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Path Equivalence: 'fakedir/../realdir/filename'

Path Equivalence: 'fakedir/../realdir/filename'

CWE-57

Short description

The product contains protection mechanisms to restrict access to 'realdir/filename', but it constructs pathnames using external input in the form of 'fakedir/../realdir/filename' that are not handled by those mechanisms. This allows attackers to perform unauthorized actions against the targeted file.

Best practices to prevent this CWE

Phase: Implementation

Strategy: Input Validation

Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked.

Prioritize and Uncover Reachable Vulnerabilities in Your Application Code

Identify externally reachable data flows and vulnerabilities for effective risk mitigation

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