CVE-2020-21054 : Exploit Details and Defense Strategies

A Cross Site Scripting (XSS) vulnerability in FusionPBX 4.5.7 allows remote attackers to inject malicious scripts or HTML code.

Understanding CVE-2020-21054

This CVE involves a security issue in FusionPBX version 4.5.7 that enables attackers to execute XSS attacks.

What is CVE-2020-21054?

This CVE identifies a vulnerability in FusionPBX 4.5.7 that permits remote malicious users to inject arbitrary web script or HTML through an unsanitized 'f' variable in app\vars\vars_textarea.php.

The Impact of CVE-2020-21054

The vulnerability can be exploited by remote attackers to execute malicious scripts or inject harmful content into web pages, potentially leading to various security risks.

Technical Details of CVE-2020-21054

This section provides more in-depth technical insights into the vulnerability.

Vulnerability Description

The XSS vulnerability in FusionPBX 4.5.7 allows attackers to insert unauthorized scripts or HTML code via the unsanitized 'f' variable in app\vars\vars_textarea.php.

Affected Systems and Versions

Affected Version: FusionPBX 4.5.7
Other versions may also be impacted if they contain the same unsanitized 'f' variable.

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting malicious scripts or HTML code through the vulnerable 'f' variable, potentially compromising the security and integrity of the system.

Mitigation and Prevention

To address CVE-2020-21054 and enhance overall security, consider the following mitigation strategies:

Immediate Steps to Take

Update FusionPBX to the latest patched version.
Implement input validation mechanisms to sanitize user inputs and prevent XSS attacks.

Long-Term Security Practices

Regularly monitor and audit web applications for vulnerabilities.
Educate developers and users about secure coding practices to prevent XSS vulnerabilities.

Patching and Updates

Apply security patches promptly to address known vulnerabilities and enhance system security.