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Wednesday, 11 May 2022 08:43

Microsoft's May diet: patches for 73 flaws, including two zero-days Featured

Microsoft's May diet: patches for 73 flaws, including two zero-days Image by Warren Matthews from Pixabay

Microsoft has issued patches for 73 CVEs, including two zero-day flaws one of which has been exploited in the wild, as part of its monthly Patch Tuesday release.

Six of the vulnerabilities were rated critical with 66 getting that rating of important and only one that was rated low.

The flaw that has been exploited in the wild is a spoofing vulnerability in Windows Local Security Authority. This was fixed back in August 2021, but appears to have been reintroduced in some patch between December 2021 and March this year.

Microsoft did not provide too many details about this bug, only saying: "An unauthenticated attacker could call a method on the LSARPC interface and coerce the domain controller to authenticate to the attacker using NTLM.

“This security update detects anonymous connection attempts in LSARPC and disallows it."

Satnam Narang, staff research engineer at security outfit Tenable, said: "While the flaw is rated as important and was assigned a CVSSv3 score of 8.1, if it is chained with other NTLM Relay attacks like PetitPotam, the CVSSv3 score would increase to 9.8, elevating the severity of this flaw to critical.

"The complexity of exploiting this flaw is considered high because exploitation requires an attacker to be seated as an attacker-in-the-middle.

"In addition to patching this flaw, organisations should refer to KB5005413 for ways to mitigate NTLM Relay Attacks against Active Directory Certificate Services."

He said additionally, there were several Windows Print Spooler vulnerabilities patched this month.

"[These included] two information disclosure flaws (CVE-2022-29114 and CVE-2022-29140) and two elevation of privilege flaws (CVE-2022-29104 and CVE-2022-29132).

"All of the flaws are rated as important, and two of the three are considered more likely to be exploited.

"Windows Print Spooler continues to remain a valuable target for attackers since PrintNightmare was disclosed nearly a year ago.

"Elevation of Privilege flaws in particular should be carefully prioritised, as we’ve seen ransomware groups like Conti favour them as part of its playbook."

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Sam Varghese

Sam Varghese has been writing for iTWire since 2006, a year after the site came into existence. For nearly a decade thereafter, he wrote mostly about free and open source software, based on his own use of this genre of software. Since May 2016, he has been writing across many areas of technology. He has been a journalist for nearly 40 years in India (Indian Express and Deccan Herald), the UAE (Khaleej Times) and Australia (Daily Commercial News (now defunct) and The Age). His personal blog is titled Irregular Expression.

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