Course

In this challenge, we review a Java snippet where a file is extracted from a zip archive. The process involves creating a ZipFile object and iterating through its entries to extract each file into the /tmp directory. The main issue lies in the handling of file names within the zip entries, specifically the lack of validation for potential directory traversal attacks. This vulnerability allows an attacker to craft a zip file with malicious file names that can escape the designated extraction directory, potentially leading to unauthorized file creation and overwriting critical system files.

The code snippet provided demonstrates how zip entries are processed and extracted to a destination directory. However, the absence of validation for zipEntry.getName() allows for the inclusion of directory traversal sequences (e.g., "../"), which can redirect the extraction path outside the intended directory. This oversight can be exploited to manipulate the file system, posing a significant security risk. It is crucial to implement proper validation and sanitization of file paths to prevent such vulnerabilities.