day Initiative (ZDI), 11 of the protection flaws patched this month had been submitted in the course of the ZDI program, together with insects resolved previous within the month through the Edge browser crew.

Remaining month, Microsoft resolved over 60 insects 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 large tackled 45 safety flaws — seven of which have been deemed essential — all over the August Patch Tuesday.

In different Microsoft information, the tech large is readying a brand new Comments Portal, anticipated to be in a position in preview mode, through the tip of 2021. The portal shall be opened first for Microsoft 365 and Microsoft Edge merchandise. The Redmond large has additionally not too long ago warned of password spraying assaults being introduced towards Administrative center 365 consumers. 


Along Microsoft’s Patch Tuesday spherical, different distributors, too, have revealed safety updates which may also be accessed underneath.

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