CVE-2023-21528 in SQL Server
Summary
by MITRE • 02/14/2023
Microsoft SQL Server Remote Code Execution Vulnerability
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Analysis
by VulDB Data Team • 03/15/2023
Microsoft SQL Server contains a remote code execution vulnerability that arises from improper input validation within the database engine's handling of specific query operations. This flaw exists in the way SQL Server processes certain T-SQL statements and can be exploited by remote attackers to execute arbitrary code on the target system with the privileges of the SQL Server service account. The vulnerability stems from a lack of proper bounds checking and input sanitization mechanisms that should prevent malicious data from being processed within the database engine's memory management systems. Attackers can craft specially malformed SQL queries that trigger buffer overflows or memory corruption conditions, which subsequently allow for code execution. The issue affects multiple versions of Microsoft SQL Server including 2016, 2017, 2019, and 2022 editions, with the severity classified as critical due to the ease of exploitation and potential for privilege escalation. This vulnerability aligns with CWE-121 and CWE-125 categories related to buffer overflows and improper input validation. From an operational perspective, successful exploitation can lead to complete system compromise, data exfiltration, and lateral movement within network environments where SQL Server instances are deployed. The attack surface is particularly concerning given that SQL Server instances are commonly exposed to external networks and often run with elevated privileges. The vulnerability demonstrates characteristics consistent with ATT&CK technique T1210 - Exploitation of Remote Services, as it leverages remote access capabilities to achieve code execution. Organizations running affected SQL Server versions should immediately apply the relevant security patches provided by Microsoft, implement network segmentation to limit exposure, and monitor for suspicious database activity. Additionally, implementing principle of least privilege for SQL Server accounts and disabling unnecessary network protocols can significantly reduce the attack surface. The flaw represents a critical weakness in database security architecture that requires immediate remediation to prevent unauthorized access and potential data breaches. Microsoft has released security updates through their regular patching schedule, and organizations should prioritize deployment of these patches as part of their vulnerability management processes.