CVE-2024-26159: Windows 10 1507 ODBC Driver RCE Flaw

CVE-2024-26159 Overview

CVE-2024-26159 is a remote code execution vulnerability in the Microsoft ODBC Driver shipped with supported versions of Windows and Windows Server. Microsoft disclosed the issue on March 12, 2024 as part of its monthly security update cycle. The flaw is classified as a heap-based buffer overflow [CWE-122] and allows attackers to execute arbitrary code in the context of the user invoking the vulnerable ODBC client. Exploitation requires user interaction, typically by convincing a target to connect to an attacker-controlled database server. The vulnerability affects a broad range of Microsoft operating systems, from Windows 10 1507 through Windows 11 23H2 and Windows Server 2008 through Windows Server 2022 23H2.

Critical Impact
Successful exploitation enables remote code execution on systems where a user is induced to connect a vulnerable ODBC client to a malicious SQL Server, leading to full compromise of confidentiality, integrity, and availability.

Affected Products

Microsoft Windows 10 (1507, 1607, 1809, 21H2, 22H2)
Microsoft Windows 11 (21H2, 22H2, 23H2)
Microsoft Windows Server 2008, 2012, 2016, 2019, 2022, and 2022 23H2

Discovery Timeline

2024-03-12 - CVE-2024-26159 published to NVD by Microsoft
2024-03-12 - Microsoft releases security patch via the March 2024 Patch Tuesday update guide
2024-12-05 - Last updated in NVD database

Technical Details for CVE-2024-26159

Vulnerability Analysis

The vulnerability resides in the Microsoft ODBC Driver, the component that Windows applications use to establish connections with SQL Server and other databases through the Open Database Connectivity (ODBC) API. The flaw is a heap-based buffer overflow [CWE-122] triggered while the client driver processes data returned from a database server. When a vulnerable client connects to an attacker-controlled SQL Server, the malicious server can return crafted response data that overruns a heap buffer in the driver. The overflow corrupts adjacent heap memory and can be steered toward arbitrary code execution in the process loading the ODBC driver. Because the ODBC Driver is widely embedded in business applications, management tools, and middleware, the attack surface extends far beyond standalone SQL clients.

Root Cause

The root cause is improper validation of length or structure information in server-supplied data, which leads to a write beyond the bounds of a heap allocation inside the ODBC client driver. Heap metadata or adjacent object pointers can be overwritten, enabling control-flow hijack primitives.

Attack Vector

The attack vector is network-based but requires user interaction. An attacker hosts a malicious database endpoint and convinces a target user, through phishing or a poisoned connection string, to initiate an ODBC connection to that endpoint. No prior authentication to the target system is required. Once the connection is established, the malicious server returns crafted packets that trigger the heap overflow in the client driver.

No public proof-of-concept code is available for CVE-2024-26159. Refer to the Microsoft CVE-2024-26159 Update Guide for vendor-supplied technical details.

Detection Methods for CVE-2024-26159

Indicators of Compromise

Outbound TCP connections from workstations or servers to unexpected SQL Server endpoints (default port 1433 or custom ports) outside the approved database inventory.
Crashes or unexpected termination of processes loading msodbcsql*.dll or sqlncli*.dll, especially with heap corruption exceptions.
Child processes such as cmd.exe, powershell.exe, or rundll32.exe spawned from applications that host ODBC clients.
DNS lookups for unknown database hostnames originating from end-user endpoints.

Detection Strategies

Hunt for processes loading the Microsoft ODBC Driver modules and subsequently establishing connections to non-corporate IP ranges.
Correlate Windows Error Reporting and WER crash dumps that reference ODBC driver modules with subsequent suspicious process activity.
Use EDR telemetry to flag unusual parent-child process chains where ODBC-enabled applications launch interpreters or scripting hosts.

Monitoring Recommendations

Inventory hosts running unpatched ODBC Driver versions and prioritize them for monitoring until remediated.
Enable PowerShell and Sysmon logging to capture module loads, network connections, and process creation tied to ODBC client activity.
Alert on outbound SQL Server connections that bypass corporate database gateways or proxies.

How to Mitigate CVE-2024-26159

Immediate Actions Required

Apply the March 2024 Microsoft security update for all affected Windows and Windows Server versions listed in the advisory.
Identify and update embedded or redistributable Microsoft ODBC Driver components inside third-party applications and management tools.
Restrict outbound traffic on TCP port 1433 and other database ports to an allowlist of approved internal database servers.
Educate users to refuse connection prompts to untrusted database servers and to validate connection strings received via email or chat.

Patch Information

Microsoft released fixes for CVE-2024-26159 through the March 2024 Patch Tuesday cycle. Patch availability, build numbers, and update KB articles for each affected Windows and Windows Server version are listed in the Microsoft CVE-2024-26159 Update Guide. Administrators should deploy the corresponding cumulative update for each OS version in their estate.

Workarounds

Block outbound connections to untrusted database endpoints at perimeter firewalls and host-based firewalls until patches are deployed.
Disable or uninstall the Microsoft ODBC Driver on systems that do not require database connectivity.
Enforce application allowlisting to prevent unauthorized applications from invoking the ODBC client stack.

bash

# Example: block outbound SQL Server traffic on Windows hosts using netsh
netsh advfirewall firewall add rule name="Block Outbound SQL 1433" ^
    dir=out action=block protocol=TCP remoteport=1433