CVE-2021-45966 Explained : Impact and Mitigation

An issue was discovered in Pascom Cloud Phone System before 7.20.x, allowing remote attackers to execute arbitrary code via shell metacharacters.

Understanding CVE-2021-45966

What is CVE-2021-45966?

CVE-2021-45966 is a vulnerability found in Pascom Cloud Phone System before version 7.20.x. Attackers can exploit this issue through the management REST API, specifically the /services/apply endpoint in exd.pl, to execute malicious code using shell metacharacters.

The Impact of CVE-2021-45966

This vulnerability could result in remote code execution, enabling threat actors to compromise the affected system, steal sensitive information, or disrupt services.

Technical Details of CVE-2021-45966

Vulnerability Description

An issue in Pascom Cloud Phone System allows remote attackers to run arbitrary code via shell metacharacters within the management REST API.

Affected Systems and Versions

Product: Pascom Cloud Phone System
Versions: Before 7.20.x

Exploitation Mechanism

The vulnerability can be exploited by sending crafted requests to the /services/apply endpoint in exd.pl, leading to the execution of unauthorized commands.

Mitigation and Prevention

Immediate Steps to Take

Update the Pascom Cloud Phone System to version 7.20.x or later
Restrict network access to critical systems
Monitor and analyze network traffic for any suspicious activity

Long-Term Security Practices

Implement strong authentication mechanisms
Regularly review and update security policies
Conduct security training and awareness programs for employees

Patching and Updates

Apply security patches provided by Pascom to address the vulnerability