An attacker can hide a "path traversal" payload (like ../../tmp/malware ) that only the Extractor sees, effectively slipping it past the security check. Why It’s a Problem for Developers
A "schizophrenic" ZIP is an archive crafted to exploit ambiguities in how different programs parse data. For example, if you feed a file named Schizophrenia.zip to a security scanner, the scanner might only see a harmless file named notes.txt . However, when a user double-clicks to extract it, the decompression tool might instead find and run a malicious executable. The core of this vulnerability lies in parser discrepancy : File: Schizophrenia.zip ...
Never trust a pre-extraction check. You must validate the destination path of every file at the exact moment it is being written to the disk. An attacker can hide a "path traversal" payload (like
Many programs use a "Check then Act" flow. They list the files inside a ZIP to verify they are safe, and then they extract them. However, when a user double-clicks to extract it,
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