-page-....-2f-2f....-2f-2f....-2f-2fetc-2fpasswd | !!hot!!

The string ....-2F-2F....-2F-2F....-2F-2Fetc-2Fpasswd is a malicious payload used in Path Traversal attacks to bypass security filters and read restricted system files. It utilizes nested traversal techniques and URL encoding ( ) to access sensitive information like /etc/passwd . For more details on these vulnerabilities, visit InfoSec Write-ups

username:x:UID:GID:GECOS:home_directory:login_shell

6. Possible Attack Flow

1. Attacker finds a parameter like ?page=index
2. Tests payload: ?page=....//....//....//etc/passwd
3. If response contains root:x:0:0:..., the vulnerability exists
4. Attacker escalates to reading config files, source code, SSH keys, or using LFI (Local File Inclusion) to RCE (Remote Code Execution)

a practical guide to path traversal and arbitrary file read attacks -page-....-2F-2F....-2F-2F....-2F-2Fetc-2Fpasswd

Introduction

Mitigation:

• Never trust user input for filesystem paths
• Use allowlists for filenames
• Use basename() or path canonicalization (realpath) and check if under base directory
• Run web server in chroot/jail/container with minimal privileges
• Disable unnecessary PHP functions like include() with user-controlled input

Alex immediately suspected that the email was a phishing attempt or a clue left by a malicious actor. They quickly gathered their team and began to investigate. The string