CVE-2019-1109 : Exploit Details and Defense Strategies

A vulnerability in Microsoft Office Javascript allows for spoofing, enabling attackers to gain unauthorized access to Office documents. The security update addresses this issue by enhancing the verification process of trusted web pages.

Understanding CVE-2019-1109

This CVE, also known as the 'Microsoft Office Spoofing Vulnerability,' affects various versions of Microsoft Office and Office 365 ProPlus.

What is CVE-2019-1109?

The vulnerability in Microsoft Office Javascript permits spoofing, where the validity of web pages requesting access to Office documents is not adequately verified. This loophole can be exploited by attackers to read or modify information within Office documents.

The Impact of CVE-2019-1109

If exploited, this vulnerability could lead to unauthorized access to sensitive information stored in Office documents, compromising data confidentiality and integrity.

Technical Details of CVE-2019-1109

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

The vulnerability arises from the lack of proper validation of web pages accessing Office documents, allowing attackers to spoof trusted web pages and gain unauthorized access.

Affected Systems and Versions

Microsoft Office 2013 Service Pack 1 (32-bit and 64-bit editions)
Microsoft Office 2013 RT Service Pack 1
Microsoft Office 2016 (32-bit and 64-bit editions)
Microsoft Office 2019 for 32-bit and 64-bit editions
Office 365 ProPlus on 32-bit and 64-bit Systems

Exploitation Mechanism

Attackers exploit the vulnerability by tricking Microsoft Office Javascript into accepting requests from malicious web pages, bypassing the verification process and gaining access to Office documents.

Mitigation and Prevention

Protect your systems from CVE-2019-1109 with these mitigation strategies:

Immediate Steps to Take

Apply the security update provided by Microsoft to fix the vulnerability.
Educate users about the risks of interacting with untrusted web pages requesting access to Office documents.

Long-Term Security Practices

Regularly update Microsoft Office to ensure you have the latest security patches.
Implement security awareness training to help users identify and report suspicious activities.

Patching and Updates

Stay informed about security updates from Microsoft and promptly apply patches to secure your systems.