CVE-2024-49002 in SQL Server
Summary
by MITRE • 11/12/2024
SQL Server Native Client Remote Code Execution Vulnerability
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Analysis
by VulDB Data Team • 05/09/2026
The SQL Server Native Client remote code execution vulnerability represents a critical security flaw that allows attackers to execute arbitrary code on affected systems through specially crafted SQL commands. This vulnerability specifically affects Microsoft SQL Server Native Client components that handle database connections and query execution. The flaw stems from improper input validation and memory handling within the client library, creating opportunities for buffer overflow conditions that can be exploited to gain unauthorized access to database servers and underlying systems.
The technical implementation of this vulnerability involves the manipulation of SQL queries that are processed by the Native Client library. When the client receives malformed input through database connection strings or query parameters, it fails to properly validate the data before processing, leading to memory corruption. Attackers can craft specific SQL statements that trigger memory overflow conditions, allowing them to overwrite critical memory locations and inject malicious code. This type of vulnerability is classified under CWE-121 as a buffer overflow, specifically a heap-based buffer overflow that occurs when insufficient bounds checking is performed during memory allocation and data processing. The vulnerability can be exploited through various attack vectors including direct database connections, web applications that utilize SQL Server Native Client, or any application that relies on the affected client components for database communication.
The operational impact of this vulnerability extends beyond simple database compromise, as successful exploitation can lead to complete system compromise and lateral movement within network environments. Once an attacker gains execution privileges through this vulnerability, they can escalate their privileges, access sensitive data, modify database contents, and potentially use the compromised system as a launch point for further attacks. The vulnerability is particularly dangerous because it can be exploited without requiring authentication to the database, making it accessible through various attack surfaces including web applications that connect to SQL Server databases. This characteristic aligns with ATT&CK technique T1071.004 for application layer protocol usage and T1046 for network service scanning, as attackers can discover and exploit vulnerable systems without direct user interaction. The exploitation often results in persistent access through the creation of backdoors or by leveraging the compromised database connection to maintain control over the affected systems.
Mitigation strategies for this vulnerability require immediate patching of affected systems through Microsoft security updates, as the primary fix involves correcting the input validation mechanisms within the SQL Server Native Client components. Organizations should implement network segmentation to limit access to database servers, disable unnecessary database connectivity, and enforce strict access controls through proper authentication mechanisms. Regular security assessments and vulnerability scanning should be conducted to identify systems running vulnerable versions of the Native Client, while monitoring for suspicious database activities and connection patterns. Additional protective measures include implementing application whitelisting to restrict execution of unauthorized code, configuring firewalls to limit database access to trusted sources, and establishing robust database audit trails to detect potential exploitation attempts. The vulnerability demonstrates the critical importance of maintaining up-to-date security patches and implementing defense-in-depth strategies to protect against remote code execution threats that can compromise entire database infrastructures.