CVE-2020-1453 : Security Advisory and Response

Microsoft SharePoint Remote Code Execution Vulnerability was published on September 11, 2020. It affects various versions of Microsoft SharePoint servers, allowing remote attackers to execute arbitrary code. The CVSS score for this vulnerability is 8.6 (High).

Understanding CVE-2020-1453

A remote code execution flaw in Microsoft SharePoint enables attackers to run malicious code on the server, potentially leading to severe consequences.

What is CVE-2020-1453?

The vulnerability arises from SharePoint failing to validate the source markup of application packages, allowing attackers to execute arbitrary code.
Successful exploitation grants attackers the ability to run code within the context of SharePoint's application pool and server farm account.
It necessitates a user to upload a specially crafted SharePoint application package to an impacted SharePoint version.

The Impact of CVE-2020-1453

Type of Vulnerability: Remote Code Execution
Attack Vector: Network
Scope: Unchanged
Confidentiality: Low
Integrity: High
Availability: Low
Complexity: Low
Authentication: None
Risk: Critical

Technical Details of CVE-2020-1453

This section outlines the technical specifics of the vulnerability.

Vulnerability Description

The flaw allows remote code execution within SharePoint by evading source markup validation in application packages.

Affected Systems and Versions

Microsoft SharePoint Enterprise Server 2016 (Version 16.0.0)
Microsoft SharePoint Enterprise Server 2013 Service Pack 1 (Version 15.0.0)
Microsoft SharePoint Server 2019 (Version 16.0.0)
Microsoft SharePoint Foundation 2010 Service Pack 2 (Version 13.0.0)
Microsoft SharePoint Foundation 2013 Service Pack 1 (Version 15.0.0)
Platforms: x64-based Systems (Unless specified as 'Unknown')

Exploitation Mechanism

Attackers exploit the vulnerability by uploading a specially crafted SharePoint application package to the target SharePoint environment.

Mitigation and Prevention

Protect your systems from CVE-2020-1453 with these security measures.

Immediate Steps to Take

Apply the latest security update provided by Microsoft to remediate the vulnerability.
Disable external sharing if not required to minimize attack surface.
Monitor system logs and user activities for any suspicious behavior.

Long-Term Security Practices

Conduct regular security assessments and audits to identify and mitigate vulnerabilities proactively.
Implement the principle of least privilege to restrict user access and permissions.
Educate users on safe computing practices and the importance of vigilant security awareness.

Patching and Updates

Regularly update and patch all software and applications, especially security-critical components like Microsoft SharePoint.