CVE-2024-35256 in SQL Server
Summary
by MITRE • 07/09/2024
SQL Server Native Client OLE DB Provider Remote Code Execution Vulnerability
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 03/20/2025
This vulnerability affects the SQL Server Native Client OLE DB Provider component which is commonly used for database connectivity in enterprise environments. The flaw exists in how the provider handles certain input parameters during remote connections, creating an opportunity for malicious actors to execute arbitrary code on affected systems. The vulnerability stems from improper validation of user-supplied data within the provider's processing logic, allowing attackers to craft specially crafted OLE DB connection strings that trigger memory corruption conditions. This type of vulnerability falls under CWE-121 which describes heap-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations.
The operational impact of this vulnerability is significant as it enables remote code execution without authentication requirements, making it particularly dangerous in enterprise networks where database servers are often accessible from multiple network segments. Attackers can leverage this weakness by establishing OLE DB connections with maliciously crafted parameters that cause the provider to execute unintended code within the context of the SQL Server service account. This could result in complete system compromise, data exfiltration, or lateral movement throughout the network infrastructure. The vulnerability is particularly concerning because it affects widely deployed database connectivity components and can be exploited from external network positions.
From a threat modeling perspective, this vulnerability aligns with ATT&CK technique T1071.004 which describes application layer protocol usage for command and control communications. The attack chain typically involves initial reconnaissance to identify systems running vulnerable SQL Server Native Client components followed by exploitation using crafted connection strings that trigger the memory corruption. Organizations should implement network segmentation to limit access to database servers and ensure that only authorized applications can establish OLE DB connections with the affected provider. Regular patching of Microsoft SQL Server components is essential as this vulnerability requires immediate remediation through official security updates.
The technical exploitation requires understanding of how OLE DB providers handle connection string parameters and their internal memory management mechanisms. Attackers often use techniques such as heap spraying or return-oriented programming to achieve code execution in the target process memory space. Security teams should monitor for unusual OLE DB connection patterns and implement application whitelisting policies that restrict which applications can utilize the vulnerable provider component. Additionally, disabling unnecessary database connectivity features and implementing strong access controls around database servers provides additional defense-in-depth measures against this type of exploitation. Organizations must also consider the broader implications of this vulnerability in relation to their overall security posture and ensure appropriate incident response procedures are in place for potential exploitation events.