rspec/rules/S6096/rationale.adoc

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Zip slip is a special case of path injection. It occurs when an application uses the name of an archive entry to construct a file path and access this file without validating its path first.
This rule will consider all archives untrusted, assuming they have been created outside the application file system.
A user with malicious intent would inject specially crafted values, such as ``++../++``, in the archive entry name to change the initial intended path. The resulting path would resolve somewhere in the filesystem where the user should not normally have access.