CVE-2021-28474 : Exploit Details and Defense Strategies

This article provides detailed information about the Microsoft SharePoint Server Remote Code Execution Vulnerability (CVE-2021-28474) disclosed on May 11, 2021.

Understanding CVE-2021-28474

This section delves into the nature of the vulnerability and its potential impact.

What is CVE-2021-28474?

The CVE-2021-28474 is a Remote Code Execution vulnerability affecting Microsoft SharePoint Server, allowing an attacker to execute arbitrary code on the target system.

The Impact of CVE-2021-28474

With a base severity of HIGH and a CVSS score of 8.8, this vulnerability poses a significant risk to systems running affected versions of Microsoft SharePoint Server.

Technical Details of CVE-2021-28474

This section provides insights into the specifics of the vulnerability.

Vulnerability Description

The vulnerability allows attackers to remotely execute code on vulnerable Microsoft SharePoint Server instances, potentially leading to full system compromise.

Affected Systems and Versions

Microsoft SharePoint Enterprise Server 2016: Versions 16.0.0 to 16.0.5161.1000
Microsoft SharePoint Server 2019: Versions 16.0.0 to 16.0.10374.20000
Microsoft SharePoint Foundation 2013 Service Pack 1: Versions 15.0.0 to 15.0.5345.1000

Exploitation Mechanism

Attackers can exploit this vulnerability by sending a specially crafted request to the target server, leveraging the security flaw to execute malicious code.

Mitigation and Prevention

This section outlines steps to mitigate the risks associated with CVE-2021-28474.

Immediate Steps to Take

Apply the latest security updates provided by Microsoft to address the vulnerability effectively.
Monitor network traffic for any suspicious activity that might indicate exploitation attempts.

Long-Term Security Practices

Regularly update and patch Microsoft SharePoint Server installations to protect against known vulnerabilities.
Implement network segmentation and access controls to limit the attack surface.

Patching and Updates

Stay informed about security advisories from Microsoft and promptly apply patches to ensure the security of your Microsoft SharePoint Server deployments.