CVE-2021-43695 : What You Need to Know

IssabelPBX version 2.11 is affected by a Cross Site Scripting (XSS) vulnerability in page.backup_restore.php, potentially leading to XSS attacks.

Understanding CVE-2021-43695

What is CVE-2021-43695?

CVE-2021-43695 is a security vulnerability in IssabelPBX version 2.11 that allows attackers to execute malicious scripts in the context of a web application.

The Impact of CVE-2021-43695

The vulnerability can lead to Cross Site Scripting (XSS) attacks, enabling attackers to inject and execute malicious scripts on the user's web browser.

Technical Details of CVE-2021-43695

Vulnerability Description

The issue lies in the exit function in page.backup_restore.php, where unsanitized user inputs ($_REQUEST) are included in error messages, facilitating XSS exploitation.

Affected Systems and Versions

Product: IssabelPBX
Version: 2.11

Exploitation Mechanism

Attackers can exploit the XSS vulnerability by injecting malicious scripts through unsanitized user inputs, leading to unauthorized script execution.

Mitigation and Prevention

Immediate Steps to Take

Apply the vendor-released patch for IssabelPBX version 2.11 to address the XSS vulnerability.
Regularly sanitize and validate user inputs to prevent XSS attacks.

Long-Term Security Practices

Conduct regular security audits to identify and address vulnerabilities in the system.
Educate developers on secure coding practices to prevent XSS vulnerabilities.

Patching and Updates

Stay updated with security alerts and apply patches promptly to mitigate known vulnerabilities in the system.