CVE-2023-36050
vulnerability analysis and mitigation

Overview

Microsoft Exchange Server Spoofing Vulnerability (CVE-2023-36050) is a security flaw affecting Microsoft Exchange Server installations. The vulnerability was first disclosed on November 14, 2023, impacting Microsoft Exchange Server 2016 (Cumulative Update 23) and Exchange Server 2019 (Cumulative Update 12 and 13) (NVD).

Technical details

The vulnerability exists within the SerializationTypeConverter class and stems from improper validation of user-supplied data, which can result in deserialization of untrusted data. The vulnerability has been assigned a CVSS v3.1 base score of 8.0 (HIGH) with the vector string CVSS:3.1/AV:A/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) (ZDI, NVD).

Impact

If exploited, this vulnerability allows remote attackers to disclose sensitive information or relay NTLM credentials on affected Microsoft Exchange installations. The attack can be leveraged to disclose information in the context of SYSTEM or to relay NTLM credentials. Authentication is required to exploit this vulnerability (ZDI).

Mitigation and workarounds

Microsoft has released security updates to address this vulnerability. The fixes are available through the November 14, 2023 security update (KB5032146) for affected versions of Exchange Server (Microsoft Support).

Additional resources


SourceThis report was generated using AI

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