November Patch Tuesday descend fixes bugs in Excel, Trade Server

One other rather gentle Patch Tuesday descend from Microsoft addresses 55 vulnerabilities, two of them already being exploited

Alex Scroxton


Revealed: 10 Nov 2021 16: 17

On one other comparatively gentle Patch Tuesday, Microsoft has issued fixes for a whole of 55 newly uncovered standard vulnerabilities and exposures (CVEs), six of them rated as crucial, and two which would perchance perhaps perhaps even very properly be already being publicly exploited.

The two CVEs in request are CVE-2021-42292, a security feature bypass vulnerability in Microsoft Excel, and CVE-2021-42321, a some distance off code execution (RCE) vulnerability in Microsoft Trade Server. Both are rated fundamental, with CVSS rankings of 7.8 and 8.8, respectively.

“CVE-2021-42321 needs to be of foremost field,” said Recorded Future senior security architect Allan Liska. “This vulnerability is one that is being actively exploited in the wild. Trade vulnerabilities had been of particular field this year.

“Both Chinese language nation impart actors and the cyber criminals in the support of the DearCry ransomware (also believed to be working out of China) exploited earlier vulnerabilities in Microsoft Trade (CVE-2021-26855 and CVE-2021-27065). While Microsoft ideal rates the vulnerability as ‘Most critical’ because of an attacker have to be authenticated to consume it, Recorded Future has noteworthy that gaining genuine credential access to Dwelling windows programs has change into trivial for both nation impart and cyber prison actors. This needs to be prioritised for patching. 

“The different vulnerability that is being exploited in the wild is CVE-2021-42292. Right here’s a security feature bypass vulnerability for Microsoft Excel for both Dwelling windows and MacOS computer programs. This vulnerability affects versions 2013-2021.”

Liska added: “Microsoft just is not certain in its description which security feature is bypassed by the vulnerability. Then all once more, all once more, the indisputable fact that it’s being exploited in the wild is referring to and means it needs to be prioritised for patching. Microsoft Excel is a frequent target of both nation impart attackers and cyber criminals.”

The six crucial vulnerabilities are listed as: CVE-2021-3711, which is a decryption buffer overflow flaw in OpenSSL; CVE-2021-26443, one other RCE vulnerability in Microsoft Virtual Machine Bus; CVE-2021-38666, an RCE vulnerability in Far-off Desktop Consumer; CVE-2021-42270, a memory corruption vulnerability in the Chakra scripting engine; CVE-2021-42298, an RCE vulnerability in Microsoft Defender; and CVE-2021-42316, yet one other RCE vulnerability in Microsoft Dynamics 365.

None of the above-listed bugs are on the second being exploited in the wild on the time of writing, even supposing this is capable of perhaps perhaps even fair properly alternate in short inform, and plenty of in the safety neighborhood are already elevating concerns, among them Danny Kim, fundamental architect at Virsec, who said the Microsoft Defender vulnerability became once in particular being concerned.

“With the exploitability overview of ‘Exploitation more likely’ and the severity ranking and the repeatability of this assault, I deem this CVE needs to be high of suggestions for all enterprises,” Kim suggested Computer Weekly in emailed feedback.

“Dwelling windows Defender runs on all supported versions of Dwelling windows. This vulnerability vastly increases the functionality assault surface for this day’s organisations as a result of recognition of Dwelling windows Defender. This CVE does require some client interplay, alternatively now we possess considered in the previous how attackers can consume social engineering/phishing emails to arrangement such interplay pretty without danger.”

Jay Goodman of Automox flagged both the vulnerabilities in the Chakra scripting engine and Microsoft Dynamics 365 as mighty.

“The Chakra scripting engine is widely frail in Microsoft Edge and RCE vulnerabilities are in particular shiny provided that they enable attackers to at once bustle malicious code on the exploited programs,” he said. “It is extremely suggested that IT administrators remediate this vulnerability internal 72 hours to minimise publicity to risk actors.

“Microsoft Dynamics 365 is a helpful resource planning and CRM utility from Microsoft and this vulnerability is show in the 9.0 and 9.1 versions of their on-premise option. Far-off code execution vulnerabilities are in particular shiny provided that they enable attackers to at once bustle malicious code on the exploited programs.”

Goodman added: “It is extremely suggested that IT administrators remediate this vulnerability internal 72 hours to minimise publicity to risk actors, especially in a utility with access to shiny buyer and enterprise knowledge treasure a CRM resolution.”

Meanwhile, one other lighter-than-typical Patch Tuesday has raised eyebrows at Vogue Micro’s Zero Day Initiative, the attach aside communications lead Dustin Childs suggested that the downward pattern could perhaps well be a trigger for field.

“Historically speaking, 55 patches in November is a rather low number,” he wrote. “Last year, there had been better than double this number of CVEs mounted. Even going support to 2018, when there had been ideal 691 CVEs mounted all year, there had been more November CVEs mounted than in this month.

“Provided that December is incessantly a slower month patch-radiant, it causes one to wonder if there could be a backlog of patches observing for deployment because of numerous elements. It appears habitual that Microsoft would be releasing fewer patches after seeing nothing but increases at some level of the industry for years.”

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