CVE-2023-36777: Microsoft Exchange Server Information Disclosure Vulnerability

Overview

Severity
Medium (CVSS 5.7)
CVSS Vector
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
Category
Information Disclosure
Exploit Status
Not Exploited
Exploitation Likelihood
More Likely
Patch Tuesday
2023-Sep
Released
2023-09-12
EPSS Score
0.53% (percentile: 67.0%)

FAQ

According to the CVSS metric, the attack vector is adjacent (AV:A). What does that mean for this vulnerability? An authenticated attacker could exploit this vulnerability with LAN access. What type of information could be disclosed by this vulnerability? The type of information that could be disclosed if an attacker successfully exploited this vulnerability is file content. 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. 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. Is there more information available? Yes, please see September 2023 release of new Exchange Server CVEs for more information.

Affected Products (3)

Server Software

  • Microsoft Exchange Server 2019 Cumulative Update 12
  • Microsoft Exchange Server 2016 Cumulative Update 23
  • Microsoft Exchange Server 2019 Cumulative Update 13

Security Updates (3)

Acknowledgments

Piotr Bazydlo (@chudypb) of <a href="https://www.zerodayinitiative.com/">Trend Micro Zero Day Initiative</a>

Revision History

  • 2023-09-12: 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.