CVE-2017-16153: Directory Traversal in gaoxuyan

The vulnerability stems from improper path sanitization when processing user-supplied URLs. While the exact implementation details aren't visible, the nature of directory traversal vulnerabilities in Node.js typically involves: 1) A file-serving endpoint that takes URL paths directly 2) Use of raw path concatenation (e.g., __dirname + req.url) 3) Lack of normalization checks using path.resolve() or equivalent. The high confidence comes from the documented attack pattern (../../ sequences in URLs) and the CWE-22 classification, which directly maps to this type of unsanitized path handling.