CVE-2019-1338 : Security Advisory and Response

A security feature bypass vulnerability exists in Microsoft Windows allowing an attacker to bypass NTLMv2 protection during communication.

Understanding CVE-2019-1338

What is CVE-2019-1338?

There is a vulnerability in Microsoft Windows where an attacker can bypass NTLMv2 protection during communication, known as the 'Windows NTLM Security Feature Bypass Vulnerability.'

The Impact of CVE-2019-1338

This vulnerability could be exploited by a man-in-the-middle attacker to bypass NTLMv2 protection if the client is sending LMv2 responses.

Technical Details of CVE-2019-1338

Vulnerability Description

The vulnerability allows attackers to bypass NTLMv2 protection in Windows, compromising security.

Affected Systems and Versions

Windows 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Core installation)
Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2008 for 32-bit Systems Service Pack 2 (Core installation)
Windows Server 2008 for Itanium-Based Systems Service Pack 2
Windows Server 2008 for 32-bit Systems Service Pack 2
Windows Server 2008 for x64-based Systems Service Pack 2
Windows Server 2008 for x64-based Systems Service Pack 2 (Core installation)

Exploitation Mechanism

The vulnerability allows a man-in-the-middle attacker to bypass NTLMv2 protection by intercepting and modifying communication.

Mitigation and Prevention

Immediate Steps to Take

Apply security updates provided by Microsoft promptly.
Disable LMv2 responses to prevent exploitation.

Long-Term Security Practices

Implement network segmentation to limit the impact of potential attacks.
Use strong authentication methods to enhance security.

Patching and Updates

Regularly check for and apply security patches and updates to ensure system protection.