CVE-2023-21554: 
vulnerability analysis and mitigation

Microsoft Message Queuing (MSMQ) Remote Code Execution Vulnerability, identified as CVE-2023-21554, was disclosed on April 11, 2023. The vulnerability affects various versions of Microsoft Windows systems including Windows 10 versions 1607, 1809, 20H2, 21H2, and 22H2 (NVD).

The vulnerability is related to the Microsoft Message Queuing (MSMQ) service and involves an improper input validation (CWE-20). The issue can be triggered by sending a MSMQ message with an altered DataLength field within the SRMPEnvelopeHeader that overflows the given buffer. On vulnerable systems, the integer wraps around and could cause an out-of-bounds write. The vulnerability has received a CVSS v3.1 base score of 9.8 (CRITICAL) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (NVD, Rapid7).

This vulnerability allows for remote code execution, potentially enabling attackers to execute arbitrary code with system privileges. The high CVSS score of 9.8 indicates critical severity with potential for complete compromise of confidentiality, integrity, and availability of the affected systems (NVD).

Microsoft has released security updates to address this vulnerability. Systems should be updated to versions that include the fix: Windows 10 1607 should update to version 10.0.14393.5850 or later, 1809 to version 10.0.17763.4252 or later, 20H2 to version 10.0.19042.2846 or later, 21H2 to version 10.0.19044.2846 or later, and 22H2 to the latest available version (NVD).