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
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. -page-....-2F-2F....-2F-2F....-2F-2Fetc-2Fpasswd
The purpose of this report is to analyze the provided string as a cybersecurity indicator, explain:
Given input:
-page-....-2F-2F....-2F-2F....-2F-2Fetc-2Fpasswd
....// in many URL parsers or path normalization functions (especially on older or misconfigured systems) collapses to ../ because: The /etc/passwd file is a critical text file
So the effective path becomes:
-page-../../../etc/passwd
If the web application does something like:
/var/www/html/page- + user input + .html
Then the attacker might inject ../../../etc/passwd to read system files.
The string -page-....-2F-2F....-2F-2F....-2F-2Fetc-2Fpasswd is a URL-encoded directory traversal attack attempting to read /etc/passwd. It represents a real and common web security threat. Organizations should implement proper input validation, path sanitization, and monitor logs for such patterns. A vulnerable PHP endpoint might contain: $page =
If found in your logs, assume an attacker probed for file read vulnerabilities. Investigate the surrounding requests and the affected endpoint.
Example safe code (Python):
import os
base = '/var/www/pages/'
req = request.GET['page']
safe = os.path.realpath(os.path.join(base, req))
if not safe.startswith(base):
raise Forbidden()
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 observed payload is:
-page-....-2F-2F....-2F-2F....-2F-2Fetc-2Fpasswd
The -page- suggests a parameter name or delimiter, while each .. escapes one directory level. The final target is /etc/passwd (a Unix file listing user accounts).