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Rewterz Threat Advisory – CVE-2021-31198 – Microsoft Exchange Server Remote Code Execution Vulnerability

Severity

High

Analysis Summary

CVE-2021-31198

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Microsoft Exchange Server. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the OAB service. The issue results from the lack of proper validation of user-supplied data, which can allow arbitrary files write to OAB folders. An attacker can leverage this vulnerability to execute arbitrary code in the context of SYSTEM.

Impact

  • Code Execution
  • Unauthorized Access

Affected Vendors

Microsoft

Affected Products

  • Microsoft Exchange Server

Remediation

Microsoft has issued an update to correct this vulnerability. More details can be found at:

https://msrc.microsoft.com/update-guide/en-us/vulnerability/CVE-2021-31198