Preventing Path Traversal Vulnerabilities in Java Applications

Path traversal is a security vulnerability that allows attackers to access unauthorized files and directories by manipulating file paths. In Java applications, this issue arises when user input is used to construct file paths without proper validation, potentially exposing sensitive files such as system configurations and application secrets.

To mitigate path traversal risks, developers should normalize file paths using getCanonicalPath() and ensure they reside within an intended directory. Validating user input by rejecting suspicious patterns like ../ and enforcing strict filename constraints can further reduce risks. Additionally, using secure APIs that abstract file operations helps prevent unintended access. Implementing these best practices ensures Java applications remain protected against path traversal attacks. 

https://systemweakness.com/path-traversal-and-remediation-in-java-28a1edb45853

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