-page-....-2f-2f....-2f-2f....-2f-2fetc-2fpasswd [cracked] ⇒

Blog Post: Understanding the /etc/passwd File in Unix-Linux Systems

Introduction

When a web server processes this string, it often decodes it into a path like this: The Goal: ../../../../etc/passwd. -page-....-2F-2F....-2F-2F....-2F-2Fetc-2Fpasswd

-page-: This usually refers to a parameter in a URL (e.g., ://example.com...). Attackers target these parameters because they often control which file the server loads. Blog Post: Understanding the /etc/passwd File in Unix-Linux

If page=../../../etc/passwd%00 (null byte injection in older PHP), the server might read /etc/passwd. Path Traversal Attacks : An attacker uses the

1. Path Traversal Attacks: An attacker uses the URL to traverse the directory structure of a vulnerable web server, ultimately reaching the /etc/passwd file. This can be done to extract sensitive information or to use it as a stepping stone for further attacks.
2. Command Injection: The URL is used to inject malicious commands or scripts, which are then executed by the server. This could lead to code execution, data breaches, or system compromise.
3. Information Disclosure: The URL is crafted to disclose sensitive information, such as the contents of the /etc/passwd file, directly to the attacker.

Use built-in language functions that prevent escaping the base directory. For example, in PHP, avoid passing user input directly to file_get_contents() Security Headers & WAF Rules: Deploy rules on a Cloudflare

, eventually reading and displaying the password file to the attacker. The Impact of a Successful Attack If an attacker successfully reads /etc/passwd , the consequences can be severe:

Sanitization: Automatically strip out characters like . and / from user-provided filenames.