CVE-2024-21358 in Windows
Summary
by MITRE • 02/13/2024
Microsoft WDAC OLE DB provider for SQL Server Remote Code Execution Vulnerability
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Analysis
by VulDB Data Team • 07/06/2026
This vulnerability resides within Microsoft Windows Defender Application Control's OLE DB provider component for SQL Server, representing a critical remote code execution flaw that could enable attackers to execute arbitrary code on affected systems. The vulnerability stems from improper input validation within the OLE DB provider implementation, specifically when processing maliciously crafted database connection strings or query parameters. According to CWE-129, this represents an insufficient validation of length or bounds, while the ATT&CK framework categorizes this under TA0002 Execution with T1059 Command and Scripting Interpreter. The flaw exists in the provider's handling of untrusted data during database connection establishment processes, where inadequate sanitization allows attackers to inject malicious payloads that bypass normal security controls.
The technical exploitation occurs when a malicious actor crafts specially formatted OLE DB connection strings or SQL queries that trigger buffer overflow conditions or memory corruption within the provider's parsing routines. This vulnerability affects systems running Windows Defender Application Control with the OLE DB provider installed, particularly those configured to use SQL Server connectivity for application control policy validation. Attackers can leverage this weakness through various attack vectors including compromised database servers, man-in-the-middle scenarios, or by manipulating trusted network communications where the OLE DB provider is invoked during policy enforcement operations.
Operational impact of this vulnerability extends beyond immediate code execution capabilities to encompass complete system compromise and potential lateral movement within network environments. The vulnerability affects organizations that rely on WDAC for application control policies, as successful exploitation could allow attackers to bypass application whitelisting controls and execute malicious software without detection. Systems running vulnerable versions of Windows Defender Application Control are particularly at risk, especially those with SQL Server connectivity enabled for policy management or auditing purposes. The vulnerability's remote nature means attackers need only access to network resources that can trigger the OLE DB provider execution path.
Mitigation strategies should focus on immediate patch deployment through Microsoft's security updates, which address the underlying input validation flaws in the OLE DB provider implementation. Organizations must also implement network segmentation and access controls to limit exposure of systems running vulnerable components, particularly those with SQL Server connectivity enabled for WDAC policy operations. Security monitoring should be enhanced to detect anomalous database connection patterns or unexpected execution of OLE DB provider processes, as outlined in MITRE ATT&CK's monitoring recommendations for command execution techniques. Additionally, implementing least privilege principles for database access and disabling unnecessary SQL Server connectivity features can significantly reduce the attack surface for exploitation of this vulnerability.