How do I manage third party access to my network

Brian’s Reno auto repair shop nearly lost everything last November. A disgruntled former HVAC technician, accessing the network remotely through a forgotten VPN account, didn’t just tamper with the temperature controls—he triggered a ransomware attack that locked down their entire system, including the diagnostic computers essential for repairs. The recovery cost Brian $35,000 in ransom, lost revenue during downtime, and a significant hit to his reputation. This isn’t a Hollywood plot; it’s a common scenario I’ve seen play out too many times in my 16+ years helping businesses in the Reno area secure their IT infrastructure. It’s about more than just “IT services”; it’s about protecting your livelihood.

Why is Third-Party Access a Cybersecurity Risk?

You might be thinking, “Why do I even need to give vendors access to my network?” It’s true, limiting access is ideal. However, modern businesses rely on partnerships. HVAC, security systems, managed print services, specialized software support – these all often require some level of network access for monitoring, maintenance, or troubleshooting. The problem isn’t the access itself, it’s unmanaged access. Each third-party connection creates a potential vulnerability, expanding your attack surface and complicating incident response. If their security is lax, you’re inheriting their risk.

What Types of Third-Party Access Are Common?

• Remote Access (VPN, RDP): This is the most common, allowing vendors to connect directly to your network as if they were on-site.
• Cloud Application Access: Granting access to specific software applications hosted in the cloud, like CRM or accounting systems.
• Managed Service Integrations: Automated connections for services like network monitoring, backup solutions, or security tools.
• IoT Devices: Increasingly, devices like security cameras, smart thermostats, and building automation systems connect directly to your network.

How Can I Secure Third-Party Access?

The key is to treat third-party access with the same rigor you apply to your own internal users. Here’s a step-by-step approach:

• Strong Vendor Risk Assessment: Before granting any access, thoroughly vet your vendors’ security practices. Ask for documentation of their security policies, certifications (like SOC 2), and incident response plan.
• Least Privilege Access: This is paramount. Grant only the minimum level of access required for the vendor to perform their specific tasks. Don’t give them broad network access when a limited, role-based connection will suffice.
• Multi-Factor Authentication (MFA): Require MFA for all third-party access. This adds an extra layer of security, even if a password is compromised.
• Network Segmentation: Isolate vendor access to specific network segments. This limits the damage if their account is compromised, preventing them from accessing critical systems.
• Just-in-Time (JIT) Access: Instead of granting persistent access, provide temporary access only when it’s needed. Utilize Privileged Access Management (PAM) tools to automate this process.

What About Documentation and Auditing?

• Maintain a Detailed Access Inventory: Keep a record of every vendor with access to your network, the level of access granted, and the purpose of that access.
• Regular Access Reviews: Periodically review the access inventory to ensure it’s still accurate and necessary. Revoke access immediately when it’s no longer needed.
• Monitoring and Logging: Implement robust logging and monitoring to track all third-party activity. Look for suspicious behavior and investigate any anomalies.

What Legal Considerations Should I Be Aware Of?

Nevada Revised Statutes (NRS) 603A.215 requires businesses to maintain “reasonable security measures” to protect personal information. This applies not only to your own internal security practices, but also to the security of your third-party vendors. Failing to adequately manage vendor access could expose you to legal liability in the event of a data breach (NRS 603A.010 et seq.). Furthermore, if you collect customer data as part of your business operations, Nevada SB 220 (NRS 603A.340) requires you to provide consumers with the right to opt-out of the sale of their personal information, which necessitates careful management of vendor access to that data. Automatic renewal provisions in managed IT service contracts (NRS 598.950) should also be clearly outlined, impacting any recurring vendor agreements.

To expand your knowledge on these critical IT subjects, check out these resources:

• Can Reno Cyber IT Solutions help with creating an IT budget?
• Can digital transformation help my business stand out in Reno?
• How do I monitor my cloud usage?

About Scott Morris and Reno Cyber IT Solutions LLC.

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