CVE-2019-1090 : What You Need to Know

A security vulnerability known as 'Windows dnsrlvr.dll Elevation of Privilege Vulnerability' affects various versions of Windows and Windows Server.

Understanding CVE-2019-1090

What is CVE-2019-1090?

This vulnerability arises in the dnsrslvr.dll module's handling of memory objects, leading to an elevation of privilege.

The Impact of CVE-2019-1090

The vulnerability allows attackers to elevate privileges on affected systems, potentially leading to unauthorized access and control.

Technical Details of CVE-2019-1090

Vulnerability Description

The 'Windows dnsrlvr.dll Elevation of Privilege Vulnerability' occurs due to improper memory object handling in the dnsrslvr.dll module.

Affected Systems and Versions

Windows 10 Version 1803 for 32-bit, x64-based, and ARM64-based Systems
Windows 10 Version 1809 for 32-bit, x64-based, and ARM64-based Systems
Windows Server version 1803 (Core Installation), 2019, and 2019 (Core installation)
Windows 10 Version 1903 for 32-bit, x64-based, and ARM64-based Systems
Windows Server, version 1903 (Server Core installation)

Exploitation Mechanism

Attackers can exploit this vulnerability to manipulate memory objects, gaining elevated privileges on the affected systems.

Mitigation and Prevention

Immediate Steps to Take

Apply security patches provided by Microsoft promptly.
Monitor for any unauthorized access or unusual system behavior.
Implement the principle of least privilege to restrict user permissions.

Long-Term Security Practices

Regularly update and patch all software and systems.
Conduct security audits and vulnerability assessments periodically.
Educate users on cybersecurity best practices to prevent social engineering attacks.

Patching and Updates

Ensure that all affected systems are updated with the latest security patches from Microsoft.