CVE-2019-0858 : Security Advisory and Response

Microsoft Exchange Server has a vulnerability that allows spoofing when Outlook Web Access (OWA) does not handle web requests correctly. This vulnerability is known as the 'Microsoft Exchange Spoofing Vulnerability' and is distinct from CVE-2019-0817.

Understanding CVE-2019-0858

This CVE affects various versions of Microsoft Exchange Server, leading to a spoofing vulnerability.

What is CVE-2019-0858?

A spoofing vulnerability in Microsoft Exchange Server occurs when OWA fails to handle web requests properly.

The Impact of CVE-2019-0858

The vulnerability allows attackers to spoof user identities, potentially leading to unauthorized access and phishing attacks.

Technical Details of CVE-2019-0858

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability in Microsoft Exchange Server allows for spoofing attacks due to improper handling of web requests by OWA.

Affected Systems and Versions

Microsoft Exchange Server 2019
Microsoft Exchange Server 2016 (Cumulative Update 11, Cumulative Update 12)
Microsoft Exchange Server 2013 (Cumulative Update 22)
Microsoft Exchange Server 2019 (Cumulative Update 1)

Exploitation Mechanism

Attackers can exploit this vulnerability to impersonate legitimate users and potentially gain unauthorized access to sensitive information.

Mitigation and Prevention

Protecting systems from CVE-2019-0858 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply security patches provided by Microsoft promptly.
Monitor for any suspicious activities indicating spoofing attempts.

Long-Term Security Practices

Regularly update and patch Microsoft Exchange Server to address security vulnerabilities.
Educate users on identifying phishing attempts and practicing safe email habits.

Patching and Updates

Stay informed about security updates and patches released by Microsoft for Microsoft Exchange Server.