CVE-2020-16873 : Security Advisory and Response

Microsoft Xamarin.Forms is susceptible to a spoofing vulnerability due to default settings on Android WebView versions prior to 83.0.4103.106. This could enable an attacker to execute arbitrary Javascript code on a target system by luring a user to a malicious website or one serving the malicious code through Xamarin.Forms. The security update mitigates this risk by preventing the execution of malicious Javascript in the WebView.

Understanding CVE-2020-16873

This section provides insights into the nature and impact of the CVE-2020-16873 vulnerability.

What is CVE-2020-16873?

CVE-2020-16873 is a spoofing vulnerability in Microsoft Xamarin.Forms that allows attackers to run arbitrary Javascript code on a target system through malicious websites or code served via Xamarin.Forms.

The Impact of CVE-2020-16873

The vulnerability poses a medium severity risk with a CVSS base score of 4.7. Attackers could exploit this flaw to execute unauthorized Javascript code on affected systems.

Technical Details of CVE-2020-16873

Explore the technical aspects of the CVE-2020-16873 vulnerability.

Vulnerability Description

The vulnerability arises from default settings in pre-83.0.4103.106 versions of Android WebView, enabling the execution of arbitrary Javascript code.

Affected Systems and Versions

Vendor: Microsoft
Product: Xamarin.Forms
Affected Version: 83.0.0 (custom version)
Platforms: Unknown

Exploitation Mechanism

Attackers can exploit this vulnerability by tricking users into visiting malicious websites or websites serving malicious code through Xamarin.Forms.

Mitigation and Prevention

Learn how to address and prevent the CVE-2020-16873 vulnerability.

Immediate Steps to Take

Apply the security update provided by Microsoft to prevent the execution of malicious Javascript.
Educate users about the risks of visiting unknown or untrusted websites.

Long-Term Security Practices

Regularly update software and applications to patch known vulnerabilities.
Implement web filtering and security measures to block access to malicious websites.

Patching and Updates

Ensure timely installation of security patches and updates to protect systems from known vulnerabilities.