CVE-2024-21369 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 • 05/17/2026
This vulnerability resides within Microsoft Windows Defender Application Control's OLE DB provider for SQL Server component, representing a critical remote code execution flaw that could be exploited by attackers to gain unauthorized system access. The vulnerability stems from improper input validation within the OLE DB provider implementation, specifically when processing maliciously crafted database connection strings or query parameters. Attackers can leverage this weakness by crafting specially formatted SQL commands or connection strings that trigger buffer overflows or arbitrary code execution within the context of the SQL Server service account. The flaw exists at the application layer where the OLE DB provider fails to properly sanitize user-supplied input before processing, creating a pathway for malicious code injection that bypasses standard security controls.
The technical exploitation of this vulnerability follows a pattern consistent with CWE-121 buffer overflow conditions and CWE-78 command injection weaknesses, where insufficient input validation allows attackers to manipulate memory structures or execute arbitrary commands. The attack vector typically involves sending malicious payloads through database connection interfaces that utilize the vulnerable OLE DB provider, potentially leveraging techniques described in the MITRE ATT&CK framework under T1059 command and scripting interpreter and T1203 proxy execution. When successfully exploited, the vulnerability allows attackers to execute code with the privileges of the SQL Server service account, which often runs with elevated system permissions, potentially leading to complete system compromise. The vulnerability affects systems running affected versions of Windows Defender Application Control alongside SQL Server components, particularly when the OLE DB provider is enabled for database connections.
The operational impact of this vulnerability extends beyond immediate code execution capabilities to encompass broader security implications including data exfiltration, privilege escalation, and persistent access establishment. Organizations utilizing Windows Defender Application Control for application whitelisting may face scenarios where attackers bypass these security controls through the vulnerable OLE DB provider, undermining the intended protection mechanisms. The vulnerability's remote exploitability means that attackers do not require local system access to initiate attacks, making it particularly dangerous in networked environments where database services are exposed to external networks. Additionally, the attack surface expands when considering that many applications and services rely on OLE DB connections for data access, potentially allowing attackers to chain this vulnerability with other exploits or use it as a foothold for lateral movement within networks.
Mitigation strategies for this vulnerability should prioritize immediate patching of affected systems through Microsoft's regular security updates, with particular attention to the Windows Defender Application Control and SQL Server components. Organizations should implement network segmentation to limit access to database servers and restrict outbound connections from SQL Server instances to minimize potential attack vectors. Application whitelisting policies should be reviewed and enhanced to prevent execution of unauthorized binaries that might leverage the vulnerable OLE DB provider. Security monitoring should be enhanced to detect anomalous database connection patterns or unusual query execution that might indicate exploitation attempts. Additionally, implementing principle of least privilege for SQL Server service accounts and disabling unnecessary database connectivity features can significantly reduce the attack surface. The vulnerability's classification as a remote code execution flaw necessitates comprehensive incident response planning and network-wide vulnerability scanning to identify potentially affected systems. Organizations should also consider implementing database activity monitoring solutions that can detect and alert on suspicious OLE DB provider usage patterns, providing additional layers of defense beyond traditional perimeter security measures.