CVE-2021-43698 : Security Advisory and Response

phpWhois (last update Jun 30 2021) is affected by a Cross Site Scripting (XSS) vulnerability in file example.php, potentially allowing attackers to execute malicious scripts.

Understanding CVE-2021-43698

What is CVE-2021-43698?

phpWhois is susceptible to a Cross Site Scripting (XSS) vulnerability, triggered by the exit function in the example.php file.

The Impact of CVE-2021-43698

This vulnerability could permit attackers to inject and execute malicious scripts via the user message containing $_GET['query'].

Technical Details of CVE-2021-43698

Vulnerability Description

The XSS flaw in phpWhois occurs due to improper validation of user-supplied input in the exit function, leading to script termination and possible script execution.

Affected Systems and Versions

Affected: phpWhois (last update Jun 30 2021)
Version: Not specified

Exploitation Mechanism

Attackers can inject malicious scripts through the $_GET['query'] parameter, exploiting the lack of input sanitization in the exit function.

Mitigation and Prevention

Immediate Steps to Take

Apply the patch provided by the vendor or software developer to address the XSS vulnerability.
Implement input validation and sanitization procedures to filter out potentially harmful user input.

Long-Term Security Practices

Regularly update software and applications to the latest versions to mitigate known vulnerabilities.

Patching and Updates

Stay informed about security advisories and updates released by phpWhois to promptly apply patches to secure systems.