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SECURITY ADVISORIES
Sep 23, 2021
SolarMarker Malware Activity
THE THREAT eSentire has observed a recent and significant increase in SolarMarker infections delivered through drive-by download attacks. These attacks rely on social engineering techniques to persuade users to execute malware disguised as document templates. SolarMarker is a modular information-stealing malware; infections may result in the theft of sensitive data including user credentials.…
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eSentire is The Authority in Managed Detection and Response Services, protecting the critical data and applications of 1000+ organizations in 70+ countries from known and unknown cyber threats. Founded in 2001, the company’s mission is to hunt, investigate and stop cyber threats before they become business disrupting events.
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Aug 25, 2021
eSentire named a Leader in IDC MarketScape for U.S. Managed Detection and Response Services
August 26, 2021 – Waterloo, ON -  eSentire, recognized globally as the Authority in Managed Detection and Response (MDR), announced today that it has been named a Leader in the IDC MarketScape: U.S. Managed Detection and Response Services 2021 Vendor Assessment (doc #US48129921, August 2021). IDC defines the core services an MDR must provide as follows: reduced time for onboarding, 24/7…
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Security advisories — Jun 08, 2021

Microsoft Patch Tuesday – Six Zero-Day Vulnerabilities

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/