CVE-2019-1155
📋 TL;DR
This is a remote code execution vulnerability in the Windows Jet Database Engine that allows attackers to execute arbitrary code on vulnerable systems. It affects Windows systems with the vulnerable Jet Database Engine component and requires user interaction via opening a malicious file.
💻 Affected Systems
- Windows Jet Database Engine
📦 What is this software?
Office by Microsoft
Office by Microsoft
Office by Microsoft
Office by Microsoft
Office by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 7 by Microsoft
Windows 8.1 by Microsoft
Windows Rt 8.1 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control over the victim's machine, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Malware installation or data exfiltration through social engineering attacks where users open malicious files.
If Mitigated
Limited impact with proper patching and user education preventing successful exploitation.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file). No public exploit code was widely reported at disclosure.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: July 2019 security updates for Windows
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1155
Restart Required: Yes
Instructions:
1. Apply July 2019 Windows security updates via Windows Update. 2. For enterprise environments, deploy patches through WSUS or SCCM. 3. Restart systems after patch installation.
🔧 Temporary Workarounds
Disable Jet Database Engine
windowsRemove or disable the Jet Database Engine component if not required
Uninstall via Programs and Features or using DISM commands
Application Control
windowsUse application whitelisting to prevent execution of unauthorized applications
🧯 If You Can't Patch
- Implement strict email filtering to block malicious attachments
- Educate users about risks of opening untrusted files and implement least privilege
🔍 How to Verify
Check if Vulnerable:
Check Windows Update history for July 2019 security updates or use systeminfo command to verify OS build versionCheck Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify July 2019 security updates are installed via Windows Update history or check OS build version against patched versions📡 Detection & Monitoring
Log Indicators:
- Unexpected process creation from Office applications or file handlers
- Crash logs from Jet Database Engine processes
Network Indicators:
- Outbound connections from unexpected processes following file opening
SIEM Query:
Process creation where parent process includes excel.exe, winword.exe, or explorer.exe and child process is unusual