CVE-2021-37573 : Security Advisory and Response

A reflected cross-site scripting (XSS) vulnerability in the web server TTiny Java Web Server and Servlet Container (TJWS) <=1.115 allows an adversary to inject malicious code on the server's "404 Page not Found" error page.

Understanding CVE-2021-37573

This section provides an insight into the CVE-2021-37573 vulnerability.

What is CVE-2021-37573?

CVE-2021-37573 is a reflected cross-site scripting (XSS) vulnerability found in the TTiny Java Web Server and Servlet Container (TJWS) version <=1.115, allowing attackers to inject malicious code onto the server's error page.

The Impact of CVE-2021-37573

The vulnerability could be exploited by malicious actors to execute harmful scripts, leading to unauthorized access, data theft, and potential compromise of the affected web server.

Technical Details of CVE-2021-37573

This section delves into the technical aspects of CVE-2021-37573.

Vulnerability Description

The XSS flaw in TJWS <=1.115 enables attackers to insert and execute malicious scripts on the server's error page, potentially impacting the server's integrity and security.

Affected Systems and Versions

The vulnerability affects TJWS versions <=1.115, putting servers using these versions at risk of XSS attacks.

Exploitation Mechanism

By injecting specially crafted scripts into the "404 Page not Found" error page of the web server, threat actors can execute malicious code on the server.

Mitigation and Prevention

This section outlines the measures to mitigate and prevent CVE-2021-37573.

Immediate Steps to Take

Update TJWS to a patched version that addresses the XSS vulnerability.
Implement input validation mechanisms to sanitize user inputs and prevent script injection.

Long-Term Security Practices

Regularly update and patch web servers and applications to protect against known vulnerabilities.
Conduct security assessments and audits to identify and address XSS and other security weaknesses.

Patching and Updates

Stay informed about security advisories and patches released by TJWS to promptly apply necessary security updates and protect your web server from potential exploits.