: Modern WAFs are designed to detect and block common attack patterns, including URL-encoded traversal sequences like -2F..-2F . Conclusion
: Attackers can read sensitive configuration files, database credentials, and system passwords. -include-..-2F..-2F..-2F..-2Froot-2F
: Instead of building paths manually, use filesystem APIs that resolve paths and ensure they remain within a specific "base" directory (e.g., realpath() in PHP or path.resolve() in Node.js). : Modern WAFs are designed to detect and
: This represents /root/ , the home directory for the system administrator (root user) on Linux-based systems. Why This Vulnerability Exists : This represents /root/ , the home directory
: This is the URL-encoded version of ../ . By repeating this sequence, the attacker moves up several levels.
If the back-end code takes that page parameter and plugs it directly into a file system call without checking it, an attacker can swap contact.html with our keyword string. The server might then attempt to "include" a sensitive system file, such as /etc/passwd , and display its contents to the attacker. The Risks of Improper File Handling A successful traversal attack can lead to: