CVE-2020-1025 : What You Need to Know

Microsoft Office Elevation of Privilege Vulnerability was published on July 14, 2020, and affects various Microsoft products. The vulnerability allows attackers to bypass authentication and gain improper access.

Understanding CVE-2020-1025

This CVE impacts Microsoft SharePoint Server and Skype for Business Server, leading to an elevation of privilege vulnerability.

What is CVE-2020-1025?

An elevation of privilege vulnerability in Microsoft SharePoint Server and Skype for Business Server allows attackers to modify tokens, bypass authentication, and gain unauthorized access.

The Impact of CVE-2020-1025

Attackers exploiting this vulnerability can achieve improper access by bypassing authentication mechanisms, potentially leading to unauthorized system control and data compromise.

Technical Details of CVE-2020-1025

This section dives into the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability arises from the improper handling of OAuth token validation, enabling attackers to manipulate tokens and gain unauthorized access.

Affected Systems and Versions

Microsoft Skype for Business Server 2019 CU2 version 7.0.0
Skype for Business Server 2015 CU 8 version 2015 CU 8
Microsoft Lync Server 2013 version 0
Microsoft SharePoint Enterprise Server 2016 version 16.0.0
Microsoft SharePoint Server 2019 version 16.0.0
Microsoft SharePoint Foundation 2013 Service Pack 1 version 15.0.0

Exploitation Mechanism

To exploit this vulnerability, attackers need to modify OAuth tokens to bypass authentication mechanisms, thus gaining unauthorized system access.

Mitigation and Prevention

Protecting systems from CVE-2020-1025 requires immediate actions and long-term security measures.

Immediate Steps to Take

Apply the security update provided by Microsoft to address the vulnerability.
Monitor and audit token validation processes to detect anomalies.

Long-Term Security Practices

Implement multi-factor authentication to enhance access control.
Regularly update and patch Microsoft products to prevent known vulnerabilities.

Patching and Updates

Microsoft has released an update that addresses the vulnerability by enhancing token validation processes in SharePoint and Skype for Business Servers.