CVE-2024-28940
📋 TL;DR
This vulnerability in Microsoft OLE DB Driver for SQL Server allows remote attackers to execute arbitrary code on affected systems by sending specially crafted requests. It affects applications using the vulnerable driver to connect to SQL Server databases. The vulnerability is exploitable without authentication in certain configurations.
💻 Affected Systems
- Microsoft OLE DB Driver for SQL Server
📦 What is this software?
Sql Server 2019 by Microsoft
Sql Server 2019 by Microsoft
Sql Server 2022 by Microsoft
Sql Server 2022 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining SYSTEM/administrator privileges, enabling data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Attacker gains initial foothold on database server, then pivots to other systems in the network, potentially leading to data exfiltration or lateral movement.
If Mitigated
Attack blocked at network perimeter or detected by security controls before code execution occurs.
🎯 Exploit Status
CWE-122 indicates heap-based buffer overflow, which typically requires specific conditions to exploit reliably.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft Security Update Guide for specific version
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-28940
Restart Required: Yes
Instructions:
1. Download latest OLE DB Driver from Microsoft Download Center
2. Stop applications using the driver
3. Install updated driver
4. Restart affected services/systems
5. Test application connectivity
🔧 Temporary Workarounds
Network Segmentation
windowsRestrict network access to SQL Server ports (1433, 1434) to only trusted sources
Windows Firewall: New-NetFirewallRule -DisplayName "Block SQL Ports" -Direction Inbound -LocalPort 1433,1434 -Protocol TCP -Action Block
Application Whitelisting
allPrevent execution of unauthorized binaries that might be dropped by exploit
🧯 If You Can't Patch
- Implement strict network segmentation to isolate SQL Server from untrusted networks
- Deploy intrusion prevention systems (IPS) with rules to detect and block exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check OLE DB Driver version against patched versions in Microsoft advisoryCheck Version:
Windows: Check driver properties in ODBC Data Source Administrator or registry HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSOLEDBSQLVerify Fix Applied:
Verify installed OLE DB Driver version matches or exceeds patched version📡 Detection & Monitoring
Log Indicators:
- Unusual process creation from SQL Server service
- Failed authentication attempts followed by buffer overflow patterns
- Windows Event ID 4688 with suspicious parent process
Network Indicators:
- Unusual SQL protocol traffic patterns
- Connection attempts to SQL Server from unexpected sources
- Large or malformed SQL packets
SIEM Query:
source="windows" EventCode=4688 (NewProcessName=*cmd* OR NewProcessName=*powershell*) AND ParentProcessName="sqlservr.exe"