CVE-2020-0891 Explained : Impact and Mitigation

This CVE involves a vulnerability in Microsoft SharePoint servers allowing for reflective cross-site scripting attacks.

Understanding CVE-2020-0891

What is CVE-2020-0891?

This vulnerability arises when SharePoint Server fails to properly sanitize specific requests, enabling an authenticated attacker to exploit the server.

The Impact of CVE-2020-0891

The vulnerability poses a risk of spoofing, potentially allowing attackers to impersonate valid users and gain unauthorized access to sensitive information.

Technical Details of CVE-2020-0891

Vulnerability Description

The issue stems from a lack of proper request sanitization in affected Microsoft SharePoint servers, leading to the 'Microsoft SharePoint Reflective XSS Vulnerability'.

Affected Systems and Versions

Microsoft SharePoint Enterprise Server 2016
Microsoft SharePoint Server 2019
Microsoft SharePoint Foundation 2010 Service Pack 2
Microsoft SharePoint Foundation 2013 Service Pack 1

Exploitation Mechanism

By sending a carefully crafted request to an affected SharePoint server, authenticated attackers can leverage this vulnerability to execute a reflective cross-site scripting attack.

Mitigation and Prevention

Immediate Steps to Take

Implement the provided patch or security update from Microsoft.
Monitor network traffic for any suspicious activities.
Enforce strong authentication mechanisms to prevent unauthorized access.

Long-Term Security Practices

Regularly update SharePoint servers to the latest versions to patch known vulnerabilities.
Conduct security training for users to recognize and report suspicious activities promptly.

Patching and Updates

Apply the latest security updates and patches released by Microsoft for SharePoint servers to mitigate the risk of exploitation.