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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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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 — Aug 30, 2021

Microsoft Exchange Vulnerability - Technical Details Released


On August 30th, 2021, the Zero-Day Initiative released technical details for the Microsoft Exchange server vulnerability CVE-2021-33766 (CVSS: 7.3), alternatively known as ProxyToken. This release is expected to result in exploitation of the vulnerability by threat actors in the near future.

ProxyToken is tracked as an Information Disclosure vulnerability. Exploitation would allow a remote attacker to bypass authentication and make changes to an Exchange email server’s configuration. This may lead to the theft of sensitive information, including employee emails.

This vulnerability was patched in the July 2021 Exchange cumulative updates. Organizations are strongly recommended to ensure all Exchange servers are up to date on relevant security patches before exploitation occurs.

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Additional information

The ProxyToken vulnerability was announced in Microsoft’s July Patch Tuesday vulnerability release, and security patches have been available since April 2021. The vulnerability exists due to two issues in the Exchange code; a non-empty cookie (SecurityToken) in requests is not authenticated, and an HTTP 500 error exposes an Exchange control panel canary token.

In recent months, multiple significant vulnerabilities have been identified impacting Microsoft Exchange servers. The publication of technical details for these vulnerabilities has directly preceded attacks in the wild. As technical details are now available for ProxyToken, there is a high probability of real-world attacks occurring in the immediate future. Organizations are strongly encouraged to apply security patches as soon as possible.

Impacted Products:

For additional technical details on the vulnerability, see the full report from Zero Day Initiative.


[1] https://www.zerodayinitiative.com/blog/2021/8/30/proxytoken-an-authentication-bypass-in-microsoft-exchange-server
[2] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-33766