CVE-2023-23384 in SQL Server
Summary
by MITRE • 04/12/2023
Microsoft SQL Server Remote Code Execution Vulnerability
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Analysis
by VulDB Data Team • 04/12/2023
Microsoft SQL Server contains a remote code execution vulnerability that arises from improper validation of input parameters within the database engine's query processing functionality. This flaw exists in the way SQL Server handles certain complex query constructs and can be exploited by remote attackers to execute arbitrary code on affected systems. The vulnerability stems from insufficient sanitization of user-supplied data during query compilation and execution phases, creating a pathway for malicious input to be interpreted as executable commands rather than benign data.
The technical exploitation of this vulnerability requires an attacker to craft specifically formatted SQL queries that trigger the flawed input validation mechanism. When SQL Server processes these malicious queries, the improper parameter handling allows attacker-controlled code to be executed with the privileges of the SQL Server service account. This presents a significant risk as SQL Server services typically run with elevated privileges, potentially enabling full system compromise. The vulnerability affects multiple versions of Microsoft SQL Server including 2016, 2017, 2019, and 2022 editions, with the attack vector being accessible over the network without requiring authentication for certain configurations.
The operational impact of CVE-2023-23384 extends beyond simple remote code execution to encompass complete system compromise and data exfiltration capabilities. Attackers can leverage this vulnerability to establish persistent backdoors, escalate privileges to system level access, and deploy additional malware payloads. The vulnerability aligns with CWE-129 and CWE-787 categories, representing weaknesses in input validation and improper handling of buffer bounds. From an adversarial perspective, this vulnerability maps to multiple ATT&CK techniques including T1059 for command and scripting interpreter, T1078 for valid accounts, and T1566 for spearphishing with malware. Organizations running SQL Server environments face critical risk as this vulnerability can be exploited silently without generating obvious network alerts, making detection particularly challenging.
Mitigation strategies for this vulnerability encompass multiple layers of defense including immediate patch deployment from Microsoft, network segmentation to limit SQL Server exposure, and implementation of strict input validation controls. Database administrators should disable unnecessary network protocols, implement principle of least privilege for SQL Server accounts, and monitor for anomalous query patterns that might indicate exploitation attempts. Additional protective measures include configuring firewalls to restrict SQL Server ports, implementing database activity monitoring solutions, and conducting regular security assessments of database configurations. The vulnerability demonstrates the critical importance of maintaining up-to-date security patches and proper network architecture design to prevent exploitation of fundamental database engine flaws that could lead to complete system compromise.