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On June 8th, Microsoft released security updates to address a total of 50 unique vulnerabilities in their products. These vulnerabilities were disclosed as part of Microsoft’s monthly Patch Tuesday software update. Six vulnerabilities are classified as zero-days, meaning they have been exploited in the wild prior to patch release and are of the most concern. Four of the zero-day vulnerabilities allow for privilege escalation, one allows for information disclosure, and the final vulnerability may be exploited to cause Remote Code Execution (RCE).
Organizations are recommended to immediately prioritize installation of software updates provided by Microsoft to mitigate ongoing activity by threat actors to exploit these zero-day vulnerabilities.
The following vulnerabilities are all reported to have been exploited by threat actors prior to patch release:
CVE-2021-33739 (CVSS: 8.4): Microsoft DWM Core Library Elevation of Privilege Vulnerability
CVE-2021-31956 (CVSS: 7.8): Windows NTFS Elevation of Privilege Vulnerability
CVE-2021-33742 (CVSS: 7.5): Windows MSHTML Platform Remote Code Execution Vulnerability
CVE-2021-31199 (CVSS: 5.2): Microsoft Enhanced Cryptographic Provider Elevation of Privilege Vulnerability
CVE-2021-31201 (CVSS: 5.2): Microsoft Enhanced Cryptographic Provider Elevation of Privilege Vulnerability
CVE-2021-31955 (CVSS: 5.0): Windows Kernel Information Disclosure Vulnerability
CVE-2021-31955 and CVE-2021-31956 were identified and reported to Microsoft by Kaspersky. The company has stated that the vulnerabilities were exploited in highly targeted attacks against multiple organizations. In these attacks, adversaries exploited vulnerabilities in Chrome versions 89.0.4389.128 (patched April 13th) and 90.0.4430.72 (patched April 20th). Additional details on attacks are expected to emerge in the coming days. eSentire continues to investigate these issues for additional details and detection opportunities.