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Jan 13, 2022
GootLoader Hackers Are Compromising Employees of Law and Accounting Firms, Warns eSentire
GootLoader Gang Launches Wide-Spread Cyberattacks Enticing Legal and Accounting Employees to Download Malware eSentire, the industry’s leading Managed Detection and Response (MDR) cybersecurity provider, is warning law and accounting firms of a wide-spread GootLoader hacker campaign. In the past three weeks and as recently as January 6, eSentire’s threat hunters have intercepted and shut down…
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Oct 28, 2021
Telarus and eSentire Expand Partnership to Safeguard Enterprises Globally Against Business Disrupting Ransomware and Zero-Day Attacks
London, UK and Sydney, Australia– Oct. 28, 2021 - eSentire, recognized globally as the Authority in Managed Detection and Response (MDR), today announces the expansion of its partnership with Telarus, the largest privately-held distributor of business cloud infrastructure and contact centre services. Building on their mutual success across North America, Telarus will bring eSentire’s Managed…
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Security advisories — Jun 08, 2021

Microsoft Patch Tuesday – Six Zero-Day Vulnerabilities

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THE THREAT

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.

What we’re doing about it

What you should do about it

Additional information

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.

References:

[1] https://msrc.microsoft.com/update-guide
[2] https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-33739
[3] https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-31956
[4] https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-33742
[5] https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-31199
[6] https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-31201
[7] https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-31955
[8] https://securelist.com/puzzlemaker-chrome-zero-day-exploit-chain/102771/

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