CVE-2020-1456 Explained : Impact and Mitigation

Microsoft SharePoint Server XSS Vulnerability

Understanding CVE-2020-1456

A cross-site-scripting (XSS) vulnerability in Microsoft SharePoint Server could allow an attacker to execute malicious scripts on the victim's browser.

What is CVE-2020-1456?

This CVE is associated with a specific XSS vulnerability in Microsoft SharePoint Server that occurs due to improper sanitization of web requests.

The Impact of CVE-2020-1456

Successful exploitation could lead to unauthorized access, data theft, or complete system compromise.
Attackers can execute arbitrary scripts in the context of the user's browser session, leading to further attacks.

Technical Details of CVE-2020-1456

Vulnerability Description

The vulnerability arises from the failure to properly sanitize crafted web requests.

Affected Systems and Versions

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

Exploitation Mechanism

Attackers craft specially designed web requests to inject malicious scripts into the SharePoint server, exploiting the XSS vulnerability.

Mitigation and Prevention

Immediate Steps to Take

Apply the latest security updates provided by Microsoft for the affected versions.
Implement proper input validation mechanisms to sanitize user inputs and prevent XSS attacks.

Long-Term Security Practices

Regularly monitor and audit the SharePoint server for any suspicious activities.
Train users and administrators on recognizing and avoiding clicking on malicious links.

Patching and Updates

Stay informed about security bulletins and CVEs related to Microsoft SharePoint Server.