Description

Common Internet File System (CIFS) is a network file-sharing protocol that allows systems to share files over a network. However, unrestricted CIFS access can expose your data to unauthorized users, leading to potential security risks. It is important to restrict CIFS access to only trusted networks and users to prevent unauthorized access and data breaches.

Rationale

Allowing unrestricted CIFS access can lead to significant security vulnerabilities, as it may allow unauthorized users to access sensitive files and data. By restricting CIFS access to known and trusted networks, you can minimize the risk of unauthorized access and protect sensitive data from exposure to potential attackers. Implementing proper network access controls and permissions is essential for maintaining the security and integrity of your file-sharing systems.

Impact

Restricting CIFS access may require additional configuration and management effort. However, the benefits of enhanced security and reduced risk of unauthorized access to sensitive data far outweigh the potential challenges.

Audit

This policy marks an EC2 Security Group as INCOMPLIANT if it contains a rule that meets all the following conditions:

• The Direction is set to Inbound.
• The Source IP Range is 0.0.0.0/0 or ::/0.
• The Protocol is All, tcp, or udp.
• The From Port and To Port fields include port 445.

The EC2 Security Group that does not contain a rule meeting all these conditions is considered COMPLIANT.