CVE-2024-37330 Overview
CVE-2024-37330 is a remote code execution vulnerability in the Microsoft SQL Server Native Client OLE DB Provider. The flaw affects SQL Server 2016, 2017, 2019, and 2022. Microsoft tracks the issue under [CWE-122] heap-based buffer overflow, indicating memory corruption within the OLE DB provider component. Exploitation requires a user to connect to an attacker-controlled SQL Server instance, after which the attacker can execute arbitrary code in the context of the client process.
Critical Impact
Successful exploitation grants remote code execution on the connecting client with full impact to confidentiality, integrity, and availability.
Affected Products
- Microsoft SQL Server 2016
- Microsoft SQL Server 2017
- Microsoft SQL Server 2019
- Microsoft SQL Server 2022
Discovery Timeline
- 2024-07-09 - CVE-2024-37330 published to NVD
- 2024-07-09 - Microsoft releases security update via the Microsoft CVE-2024-37330 Advisory
- 2024-11-21 - Last updated in NVD database
Technical Details for CVE-2024-37330
Vulnerability Analysis
The vulnerability resides in the SQL Server Native Client (SNAC) OLE DB Provider, the client-side library that applications use to communicate with SQL Server. The provider mishandles data returned by a SQL Server endpoint, producing a heap-based buffer overflow classified under [CWE-122]. An attacker who controls a malicious SQL Server instance can return crafted responses that corrupt heap memory in the connecting client process.
The attack vector is network-based, requires no privileges, and requires user interaction. The user must initiate a connection to the attacker-controlled server, typically through a database client, ETL job, or application that uses the legacy SNAC OLE DB driver. Once the malicious response is parsed, the attacker gains arbitrary code execution in the security context of the connecting application.
Root Cause
The root cause is improper validation of length or size fields in server-supplied data structures processed by the OLE DB provider. The provider writes attacker-controlled bytes into a fixed-size heap allocation, overflowing adjacent metadata or function pointers. Heap layout manipulation enables reliable control flow hijack.
Attack Vector
The attacker hosts a rogue SQL Server endpoint and lures a victim to connect, often through phishing, a poisoned connection string, or a compromised intermediary. When the client uses the SNAC OLE DB Provider, the malicious server returns a crafted Tabular Data Stream (TDS) response. Parsing the response triggers the heap overflow and executes the attacker's payload.
No verified public proof-of-concept code is available for CVE-2024-37330. Refer to the Microsoft CVE-2024-37330 Advisory for vendor-supplied technical context.
Detection Methods for CVE-2024-37330
Indicators of Compromise
- Outbound TDS connections (TCP/1433 or custom ports) from workstations or servers to unfamiliar external IP addresses.
- Unexpected child processes spawned by applications that load sqlncli11.dll or msoledbsql.dll.
- Crash events or Windows Error Reporting entries citing the SQL Server Native Client OLE DB provider modules.
- Newly created connection strings or ODBC/OLE DB data sources referencing untrusted hosts.
Detection Strategies
- Inventory endpoints that still load the legacy SNAC OLE DB provider and flag any unpatched versions.
- Hunt for process executions where Office, scripting hosts, or business applications load OLE DB provider DLLs followed by anomalous network egress.
- Monitor EDR telemetry for heap corruption signatures or exception events originating in OLE DB provider modules.
Monitoring Recommendations
- Alert on TDS traffic from client subnets to destinations outside approved database server ranges.
- Correlate user-initiated database client launches with connections to first-seen external SQL endpoints.
- Track installation or update activity of msoledbsql and sqlncli packages across the fleet.
How to Mitigate CVE-2024-37330
Immediate Actions Required
- Apply the July 2024 Microsoft security updates for all affected SQL Server versions listed in the vendor advisory.
- Block outbound TCP/1433 and other database protocol ports at the perimeter for hosts that do not need external database connectivity.
- Audit applications still using the deprecated SQL Server Native Client and plan migration to the supported Microsoft OLE DB Driver for SQL Server.
Patch Information
Microsoft published cumulative updates addressing CVE-2024-37330 across SQL Server 2016, 2017, 2019, and 2022. Update packages and build numbers are listed in the Microsoft CVE-2024-37330 Advisory. Apply the update matching each instance's branch and confirm the new build with SELECT @@VERSION after deployment.
Workarounds
- Restrict client systems to connect only to authorized internal SQL Server endpoints via firewall egress rules.
- Remove or disable the legacy SQL Server Native Client where not strictly required by applications.
- Train users to avoid opening database connection files or links from untrusted sources, since exploitation requires user interaction.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
