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

A vulnerable PHP endpoint might contain:

$page = $_GET['page'];
include("/var/www/html/" . $page);

An attacker submits ?page=....-2F-2F....-2F-2F....-2F-2Fetc-2Fpasswd. After URL decoding, the server builds:
/var/www/html/../../../../etc/passwd → normalized to /etc/passwd.

The /etc/passwd file is a critical text file in Unix-like operating systems, including Linux. It contains a list of all registered users on the system. For each user, the file provides a line with a specific format that includes:

The general format is:

username:password:UID:GID:GECOS:home_directory:shell

Path traversal (directory traversal) attacks allow attackers to access arbitrary files by manipulating input that is concatenated with a base directory. This paper examines a specific encoded payload, decodes it, explains how it works against vulnerable web parameters, and discusses detection and prevention.

In conclusion, while the /etc/passwd file itself isn't malicious, the context in which it's accessed or exposed can lead to security concerns. Always follow best practices in securing sensitive information and protecting against common web application vulnerabilities.

Path traversal attacks, often utilizing encoded characters like %2F to bypass filters, pose a severe security risk by allowing unauthorized access to sensitive system files. Developers can mitigate this risk by validating user input, employing allowlisting, using secure filesystem APIs, and enforcing the principle of least privilege. AI responses may include mistakes. Learn more -page-....-2F-2F....-2F-2F....-2F-2Fetc-2Fpasswd

CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Attackers use sequences like ../ to move up directories and access files outside the web root.

Example vulnerable code (PHP):

$page = $_GET['page'];
include("/var/www/pages/" . $page . ".php");

If page=../../../etc/passwd%00 (null byte injection in older PHP), the server might read /etc/passwd.

Successful exploitation exposes sensitive system files (e.g., /etc/passwd, /etc/shadow, application config files). Combined with other flaws, it can lead to remote code execution.

The attacker used -2F instead of %2F (standard URL encoding) or / directly. This could be: A vulnerable PHP endpoint might contain: $page =

Similar bypasses include:

The purpose of this report is to analyze the provided string as a cybersecurity indicator, explain: