CVE-2019-1162
📋 TL;DR
CVE-2019-1162 is a Windows privilege escalation vulnerability in the Advanced Local Procedure Call (ALPC) mechanism. An attacker with local access can exploit this to execute arbitrary code with SYSTEM privileges, potentially gaining full control of the affected system. This affects Windows systems that haven't applied the security update.
💻 Affected Systems
- Microsoft Windows
📦 What is this software?
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
Attacker gains full SYSTEM privileges, installs persistent malware, creates backdoor accounts, and exfiltrates sensitive data from the entire system.
Likely Case
Attacker escalates from standard user to SYSTEM privileges, installs keyloggers or credential stealers, and moves laterally within the network.
If Mitigated
With proper patching and least privilege principles, impact is limited to isolated systems with minimal data exposure.
🎯 Exploit Status
Requires local authenticated access. Proof-of-concept code has been publicly released, making exploitation more accessible.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: August 2019 security updates (KB4512508 for Windows 10 1903, KB4512516 for Windows Server 2019, etc.)
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1162
Restart Required: Yes
Instructions:
1. Open Windows Update settings. 2. Check for updates. 3. Install August 2019 security updates. 4. Restart the system when prompted.
🔧 Temporary Workarounds
Restrict local user access
windowsLimit local user accounts to only necessary personnel and implement least privilege principles.
🧯 If You Can't Patch
- Implement strict access controls and limit local user accounts
- Monitor for suspicious process creation and privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check Windows version and compare with patched versions. Unpatched systems running affected Windows versions are vulnerable.Check Version:
winverVerify Fix Applied:
Verify that August 2019 security updates are installed via Windows Update history or by checking system version.📡 Detection & Monitoring
Log Indicators:
- Unusual process creation with SYSTEM privileges
- ALPC-related errors in Event Viewer
- Failed privilege escalation attempts
Network Indicators:
- Lateral movement from compromised systems
- Unusual outbound connections from previously low-privilege accounts
SIEM Query:
EventID=4688 AND NewProcessName contains 'cmd.exe' OR 'powershell.exe' AND SubjectUserName != SYSTEM AND TokenElevationType=2