CVE-2024-26244
📋 TL;DR
This vulnerability in Microsoft WDAC OLE DB provider for SQL Server allows remote attackers to execute arbitrary code on affected systems by sending specially crafted requests. It affects systems running vulnerable versions of Microsoft SQL Server with WDAC OLE DB provider enabled. Successful exploitation could lead to complete system compromise.
💻 Affected Systems
- Microsoft SQL Server
📦 What is this software?
Windows 10 1507 by Microsoft
Windows 10 1507 by Microsoft
Windows 10 1607 by Microsoft
Windows 10 1607 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 21h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 11 21h2 by Microsoft
Windows 11 22h2 by Microsoft
Windows 11 23h2 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with administrative privileges, data exfiltration, lateral movement across network, and persistent backdoor installation.
Likely Case
Attacker gains code execution with SQL Server service account privileges, enabling database manipulation, credential theft, and potential privilege escalation.
If Mitigated
Limited impact due to network segmentation, proper authentication requirements, and minimal service account privileges.
🎯 Exploit Status
Exploitation requires network access to SQL Server and likely some level of authentication. No public exploit code available at time of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft Security Update Guide for specific patch versions
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-26244
Restart Required: Yes
Instructions:
1. Apply latest Microsoft SQL Server security updates from Windows Update or Microsoft Update Catalog. 2. Restart SQL Server services. 3. Verify patch installation via version check.
🔧 Temporary Workarounds
Disable WDAC OLE DB provider
windowsTemporarily disable the vulnerable component if not required for operations
-- Requires SQL Server configuration changes via SQL Server Configuration Manager or T-SQL
Network segmentation
windowsRestrict network access to SQL Server ports (default 1433) using firewalls
netsh advfirewall firewall add rule name="Block SQL Port" dir=in action=block protocol=TCP localport=1433
🧯 If You Can't Patch
- Implement strict network access controls to limit SQL Server exposure
- Apply principle of least privilege to SQL Server service accounts and database users
🔍 How to Verify
Check if Vulnerable:
Check SQL Server version and compare against patched versions in Microsoft advisory. Review if WDAC OLE DB provider is enabled.Check Version:
SELECT @@VERSION;Verify Fix Applied:
Verify SQL Server version matches patched version from Microsoft advisory. Check Windows Update history for SQL Server security updates.📡 Detection & Monitoring
Log Indicators:
- Unusual SQL Server error logs related to OLE DB provider
- Failed authentication attempts followed by successful connections
- Unusual process creation from SQL Server service account
Network Indicators:
- Unusual traffic patterns to SQL Server port 1433
- Suspicious SQL queries or connection attempts
SIEM Query:
source="sql_server_logs" AND (error_code="*OLE*" OR error_code="*WDAC*") OR process_name="sqlservr.exe" AND parent_process!="expected_parent"