CVE-2021-43405 : What You Need to Know

FusionPBX before 4.5.30 allows risky characters in fax_extension, potentially leading to security vulnerabilities.

Understanding CVE-2021-43405

An overview of the security issue in FusionPBX before version 4.5.30.

What is CVE-2021-43405?

FusionPBX version prior to 4.5.30 is susceptible to security risks due to unrestricted characters in the fax_extension field.

The Impact of CVE-2021-43405

The presence of unsafe characters in the fax_extension field could expose systems to possible security breaches and unauthorized access.

Technical Details of CVE-2021-43405

Insight into the specific technical aspects of the CVE.

Vulnerability Description

The issue in FusionPBX allows for risky characters in the fax_extension field, which should be constrained to numeric values only.

Affected Systems and Versions

Affected version: FusionPBX before 4.5.30

Exploitation Mechanism

Hackers may exploit this vulnerability by injecting malicious content into the fax_extension field to compromise the system.

Mitigation and Prevention

Strategies to address and mitigate the CVE-2021-43405 vulnerability.

Immediate Steps to Take

Upgrade FusionPBX to version 4.5.30 or newer to eliminate the security risk.
Regularly monitor and review fax_extension inputs for any suspicious characters.

Long-Term Security Practices

Implement input validation mechanisms to restrict user input to permissible characters.
Conduct routine security audits to identify and rectify any similar vulnerabilities.

Patching and Updates

Apply security patches promptly and consistently to safeguard against known vulnerabilities.