How penetration testing works
A penetration test follows an agreed scope and rules of engagement. Testers gather information, scan for weaknesses, then attempt to exploit them manually and with tools, chaining issues together to see how far access extends, for example from a web flaw to internal data.
Tests can be black box, grey box or white box depending on how much information testers receive, and target networks, web applications, cloud, wireless or people. The result is a report with evidence, risk ratings and remediation guidance, usually followed by retesting.
Why it matters for Canadian organizations
Penetration testing provides evidence that controls work in practice, which is valuable to boards, customers and insurers. Many frameworks and contracts, including PCI-DSS, expect regular testing, and OSFI B-13 sets expectations for technology risk testing at federally regulated institutions.
It also supports privacy obligations. PIPEDA and Law 25 require safeguards appropriate to the sensitivity of personal information, and test results help demonstrate that organizations actively look for and fix weaknesses. Choose testers who communicate clearly, because findings must be understood by developers and executives alike.
How to implement it
Define goals, scope and timing, and choose a qualified provider with relevant certifications and clear rules of engagement. Notify operations staff and confirm legal authorization, especially for third-party hosted systems and production environments.
After the test, assign owners to each finding, fix critical items first, and retest to confirm. Repeat at least annually and after major changes, and combine with continuous vulnerability scanning between tests. Scope should reflect real risk, such as internet-facing applications, remote access and systems holding personal information.
Frequently asked questions
What is the difference between a penetration test and a vulnerability scan?
A vulnerability scan automatically lists known weaknesses. A penetration test adds human testers who attempt to exploit them, chain issues together and judge real business impact. The scan finds; the test proves. It delivers a verified, risk-rated view of what an attacker could achieve.
How often should penetration testing be done?
At least annually, and after significant changes such as new applications, infrastructure or mergers. Some standards and contracts, such as PCI-DSS, specify minimum frequency. Results from tests are more actionable because exploitability is demonstrated. Run it after any significant change, too.
How much does a penetration test cost?
Cost depends on scope, size, complexity and depth of testing, so providers quote after scoping. A small web application test costs far less than a full internal network and cloud assessment. Retests confirm that fixes work.
Related service: Penetration testing