Microsoft has rolled out patches for 67 vulnerabilities in its products in its monthly Patch Tuesday, including a fix for a zero-day that is being exploited in the wild.
Seven patches were listed as being for critical issues, which means they are susceptible to either remote exploit or else elevation or privilege. The other 60 patches were rated as important.
The flaw that is being exploited was given the CVE number CVE-2021-43890. Satnam Narang, a staff researcher engineer from security firm Tenable, said this was a spoofing vulnerability in the Windows AppX Installer, which is used to install APPX apps on Windows 10 systems.
"According to reports, this vulnerability has been exploited in the wild," he said. "It has been linked to attacks associated with the Emotet/TrickBot/Bazaloader family.
"The Emotet botnet was originally shut down in January, but has since reappeared in November. To exploit this vulnerability, an attacker would need to convince a user to open a malicious attachment, which would likely be conducted through a phishing attack.
"Once exploited, the vulnerability would grant an attacker elevated privileges, particularly when the victim's account has administrative privileges on the system. If patching isn't an option, Microsoft has provided some workarounds to protect against the exploitation of this vulnerability."
Narang also pointed out that Microsoft had patched CVE-2021-43883, an elevation of privilege vulnerability in Windows Installer.
"This appears to be a fix for a patch bypass of CVE-2021-41379, another elevation of privilege vulnerability in Windows Installer that was reportedly fixed in November," he noted.
"However, researchers discovered that fix was incomplete, and a proof-of-concept was made public late last month."
More detail on some of the important and critical vulnerabilities disclosed by Microsoft is given here.
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