-template-..-2f..-2f..-2f..-2froot-2f.aws-2fcredentials Jun 2026

To understand how this attack functions, the payload must be broken down into its component parts:

// A vulnerable Node.js snippet const template = req.query.name; res.sendFile(`/app/templates/$template`); Use code with caution. Copied to clipboard

Directory traversal (also known as path traversal) is an exploit targeting applications that accept user-supplied filenames or paths without proper sanitization. Path Traversal Mechanics

In the payload string provided, the sequence ..-2F..-2F..-2F..-2F uses a hyphenated variation or system-specific interpretation of URL encoding ( -2F instead of %2F ). This technique targets parsers that incorrectly decode alternative separators, allowing the traversal sequence to pass through standard text filters undetected before being interpreted by the underlying operating system file extractor. The Target: Inside the .aws/credentials File

The cloud has made powerful infrastructure accessible, but with that power comes responsibility. A single missing realpath() check could hand an attacker complete control over your AWS account. Don’t let a string like ..-2F..-2F..-2Froot-2F.aws-2Fcredentials become the reason for your next incident report. -template-..-2F..-2F..-2F..-2Froot-2F.aws-2Fcredentials

: This is the "holy grail" for an attacker targeting AWS infrastructure. It is the default location where the AWS Command Line Interface (CLI) stores sensitive access keys ( aws_access_key_id ) and secret keys ( aws_secret_access_key ). How the Vulnerability Occurs

: Likely a placeholder or a prefix required by the specific application's routing logic or parameter naming. : This is a URL-encoded version of is the "parent directory" command. (or more commonly ) is the encoded forward slash The Chain ( ..-2F..-2F..-2F..-2F

This looks like a keyword associated with a potential security vulnerability or a specific, likely misguided, configuration in an AWS environment—specifically involving directory traversal ( ..-2F which translates to ../ ) to access the root user's AWS credentials file.

: The public identifier for the AWS account/user. To understand how this attack functions, the payload

Never accept arbitrary file paths from users. Maintain a strict whitelist of allowed template names (e.g., ['home', 'about', 'contact'] ). Reject any input that does not match.

If basic ../ is blocked, try:

Understanding the Local File Inclusion (LFI) and Path Traversal Vulnerability: Analysis of ..-2F Payloads

Regular API interactions occurring via unexpected toolkits, scripts, or non-standard command-line interfaces. Mitigation and Prevention Best Practices Don’t let a string like

All these are vulnerable because file can contain ../ sequences.

Sometimes the web server process lacks permission to read /root/.aws/credentials , but the attacker can still obtain the keys through other means:

This path seems to point to an AWS credentials file, which is crucial for AWS CLI and SDK operations. The file typically contains:

The operating system resolves the relative path, steps completely out of /var/www/html/templates/ , and prints the contents of the AWS credentials file directly to the attacker’s web browser. Remediation and Mitigation Strategies