Microsoft Released a Security Update With The Fixes For 6 New Windows 0-Day Bugs

Recently, as a part of the June Patch, Microsoft has fixed 50 security flaws, among which 5 of them were rated critical, and the other 45 are classed as important in severity.

All the vulnerabilities have been patched by Microsoft that are present in the following products of Microsoft:-

  • Microsoft Office
  • .NET Core and Visual Studio
  • Edge browser
  • Windows Cryptographic Services
  • SharePoint
  • Outlook
  • Excel

Zero-day vulnerabilities

Apart from these things, Microsoft has also addressed 6 zero-day vulnerabilities, and among these 6 zero-day vulnerabilities, the security experts at Microsoft have detected that one of the flaws has been using a commercial exploit.

Here the list of all 6 zero-day vulnerabilities:-

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

However, to give all its users and administrators more time to install the patches, Microsoft has not yet unveiled any details of the vulnerabilities.

Among the 6 zero-day vulnerabilities, 4 vulnerabilities are privilege escalation flaws which imply that hackers might have exploited these security flaws to gain elevated permissions on the affected systems as part of the infection chain.

Moreover, the security researchers at Microsoft have asserted that the CVE-2021-33742 is an RCE vulnerability in the MSHTML component, which is part of the Internet Explorer web browser.

While Shane Huntley, the Google analyst has claimed, that the CVE-2021-33742 is not only abused by independent threat actors but also used by government hackers to attack targets in Eastern Europe and the Middle East.

The patches for CVE-2021-31201 and CVE-2021-31199 are related to the RCE issue CVE-2021-28550, which was already fixed last month by the developers at Adobe.

So, to protect your Windows system and avoid such security risks, Microsoft has strongly recommended all its users to install all the security updates immediately.

You can refer the complete patch details for the full list of vulnerabilities resolved, advisories, in the June 2021 Patch here.

Microsoft strongly recommended installing these security updates for all the windows users to avoid the security risk and protect your Windows.

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BALAJI is an Ex-Security Researcher (Threat Research Labs) at Comodo Cybersecurity. Editor-in-Chief & Co-Founder - Cyber Security News & GBHackers On Security.


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