CVE-2021-30461 Explained : Impact and Mitigation

A remote code execution vulnerability was found in the web UI of VoIPmonitor before version 24.61, allowing an attacker to inject PHP code via the user-supplied SPOOLDIR value in the config/configuration.php file.

Understanding CVE-2021-30461

This section provides details on the impact and technical aspects of the CVE-2021-30461 vulnerability.

What is CVE-2021-30461?

The CVE-2021-30461 vulnerability is a remote code execution issue in VoIPmonitor's web UI, enabling malicious actors to execute arbitrary PHP code by manipulating the SPOOLDIR value.

The Impact of CVE-2021-30461

The exploitation of this vulnerability could lead to unauthorized access, data theft, or further attacks on the affected system.

Technical Details of CVE-2021-30461

Let's delve into the specifics of the vulnerability to understand its implications and how it can be mitigated.

Vulnerability Description

The flaw resides in the web UI of VoIPmonitor, where untrusted user input is not sanitized before being written to the configuration file, opening the door for code injection attacks.

Affected Systems and Versions

VoIPmonitor versions prior to 24.61 are impacted by this vulnerability, exposing systems that have not been updated to the latest release.

Exploitation Mechanism

By manipulating the SPOOLDIR value during the recheck process, attackers can insert malicious PHP code into the configuration file, leading to arbitrary code execution.

Mitigation and Prevention

To safeguard systems from CVE-2021-30461, immediate actions and long-term security measures are crucial.

Immediate Steps to Take

Update VoIPmonitor to version 24.61 or above to mitigate the vulnerability.
Monitor for any unusual activities on the system that might indicate exploitation of the flaw.

Long-Term Security Practices

Implement input validation mechanisms to sanitize user-supplied data and prevent code injection attacks.
Regularly audit and update security configurations to protect against evolving threats.

Patching and Updates

Stay informed about security advisories and apply patches promptly to address known vulnerabilities in VoIPmonitor.