External vs. Internal Penetration Test
External Penetration Test
An external penetration test simulates an attack originating from the internet without any prior access to internal systems. The assessment focuses exclusively on publicly exposed components such as web applications, services, and network interfaces. The objective is to identify vulnerabilities in the external attack surface and evaluate the effectiveness of security controls such as firewalls, gateways, and access restrictions. Typical findings include misconfigurations, exposed services, and insecure web applications.
Internal Penetration Test
An internal penetration test assumes an attacker with an already compromised foothold (e.g., user account or physical access). The focus lies on analyzing internal networks, systems, and permission structures. The goal is to uncover opportunities for lateral movement and privilege escalation. Common weaknesses include insufficient network segmentation, weak authentication mechanisms, and inadequate access controls.
Summary
External and internal penetration tests address different attack scenarios and complement each other. While external tests assess the exposed attack surface, internal tests evaluate the potential impact of a successful initial compromise. For a realistic security assessment, both approaches should be combined.
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