CVE-2024-21353: Microsoft WDAC ODBC Driver RCE Vulnerability

CVE-2024-21353 Overview

CVE-2024-21353 is a remote code execution vulnerability in the Microsoft Windows Data Access Components (WDAC) Open Database Connectivity (ODBC) Driver. The flaw affects Windows Server 2022 23H2 and is classified as a heap-based buffer overflow [CWE-122]. An attacker who successfully exploits this vulnerability can execute arbitrary code on the target system with the privileges of the user who initiated the connection.

Exploitation requires user interaction, typically by inducing a victim to connect to a malicious database server. The vulnerability carries network attack characteristics and impacts confidentiality, integrity, and availability.

Critical Impact
Successful exploitation allows remote attackers to execute arbitrary code on affected Windows Server 2022 23H2 systems, potentially leading to full host compromise.

Affected Products

Microsoft Windows Server 2022 23H2
Microsoft WDAC ODBC Driver component
Systems using ODBC connections to untrusted database sources

Discovery Timeline

2024-02-13 - CVE-2024-21353 published to the National Vulnerability Database
2024-02-13 - Microsoft released a security update addressing the vulnerability
2024-11-21 - Last updated in NVD database

Technical Details for CVE-2024-21353

Vulnerability Analysis

The vulnerability resides in the Windows Data Access Components ODBC driver, which provides a standardized interface for applications to interact with database management systems. The flaw is a heap-based buffer overflow [CWE-122] in the driver code that processes responses from a database server.

When an ODBC client connects to a server, the driver parses server-supplied data structures. Improper bounds checking allows attacker-controlled data to overflow a heap buffer, corrupting adjacent memory. An attacker who controls the server response can shape the overflow to overwrite function pointers or other control structures, achieving arbitrary code execution in the context of the application initiating the ODBC connection.

Root Cause

The root cause is insufficient validation of length or size fields in data returned by a remote database server before copying that data into a fixed-size heap allocation. The WDAC ODBC driver trusts server-supplied metadata, allowing oversized payloads to corrupt the heap.

Attack Vector

The attack vector is network-based but requires user interaction. An attacker must convince a victim to initiate an ODBC connection to an attacker-controlled database server, for example by sending a connection string, a database client configuration file, or a document that triggers an ODBC query. Once the client connects, the malicious server returns crafted response packets that trigger the heap overflow inside the WDAC ODBC driver.

No verified proof-of-concept code is publicly available. The vulnerability mechanism is described in prose only — refer to the Microsoft Security Update Guide for vendor technical details.

Detection Methods for CVE-2024-21353

Indicators of Compromise

Unexpected crashes of processes that load the WDAC ODBC driver, often visible as access violations in Windows Error Reporting.
Outbound ODBC or SQL-protocol connections from workstations or servers to untrusted external IP addresses.
New or unusual child processes spawned by applications that legitimately use ODBC, such as office productivity tools or reporting clients.
Suspicious DSN (Data Source Name) entries in the registry under HKLM\SOFTWARE\ODBC pointing to external hosts.

Detection Strategies

Monitor process telemetry for memory corruption signatures, such as exception codes 0xC0000374 (heap corruption) or 0xC0000005 (access violation) in ODBC-linked processes.
Hunt for command-line invocations referencing ODBC connection strings that point to unfamiliar remote endpoints.
Inspect EDR-recorded module loads of odbc32.dll and related WDAC components alongside outbound network connections to non-standard SQL ports.

Monitoring Recommendations

Enable Windows Defender Exploit Guard and audit logs for heap corruption events on servers running database client workloads.
Forward Sysmon Event ID 1 (process create) and Event ID 3 (network connect) to a centralized SIEM for correlation with ODBC driver activity.
Track patch deployment status for the February 2024 Microsoft security updates across the Windows Server 2022 23H2 estate.

How to Mitigate CVE-2024-21353

Immediate Actions Required

Apply the Microsoft security update for CVE-2024-21353 to all Windows Server 2022 23H2 systems without delay.
Inventory all systems and applications that rely on the WDAC ODBC driver to prioritize patching.
Restrict outbound network access from servers and workstations to only known, trusted database endpoints.
Educate users on the risk of opening files or connection profiles received from untrusted sources.

Patch Information

Microsoft addressed CVE-2024-21353 in its February 2024 Patch Tuesday release. Administrators should consult the Microsoft Security Update Guide for the specific KB articles applicable to their build of Windows Server 2022 23H2 and deploy through Windows Update, WSUS, or other patch management tooling.

Workarounds

Block outbound TCP traffic on database service ports (for example, 1433 for SQL Server) at the perimeter firewall, except to approved internal database hosts.
Disable or remove unused ODBC data sources defined in the system DSN registry to reduce the exposed connection surface.
Enforce application allow-listing to prevent untrusted applications from loading the WDAC ODBC driver.

bash

# Configuration example: list installed ODBC drivers and DSNs for audit
reg query "HKLM\SOFTWARE\ODBC\ODBCINST.INI\ODBC Drivers"
reg query "HKLM\SOFTWARE\ODBC\ODBC.INI"

# Verify the February 2024 update is installed
wmic qfe list brief /format:table | findstr /i "2024"