CVE-2020-8823 : Security Advisory and Response

HTMLfile in lib/transport/htmlfile.js in SockJS before 0.3.0 is vulnerable to Reflected XSS via the /htmlfile c (aka callback) parameter.

Understanding CVE-2020-8823

HTMLfile in lib/transport/htmlfile.js in SockJS before 0.3.0 is susceptible to a Reflected Cross-Site Scripting (XSS) attack through the /htmlfile c parameter.

What is CVE-2020-8823?

CVE-2020-8823 is a vulnerability found in SockJS before version 0.3.0 that allows for Reflected XSS via the /htmlfile c parameter. This vulnerability could be exploited by an attacker to execute malicious scripts in the context of a user's browser.

The Impact of CVE-2020-8823

The impact of this vulnerability includes the potential for attackers to execute arbitrary scripts within the user's browser, leading to various malicious activities such as data theft, session hijacking, and unauthorized actions on behalf of the user.

Technical Details of CVE-2020-8823

HTMLfile in lib/transport/htmlfile.js in SockJS before 0.3.0 is vulnerable to Reflected XSS via the /htmlfile c (aka callback) parameter.

Vulnerability Description

The vulnerability arises from inadequate input validation in the /htmlfile c parameter, allowing attackers to inject and execute malicious scripts in the user's browser.

Affected Systems and Versions

SockJS versions before 0.3.0 are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting a malicious link containing the /htmlfile c parameter with a script payload, tricking users into clicking the link and executing the script in their browser.

Mitigation and Prevention

It is crucial to take immediate steps to mitigate the risks posed by CVE-2020-8823.

Immediate Steps to Take

Update SockJS to version 0.3.0 or newer to patch the vulnerability.
Implement input validation and sanitization mechanisms to prevent XSS attacks.

Long-Term Security Practices

Regularly monitor and update software components to address security vulnerabilities promptly.
Educate users and developers on secure coding practices to prevent XSS vulnerabilities.

Patching and Updates

Stay informed about security advisories and updates from SockJS to apply patches promptly and ensure the security of your systems.