-page-....-2f-2f....-2f-2f....-2f-2fetc-2fpasswd -

: This is a combination of URL encoding and path traversal techniques. -2F is the URL-encoded representation of a forward slash / .

Never trust user input. Use "allow-lists" to ensure the application only opens a specific set of predefined files. -page-....-2F-2F....-2F-2F....-2F-2Fetc-2Fpasswd

Preventing path traversal requires a "defense-in-depth" approach, ensuring that input is never trusted. 1. Validate Input (Whitelist Approach) : This is a combination of URL encoding

At first glance, this string appears cryptic – but once decoded, it reveals a classic path‑traversal attempt targeting the Unix/Linux password file. In this article, we’ll break down how such attacks work, why obfuscation techniques like -2F-2F (URL encoding for // ) and multiple .. (dot‑dot) sequences are used, and – most importantly – how to defend your applications against them. Use "allow-lists" to ensure the application only opens

A real‑world scenario might look like this:

: This is the ultimate target. On Unix/Linux systems, /etc/passwd is a file that contains information about all user accounts on the system. While it often doesn't contain the actual passwords (which are usually in /etc/shadow ), it lists usernames, user IDs, and home directories, which is critical intelligence for an attacker.