Intranet Blindspots: Securing SMB Network Shares and NAS Storage

Introduction

Many small and medium-sized businesses (SMBs) rely on local Network-Attached Storage (NAS) or SMB network shares to share documents among team members. While convenient, these local files represent a major blindspot in security.

The Risks of Local Shared Drives

Since local network drives exist inside the office firewall, firms often assume they are secure. However, they face several risks:

• **Broad Access Control**: Permissions on NAS shares are often set loosely, allowing interns or guest users to access directories containing client records.
• **Ransomware Targets**: If a single workstation on the network is infected, ransomware can quickly spread to and encrypt the entire shared network drive.
• **Credential Storage**: Developers or IT technicians often leave config files or backups containing plaintext passwords on shared servers.

Securing Your SMB Storage

To secure local network shares and NAS systems, firms should:

1. **Enforce Least Privilege**: Restrict read/write permissions to specific folders based on job roles.

2. **Scan for Unencrypted Passwords**: Run automated audits on shared drives to locate configuration files containing database credentials or API keys.

3. **Regular Monitoring**: Set up scheduled scans to ensure new files uploaded to shared drives are checked for PII.

By auditing internal storage, SMBs can protect their client records and prevent leaks from compromising their networks.