CVE-2023-32031: 
vulnerability analysis and mitigation

Microsoft Exchange Server Remote Code Execution Vulnerability (CVE-2023-32031) is a security flaw that affects Microsoft Exchange Server installations. The vulnerability was discovered and reported to Microsoft on March 31, 2023, and was publicly disclosed on June 13, 2023. It affects multiple versions of Exchange Server, including Exchange Server 2016 Cumulative Update 23 and Exchange Server 2019 Cumulative Updates 12 and 13 (ZDI Advisory).

The vulnerability exists within the Command class and stems from improper validation of user-supplied data, which can result in deserialization of untrusted data. It has been assigned a CVSS v3.1 base score of 8.8 (HIGH) with the vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. The vulnerability has been classified under CWE-502 (Deserialization of Untrusted Data) (NVD, ZDI Advisory).

If successfully exploited, this vulnerability allows authenticated remote attackers to execute arbitrary code in the context of SYSTEM on affected Microsoft Exchange Server installations. This means an attacker could potentially take complete control of the affected system with the highest privileges (ZDI Advisory).

Microsoft has released security updates to address this vulnerability. Organizations running affected versions of Exchange Server should apply the relevant security updates. For Exchange Server 2019, the fixes are included in Cumulative Update 12 SU8 and Cumulative Update 13 SU1 (Microsoft Support).