CVE-2024-38087 in SQL Server
Summary
by MITRE • 07/09/2024
SQL Server Native Client OLE DB Provider Remote Code Execution Vulnerability
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Analysis
by VulDB Data Team • 05/16/2026
This vulnerability resides in the SQL Server Native Client OLE DB Provider component which is part of Microsoft's database connectivity stack designed for applications to access sql server data through odbc and ole db interfaces. The flaw represents a remote code execution vulnerability that allows attackers to execute arbitrary code on affected systems when the provider processes specially crafted data. The vulnerability stems from improper input validation within the provider's handling of certain data types and connection parameters, creating an avenue for attackers to inject malicious code that gets executed with the privileges of the sql server service account. According to cwe-121, this represents a classic buffer overflow condition where insufficient bounds checking allows attackers to overwrite memory locations and potentially redirect program execution flow. The attack typically involves crafting malicious connection strings or data payloads that trigger the vulnerable code path when the provider attempts to process them. This vulnerability is particularly dangerous because it can be exploited remotely without authentication, making it a prime target for automated exploitation campaigns. The impact extends beyond simple code execution as attackers can leverage this to establish persistent access, escalate privileges, and move laterally within the network infrastructure. Organizations running sql server environments with affected native client versions are at significant risk, particularly those with exposed sql server instances or applications that dynamically construct connection strings from user input. The vulnerability aligns with attack techniques described in the attack pattern taxonomy under cwe-74, which covers injection flaws where attackers manipulate input to cause unintended behavior in applications. This type of vulnerability affects database connectivity applications, middleware components, and any software that relies on the sql server native client for data access operations.
The technical exploitation of this vulnerability requires attackers to craft specific data inputs that trigger the buffer overflow condition within the oledb provider. When the provider processes these malicious inputs, it can lead to memory corruption that allows attackers to inject and execute shellcode. The vulnerability exists in the data processing logic that handles connection parameters, query results, or data type conversions within the native client library. Attackers can leverage this through various attack vectors including web applications that use sql server connectivity, desktop applications with sql server integration, or any system that utilizes the affected provider. The remote nature of the vulnerability means that attackers do not need physical access to the system or local network presence to exploit it. The exploitation process typically involves sending specially crafted data to a sql server instance that uses the vulnerable native client provider, causing the provider to execute the malicious code within the context of the sql server process. This creates a severe security risk as sql server processes often run with elevated privileges, potentially allowing attackers to gain system-level access or database administrator privileges. The vulnerability affects multiple versions of sql server native client components and can be particularly problematic in environments where applications dynamically construct connection strings or where user input is not properly sanitized before being passed to the provider.
Organizations facing this vulnerability must implement immediate mitigation strategies to protect their sql server environments from exploitation attempts. The primary defense involves applying microsoft security updates and patches that address the specific buffer overflow conditions within the native client provider. System administrators should also implement network segmentation to limit access to sql server instances and restrict the attack surface by disabling unnecessary connectivity options. Additionally, implementing strict input validation and sanitization within applications that utilize sql server connectivity can prevent malicious data from reaching the vulnerable provider components. Database administrators should review and restrict sql server service account privileges to minimize the impact of successful exploitation attempts. Monitoring and logging of sql server connectivity activities, particularly unusual connection patterns or data processing operations, can help detect exploitation attempts. Organizations should also consider implementing application whitelisting controls to restrict which applications can access sql server components and prevent unauthorized code execution. The vulnerability's classification under cwe-121 and its alignment with attack techniques from the attack pattern taxonomy highlight the need for comprehensive defensive measures that address both the immediate technical flaw and broader security architecture considerations. Regular security assessments of sql server environments, including vulnerability scanning and penetration testing, are essential to identify and remediate similar issues before they can be exploited by malicious actors.