Given that, I’ll write a long, informative article explaining what this string represents, the security risk it implies, how attackers use such patterns, and how to protect against path traversal and credential exposure attacks. Introduction At first encounter, the string -file-..-2F..-2F..-2F..-2Fhome-2F-2A-2F.aws-2Fcredentials looks like gibberish. However, to a security professional or a seasoned developer, it immediately raises red flags. This is an obfuscated path traversal payload targeting one of the most sensitive files on a Unix-based system: the AWS credentials file.
It attempts to reach: ../../../../home/*/.aws/credentials
At first glance, this looks like a URL-encoded or escaped path traversal pattern attempting to reference a file at /home/*/.aws/credentials — a critical file containing AWS access keys and secret keys. -file-..-2F..-2F..-2F..-2Fhome-2F-2A-2F.aws-2Fcredentials
filename = request.args.get('file') with open('/var/log/app/' + filename, 'r') as f: return f.read() An attacker sends:
The backend code:
In a typical Linux system, * would be expanded by the shell or application logic to match any username (e.g., ubuntu , ec2-user , admin , user ). So the attacker is trying to read credentials for on the system. Part 2: What Is Path Traversal? Path traversal (also known as directory traversal) is a vulnerability that allows an attacker to access files and directories stored outside the web root folder. By manipulating variables that reference files with “dot-dot-slash ( ../ )” sequences and its variants, an attacker can access arbitrary files on the server.
-file-..-2F..-2F..-2F..-2Fhome-2F-2A-2F.aws-2Fcredentials Given that, I’ll write a long, informative article
In our encoded case, the attacker is trying to bypass naïve filters that might remove ../ by using URL encoding %2F (or in the given string, -2F as a hypothetical custom encoding) to evade detection. The .aws/credentials file is created by the AWS CLI, SDKs, and tools like aws configure . It stores: