CVE-2024-49009 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 • 02/27/2025
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 maliciously crafted database connections. This vulnerability impacts Microsoft SQL Server Native Client components that handle database connectivity operations, creating an attack surface where unauthenticated remote adversaries can exploit malformed input sequences to gain unauthorized system access. The flaw stems from improper handling of specific connection parameters and protocol interactions within the native client library implementation.
The technical root cause of this vulnerability lies in inadequate input validation and memory management within the SQL Server Native Client library. When processing database connection requests containing specially crafted parameters, the client fails to properly sanitize or validate incoming data structures, leading to potential buffer overflows or arbitrary code execution scenarios. The vulnerability specifically affects versions where the native client processes connection strings, authentication tokens, or protocol negotiation sequences without sufficient boundary checks or input sanitization mechanisms. This creates opportunities for attackers to inject malicious payloads that can be executed within the context of the SQL Server Native Client process.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass complete system compromise and data exfiltration capabilities. An attacker exploiting this flaw can gain elevated privileges on the target system, potentially escalating from a database connection context to full system administrator access depending on the execution environment. The vulnerability affects organizations using SQL Server Native Client for database connectivity across various applications including web applications, enterprise systems, and legacy database interfaces. Organizations with multiple database connections or those using older native client versions face heightened risk due to the widespread adoption of these components in enterprise environments.
Mitigation strategies for this vulnerability involve immediate patching of affected SQL Server Native Client installations through Microsoft security updates, along with network segmentation to limit access to database servers. Organizations should implement network monitoring to detect anomalous connection patterns or malformed connection requests that may indicate exploitation attempts. Additional protective measures include disabling unnecessary database connectivity features, implementing strict access controls for database connections, and maintaining up-to-date intrusion detection systems to identify potential exploitation activities. The vulnerability aligns with CWE-121 and CWE-125 categories related to buffer overflow conditions and improper access control mechanisms, while also mapping to ATT&CK techniques involving remote code execution through network services and privilege escalation via system access tokens.
Security teams should prioritize assessment of all systems utilizing SQL Server Native Client components and ensure comprehensive testing of patched environments before full deployment. Regular security audits of database connectivity configurations can help identify additional attack vectors that may compound the impact of this vulnerability. The remediation process requires careful coordination between database administrators, network security teams, and application developers to ensure complete protection across all affected systems while minimizing operational disruption during patch deployment cycles.