Microsoft's Security Threat Intelligence Center (MSTIC) is credited with discovering this flaw, and they say that it was exploited in the wild as a zero-day. Narang explained a little more about the Excel vulnerability in a released comment:
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He also noted that there's currently no patch available for Office for Mac users. Childs speculated it could be associated with attached Excel files that can load code. It allows the bypassing of security settings on machines. The Excel exploit, which is active, isn't really described by Microsoft. Microsoft also on Tuesday released general November Exchange Server security updates guidance, which can be found in this announcement. "Microsoft Exchange Server has been the subject of several notable vulnerabilities throughout 2021, from ProxyLogon and associated vulnerabilities, as well as ProxyShell," Narang noted. It's yet another Exchange Server problem to address. Organizations should patch it "as soon as possible," said Satnam Narang, a staff research engineer at security solutions firm Tenable, in released comments. The Exchange Server vulnerability, with a Common Vulnerability Scoring System (CVSS) ranking of 8.8 out of 10, requires the attacker to be authenticated on a system, but it's an active threat.
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The two CVEs getting used in attacks are CVE-2021-42321, an Important vulnerability in Microsoft Exchange Server that can lead to remote code execution (RCE) attacks, and CVE-202 1-42292, an Important vulnerability in Excel that bypasses security protections. Microsoft offers "Release Notes" for the November patches at this page, which has pointers to FAQs and workarounds, along with a list of the affected products. Two Important CVEs were described as having been exploited, meaning they are currently getting used in active attacks. Of the 55 CVEs getting patches, six are rated "Critical" by researchers, while all of the rest are deemed "Important." Four Important CVEs in the bunch are said to be publicly known, which ups risks for organizations. Security solutions firm Automox described Microsoft's November patch count as representing a "27% reduction from the monthly average so far this year," per Automox patch Tuesday commentary. The November bundle seems unexpectedly light given that Microsoft typically releases smaller patch loads in December before the holidays, explained Dustin Childs in Trend Micro's Zero Day Initiative (ZDI) blog, which offers counts and analyses. Microsoft on Tuesday released its November security patch bundle, addressing 55 common vulnerabilities and disclosures (CVEs).