Directory Traversal

Definitions

Directory Traversal is an attack technique in which an adversary uses crafted path input to access files or directories outside the intended application scope. Defenders analyze it to understand prerequisites, affected trust boundaries, and likely telemetry, then reduce risk with layered controls such as validation, hardening, rate limits, segmentation, and high-quality logging for investigation and response.
In plain English: Directory Traversal is a way attackers abuse systems or trust relationships, and defenders counter it with better design, validation, monitoring, and layered controls.
Example: "During the assessment, the team simulated Directory Traversal against a staging service, confirmed the weakness with logs and telemetry, and then added tighter validation, safer defaults, and monitoring so the same technique would trigger an alert in production."