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Sep 28, 2021
UPDATE: Critical VMware vCenter Vulnerability
THE THREAT UPDATE: Exploitation of CVE-2021-22005 has been identified in the wild. Fully functional Proof-of-Concept (PoC) exploit code for CVE-2021-22005 was publicly released on September 27th. The release of PoC code is expected to result in widespread exploitation of the vulnerability in the immediate future. Organizations need to ensure that either the VMware security patches, or temporary…
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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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Oct 12, 2021
eSentire Launches MDR with Microsoft Azure Sentinel Extending Response Capabilities Across Entire Microsoft Security Ecosystem
Waterloo, ON – Oct. 12, 2021 -- eSentire, recognized globally as the Authority in Managed Detection and Response (MDR), today announced the expansion of its award-winning MDR services with Microsoft Azure Sentinel, as part of its integration with the complete Microsoft 365 Defender and Azure Defender product suites supporting Microsoft SIEM, endpoint, identity, email and cloud security services.…
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Security advisories — Mar 10, 2021

Proof-of-Concept Exploit Code Released for Critical Exchange Vulnerabilities

THE THREAT

As of, March 10th, 2021, publicly available Proof-of-Concept (PoC) exploit code and in-depth technical details for two of the recent Microsoft Exchange zero-day vulnerabilities (known as ProxyLogon) has been confirmed. The PoC code will allow less skilled threat actors to exploit CVE-2021–26855 and CVE-2021–27065 and cause Remote Code Execution on vulnerable on-premise Exchange servers.

Widespread exploitation of these vulnerabilities is now imminent. Organizations that have not already applied the Microsoft security patches need to do so immediately.

What we’re doing about it

What you should do about it

Additional information

The eSentire Threat Intelligence team has observed several markers towards mass exploitation of ProxyLogon vulnerabilities in the last 24 hours. Security firm Praetorian released technical details of the vulnerabilities on March 9th, but omitted publishing key details for exploitation. During the afternoon of March 10th, several reports of working Proof-of-Concept code emerged online. While we have not independently verified the PoC, several prominent security researchers have attested to their validity.

Given the increasing scope of widespread attacks over the past week and emergence of vulnerability details and working exploits, organizations must take immediate action to mitigate the vulnerabilities through security updates, workarounds or by restricting access to their on-prem Exchange servers.