External Pentesting: Purpose and Importance

What is it Testing?

By definition, external tests are conducted from a black-box or unauthenticated approach. Depending on the type of asset, the team will assess first if the asset is reachable, then perform reconnaissance to find out what type of services are available and what technologies are being used on those services. Then, a set of custom attacks are performed over all of the in-scope assets to meet the specific goals of the test, which could range from gaining access to a private network to checking if defense controls are well-implemented.

Why is it important?

The external environment of an organization is composed of everything that is exposed to the public internet, which is often where hackers start because these attacks don’t require any privileged information. Having a good external security posture is a basic requirement to decrease the probability of a cybersecurity event like a data breach.

Framework/Methodology

✅ Penetration Testing Execution Standard (PTES)

✅ OWASP Top 10 (for web services)

✅ Enumeration, Fingerprinting, and Exploitation (non-web services)

✅ Compliance frameworks as needed by client (PCI, SOC 2, HIPAA, etc)

Examples of attacks/findings

✅ Firewall Evasion

✅ Leaked Credentials

✅ Active Default Credentials

✅ Exposure of Sensitive Data