CVE-2024-21353
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on systems running Microsoft's WDAC ODBC Driver. Attackers can exploit this heap-based buffer overflow to gain SYSTEM privileges on affected Windows systems. Organizations using Microsoft WDAC with ODBC connectivity are at risk.
💻 Affected Systems
- Microsoft WDAC ODBC Driver
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with SYSTEM privileges, enabling data theft, ransomware deployment, and complete control over the affected system.
Likely Case
Privilege escalation leading to lateral movement within the network, credential harvesting, and installation of persistent backdoors.
If Mitigated
Limited impact with proper network segmentation, application allowlisting, and privilege separation preventing successful exploitation.
🎯 Exploit Status
Exploitation requires the attacker to have some level of access to trigger the buffer overflow. No public exploits have been reported as of the advisory date.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: February 2024 security updates (KB5034765 for Windows 11, KB5034763 for Windows 10, etc.)
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21353
Restart Required: Yes
Instructions:
1. Apply the February 2024 security updates from Microsoft Update. 2. For enterprise environments, deploy through WSUS or Microsoft Endpoint Configuration Manager. 3. Restart affected systems after patch installation.
🔧 Temporary Workarounds
Disable WDAC ODBC Driver
windowsTemporarily disable the vulnerable driver if patching is not immediately possible
sc config wdacodbc start= disabled
sc stop wdacodbc
Network Segmentation
allRestrict network access to systems using WDAC ODBC Driver
🧯 If You Can't Patch
- Implement strict network segmentation to isolate systems using WDAC ODBC Driver
- Apply Windows Defender Application Control policies to restrict execution of unauthorized code
🔍 How to Verify
Check if Vulnerable:
Check if the February 2024 security updates are installed via 'wmic qfe list' or 'Get-Hotfix' in PowerShellCheck Version:
wmic service where name='wdacodbc' get name,pathnameVerify Fix Applied:
Verify the security update KB number is present in installed updates and the WDAC ODBC Driver service is running the patched version📡 Detection & Monitoring
Log Indicators:
- Event ID 4688 with wdacodbc.exe in command line
- Unexpected process creation from wdacodbc.exe
- Heap corruption errors in Application logs
Network Indicators:
- Unusual ODBC connection attempts to database servers
- Anomalous network traffic from systems running WDAC
SIEM Query:
source="windows" AND (process_name="wdacodbc.exe" AND (parent_process!="services.exe" OR command_line="*overflow*"))