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So the payload becomes:
Consider a PHP application with the following vulnerable backend implementation: -include-..-2F..-2F..-2F..-2Froot-2F
Here is an analysis of how this payload works, the risks it presents, and how developers can protect their applications. Anatomy of the Payload
: Repeating the sequence forces the application to climb multiple levels upward through the operating system's directory structure. Even if the application is nested deeply, sufficient repetitions will eventually hit the root directory, as systems stop ascending once the absolute root is reached. Anatomy of the Payload : Repeating the sequence
: Ensure all user input, especially parameters used in file I/O operations, are properly validated and sanitized.
: Remove or encode characters like .. , / , and \ before using them in file system APIs. : Remove or encode characters like
: In some scenarios, an attacker can combine this with file upload vulnerabilities to execute arbitrary commands on the server.
