CVE-2021-37524 : Exploit Details and Defense Strategies

A Cross Site Scripting (XSS) vulnerability in FusionPBX 4.5.26 allows remote unauthenticated users to inject arbitrary web script or HTML via an unsanitized 'path' parameter in resources/login.php.

Understanding CVE-2021-37524

This CVE identifies a critical Cross Site Scripting (XSS) vulnerability in FusionPBX 4.5.26 that can be exploited by remote unauthenticated attackers.

What is CVE-2021-37524?

The CVE-2021-37524 vulnerability in FusionPBX 4.5.26 enables attackers to inject malicious web script or HTML via an unsanitized 'path' parameter in the 'resources/login.php' file.

The Impact of CVE-2021-37524

This vulnerability allows remote unauthenticated attackers to execute arbitrary scripts on the target system, potentially leading to sensitive data theft, account hijacking, and other malicious activities.

Technical Details of CVE-2021-37524

The following are the technical details of the CVE-2021-37524 vulnerability:

Vulnerability Description

The vulnerability arises from insufficient input validation in the 'path' parameter of the 'resources/login.php' file, allowing attackers to inject malicious scripts.

Affected Systems and Versions

FusionPBX version 4.5.26 is affected by this vulnerability, putting instances of this version at risk of exploitation.

Exploitation Mechanism

Remote unauthenticated attackers can exploit this vulnerability by injecting crafted web script or HTML code into the 'path' parameter, leading to the execution of malicious scripts.

Mitigation and Prevention

To safeguard systems from CVE-2021-37524, the following steps are recommended:

Immediate Steps to Take

Upgrade FusionPBX to a patched version that addresses the XSS vulnerability.
Implement input sanitization mechanisms to filter out potentially malicious script injections.

Long-Term Security Practices

Regularly monitor security advisories and update FusionPBX to the latest versions.
Educate users about the risks of XSS attacks and the importance of safe browsing practices.

Patching and Updates

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