Healthcare Provider Network Security Review
Comprehensive internal network and infrastructure security assessment for a UK healthcare provider handling sensitive patient data
The Challenge
A UK healthcare provider network needed to assess the security of their internal infrastructure and patient management systems. The organisation handles sensitive patient data and required compliance with UK GDPR, Data Protection Act 2018, and NHS Digital standards.
The healthcare provider operates multiple clinics with interconnected systems including electronic patient records, medical device networks, and web-based patient portals. With increasing cyber threats targeting healthcare organisations and strict regulatory requirements, they needed assurance that patient data was adequately protected.
Our Approach
We conducted a comprehensive security assessment covering all critical aspects of their IT infrastructure:
Internal Network Penetration Testing
Comprehensive assessment of internal network security from both authenticated and unauthenticated perspectives. We tested network segmentation, lateral movement opportunities, and internal service security across all clinic locations.
Active Directory Security Assessment
Detailed review of Active Directory configuration, group policies, privileged accounts, and authentication mechanisms. We tested for common AD attack paths including Kerberoasting, privilege escalation, and domain compromise vectors.
Medical Device Network Segmentation
Assessment of network segmentation controls separating medical devices from corporate networks. We reviewed firewall rules, VLAN configurations, and access controls to ensure proper isolation of critical medical equipment.
Patient Portal Web Application Testing
Security testing of patient-facing web applications including appointment booking systems and electronic health record portals. We tested authentication, authorization, data handling, and compliance with healthcare security standards.
Key Findings
- Critical Network Segmentation Issues: Medical device networks were not properly isolated from corporate networks, allowing potential lateral movement from compromised workstations to critical medical equipment
- Privilege Escalation Paths to Domain Admin: Discovered multiple paths to escalate from standard user accounts to domain administrator privileges through misconfigured service accounts and excessive permissions
- Unencrypted Patient Data in Transit: Found several internal systems transmitting patient identifiable information without encryption between clinic locations
- Weak Authentication on Legacy Systems: Identified legacy patient management systems using default credentials and weak password policies
- Inadequate Logging and Monitoring: Insufficient security logging made it difficult to detect or investigate potential security incidents
- GDPR Compliance Gaps: Several data protection issues that could result in regulatory penalties
Remediation & Retest
We provided detailed, actionable remediation guidance aligned with NHS Digital standards and UK data protection regulations:
- Network segmentation design to properly isolate medical devices
- Active Directory hardening recommendations with tiered administration model
- Encryption requirements for all patient data in transit and at rest
- Multi-factor authentication implementation for administrative access
- Security logging and monitoring strategy for incident detection
- GDPR-aligned data protection controls and procedures
Following remediation, we conducted a comprehensive retest validating that all critical and high-risk vulnerabilities were successfully addressed and security controls were functioning effectively.
Impact & Outcome
The healthcare provider successfully addressed all critical vulnerabilities, preventing potential data protection breaches affecting over 100,000 patient records. The improved security posture ensured compliance with NHS Digital standards, UK GDPR, and Data Protection Act 2018, avoiding potential regulatory penalties and reputational damage.