Overview
Local File Inclusion Filter Bypass focuses on an application that tries to protect file loading with incomplete path filtering.
This lab shows why blocking a few traversal patterns is fragile. If the application still maps user-controlled input to local files, bypasses can remain possible unless the accessible file set is strictly controlled.
Security Impact
Bypassing a file inclusion filter can expose sensitive local files such as configuration, logs, source code, or system metadata. These disclosures can help attackers understand the application and plan further attacks.
Vulnerability Scope
This issue appears in applications that patch LFI with string replacement, blacklist checks, extension assumptions, or partial normalization while keeping unsafe file selection behavior.
Lab Focus
The lab focuses on filter-based LFI defenses, why denylist checks are unreliable, and how allowlisted file identifiers reduce file inclusion risk.
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