CVE-2021-23443 : Security Advisory and Response

This CVE-2021-23443 article provides detailed information about a Cross-site Scripting (XSS) vulnerability affecting the edge.js package before version 5.3.2.

Understanding CVE-2021-23443

In this section, we will explore what CVE-2021-23443 entails and its implications.

What is CVE-2021-23443?

CVE-2021-23443 refers to a type confusion vulnerability in the edge.js package that allows bypassing input sanitization when rendering an array instead of a string or SafeValue, even with the use of {{ }}.

The Impact of CVE-2021-23443

The impact of this vulnerability includes a medium severity level with a CVSS base score of 5.4. It can lead to Cross-site Scripting (XSS) attacks, compromising the confidentiality and integrity of affected systems.

Technical Details of CVE-2021-23443

This section delves into the technical aspects of the CVE-2021-23443 vulnerability.

Vulnerability Description

The vulnerability arises in edge.js versions prior to 5.3.2 due to a type confusion issue that enables attackers to evade input sanitization when handling array inputs improperly.

Affected Systems and Versions

The vulnerability impacts edge.js versions below 5.3.2, allowing threat actors to exploit this issue in affected systems.

Exploitation Mechanism

Exploiting CVE-2021-23443 involves manipulating the input handling to render arrays instead of strings or SafeValues, bypassing security checks like {{ }}.

Mitigation and Prevention

In this section, we will discuss mitigation strategies and preventive measures against CVE-2021-23443.

Immediate Steps to Take

Users are advised to update their edge.js package to version 5.3.2 or higher to mitigate the vulnerability. Additionally, input sanitization practices should be reinforced.

Long-Term Security Practices

Implementing secure coding practices and conducting regular security audits can help prevent similar vulnerabilities in the future.

Patching and Updates

Regularly monitor for security patches and updates for edge.js to stay protected against known vulnerabilities.