CVE-2019-1388
📋 TL;DR
CVE-2019-1388 is a Windows privilege escalation vulnerability in the Certificate Dialog that allows attackers to bypass User Account Control (UAC) and execute code with SYSTEM privileges. It affects Windows users who can run arbitrary code with standard user privileges. This vulnerability enables local attackers to gain full system control.
💻 Affected Systems
- Microsoft Windows
📦 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 1709 by Microsoft
Windows 10 1709 by Microsoft
Windows 10 1709 by Microsoft
Windows 10 1803 by Microsoft
Windows 10 1803 by Microsoft
Windows 10 1803 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 1903 by Microsoft
Windows 10 1903 by Microsoft
Windows 10 1903 by Microsoft
Windows 7 by Microsoft
Windows 8.1 by Microsoft
Windows Rt 8.1 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Attacker gains full SYSTEM privileges, enabling complete system compromise, data theft, malware persistence, and lateral movement across the network.
Likely Case
Local attacker escalates from standard user to SYSTEM privileges, allowing installation of malware, credential theft, and bypassing security controls.
If Mitigated
With proper patching and UAC enabled, the attack surface is significantly reduced, though local code execution could still lead to limited impact.
🎯 Exploit Status
Exploit requires local user access and UAC enabled. Multiple public proof-of-concept exploits exist and have been used in real attacks.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: November 2019 security updates (KB4524570 for Windows 10 1903, KB4524570 for Windows Server 2019, etc.)
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1388
Restart Required: Yes
Instructions:
1. Apply November 2019 Windows security updates via Windows Update. 2. For enterprise environments, deploy patches through WSUS or SCCM. 3. Verify patch installation with 'wmic qfe list' command.
🔧 Temporary Workarounds
Disable UAC (Not Recommended)
windowsDisabling User Account Control prevents the vulnerability but significantly reduces security posture.
reg add HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
🧯 If You Can't Patch
- Implement least privilege access controls and restrict local administrator privileges
- Monitor for suspicious process creation and UAC bypass attempts using endpoint detection tools
🔍 How to Verify
Check if Vulnerable:
Check Windows version and patch level. If running affected Windows versions without November 2019 security updates, system is vulnerable.Check Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify KB4524570 or later November 2019 security updates are installed using 'wmic qfe list | findstr KB4524570' or check Windows Update history.📡 Detection & Monitoring
Log Indicators:
- Event ID 4688 with parent process 'consent.exe' and elevated privileges
- UAC bypass events in Windows Security logs
- Suspicious process creation from certificate dialog
Network Indicators:
- Not applicable - local privilege escalation
SIEM Query:
EventID=4688 AND ParentProcessName="consent.exe" AND NewProcessName="cmd.exe" OR NewProcessName="powershell.exe"🔗 References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1388
- https://www.zerodayinitiative.com/advisories/ZDI-19-975/
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1388
- https://www.zerodayinitiative.com/advisories/ZDI-19-975/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-1388
