Path traversal
An application is said to be vulnerable to path traversal attack when the user is able to navigate out of the web root folder. Users should only be restricted to the web root directory and should not be able to access anything above the web root. A malicious user will look out for direct links to files out of the web root, the most attractive being the operating system root directory. By altering the variable that references a file with different variations, it may be possible to access files stored on the server and exploit the path traversal flaw.
The most basic path traversal attack is using the ../ sequence to modify the resource request through the URL. The expression ../ is used in operating systems to move up one directory. ...
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