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OpenAdvisories
High MSRC-CVE-2023-36757 1 CVE

Microsoft Exchange Server Spoofing Vulnerability

Published Sep 12, 2023 · Updated Sep 12, 2023

Vendor: Microsoft

Summary

Impact: Spoofing. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

According to the CVSS metric, privileges required is low (PR:L). Does the attacker need to be in an authenticated role on the Exchange Server?
Yes, the attacker must be authenticated with LAN-access and have credentials for a valid Exchange user.

According to the CVSS metrics, successful exploitation of this vulnerability could lead to major loss of confidentiality (C:H), integrity (I:H) and availability (A:H). What does that mean for this vulnerability?
An attacker who successfully exploited this vulnerability could access a user's Net-NTLMv2 hash which could be used as a basis of an NTLM Relay attack against another service to authenticate as the user.

What updates do I need to install to be protected from this vulnerability?
Customers need to install the August 2023 Exchange security updates which are listed in the Security Updates table. Customers who have already August 2023 security updates are already protected from this vulnerability.
Yes, please see September 2023 release of new Exchange Server CVEs for more information.

Security updates
15.01.2507.032 — https://support.microsoft.com/help/5030524

Vulnerabilities 1

Revision history

  1. #1

    Information published. This CVE was addressed by updates that were released in August 2023, but the CVE was inadvertently omitted from the August 2023 Security Updates. Microsoft strongly recommends that customers running affected versions of Microsoft Exchange Server install the August 2023 updates to be protected from this vulnerability.

References