Preventing Backtracking Attacks

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Q: As a senior developer, Rudy is cognizant of security threats and develops web application code that recognizes when a malicious user has made a URI request for a file or directory. Upon such a request, her code will actually build a full path to the file/directory (as long as it exists) and normalize every character (for example, %20 will be converted to spaces). Which of the below is she attempting to prevent?


a. Security misconfiguration

b. Cross site scripting

c. SQL injection

d. Directory traversal attacks

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