Security

Microsoft June 2021 Patch Tuesday addresses 6 zero-days actively exploited

Microsoft’s June 2021 Patch Tuesday addressed 50 vulnerabilities, including six zero-day issues that are being actively exploited in the wild.

Microsoft’s June 2021 Patch Tuesday addresses 50 vulnerabilities in Microsoft Windows, .NET Core and Visual Studio, Microsoft Office, Microsoft Edge (Chromium-based and EdgeHTML), SharePoint Server, Hyper-V, Visual Studio Code – Kubernetes Tools, Windows HTML Platform, and Windows Remote Desktop. Five vulnerabilities fixed by Microsoft’s June 2021 Patch Tuesday are rated Critical and 45 are rated Important in severity. Microsoft experts confirmed that six of these flaws are currently under active attack and three are publicly known at the time of release.

Eight of the flaws fixed by Microsoft were reported by the Zero Day Initiative (ZDI), other issues were reported by Google’s Threat Analysis Group, Google Project Zero, Check Point Research, FireEye, Kaspersky, and Nixu Cybersecurity. 

The six zero-day vulnerabilities actively exploited in the wild are:

  • CVE-2021-33742: Windows MSHTML Platform Remote Code Execution Vulnerability, CVSS 7.5
  • CVE-2021-33739: Microsoft DWM Core Library Elevation of Privilege Vulnerability, CVSS 8.4
  • CVE-2021-31199: Microsoft Enhanced Cryptographic Provider Elevation of Privilege Vulnerability, CVSS 5.2
  • CVE-2021-31201: Microsoft Enhanced Cryptographic Provider Elevation of Privilege Vulnerability, CVSS 5.2
  • CVE-2021-31955: Windows Kernel Information Disclosure Vulnerability, CVSS 5.5
  • CVE-2021-31956: Windows NTFS Elevation of Privilege Vulnerability, CVSS 7.8

Microsoft also addressed another zero-day flaw, tracked as CVE-2021-31968, which is a DoS issue that affects Windows Remote Desktop Services.

Kaspersky discovered two of the zero-day vulnerabilities, so we will likely see a report coming soon explaining how they were used.

“Looking at the remaining Critical-rated bugs, the update for Defender stands out even though you likely won’t need to take any action. Microsoft regularly updates the Malware Protection Engine, so if your system is connected to the Internet, it should have already received an update.” reads the post published by the ZeroDayInitiative.

The list of issues addressed by the IT giant is available here.

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Pierluigi Paganini

(SecurityAffairs – hacking, Microsoft’s June 2021 Patch Tuesday)

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Pierluigi Paganini

Pierluigi Paganini is member of the ENISA (European Union Agency for Network and Information Security) Threat Landscape Stakeholder Group and Cyber G7 Group, he is also a Security Evangelist, Security Analyst and Freelance Writer. Editor-in-Chief at "Cyber Defense Magazine", Pierluigi is a cyber security expert with over 20 years experience in the field, he is Certified Ethical Hacker at EC Council in London. The passion for writing and a strong belief that security is founded on sharing and awareness led Pierluigi to find the security blog "Security Affairs" recently named a Top National Security Resource for US. Pierluigi is a member of the "The Hacker News" team and he is a writer for some major publications in the field such as Cyber War Zone, ICTTF, Infosec Island, Infosec Institute, The Hacker News Magazine and for many other Security magazines. Author of the Books "The Deep Dark Web" and “Digital Virtual Currency and Bitcoin”.

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