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Home Alerts

Zero-Day Threats in Microsoft Exchange

November 6, 2023
Reading Time: 5 mins read
in Alerts

A concerning security situation has emerged for Microsoft Exchange users as Trend Micro’s Zero Day Initiative (ZDI) disclosed four zero-day vulnerabilities that could enable remote attackers to execute arbitrary code or access sensitive data.

Furthermore, these vulnerabilities, which were reported to Microsoft in early September 2023, prompted concerns from ZDI when Microsoft deemed them less severe than anticipated, causing ZDI to independently publish the flaws. The most critical of these is ZDI-23-1578, a remote code execution (RCE) flaw that, if exploited, could lead to a complete system compromise, underscoring the significance of these vulnerabilities. While they require authentication for exploitation, the risk remains high due to various methods that cybercriminals employ to obtain Exchange credentials.

One of the key challenges is that mitigating these vulnerabilities by restricting interaction with Exchange apps can be highly disruptive for businesses and organizations relying on the product. ZDI suggests multi-factor authentication as a countermeasure, which can bolster security by preventing unauthorized access even when account credentials are compromised.

Given the gravity of the RCE vulnerability, vigilance and prompt action are essential for Exchange admins and users. 

References:
  • (0Day) Microsoft Exchange ChainedSerializationBinder Deserialization of Untrusted Data Remote Code Execution Vulnerability
  • (0Day) Microsoft Exchange DownloadDataFromUri Server-Side Request Forgery Information Disclosure Vulnerability
  • Microsoft Exchange DownloadDataFromOfficeMarketPlace Server-Side Request Forgery Information Disclosure Vulnerability
  • Microsoft Exchange CreateAttachmentFromUri Server-Side Request Forgery Information Disclosure Vulnerability
Tags: AttackersCyber AlertCyber Alerts 2023CybersecurityMicrosoftMicrosoft ExchangeNovember 2023Sensitive dataVulnerabilitieszero-day vulnerability
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