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The string you've provided appears to represent a file path that's been URL-encoded. Let's break it down to understand what it represents:
-file-..-2F..-2F..-2F..-2Fhome-2F-2A-2F.aws-2Fcredentials
Here's the decoding process:
URL Decoding: The string contains 2F which is the URL-encoded representation of /, and - remains -.
Decoding 2F: Replace all instances of 2F with /.
The decoded string then becomes:
-file-../../../../home/*/.aws/credentials
Let's further simplify this:
* in the path is a wildcard character that can match any characters (or none) in a specific part of the path.So, the path seems to be pointing to a .aws/credentials file in a home directory, but it uses a lot of parent directory navigation (../) and a wildcard (*).
The .aws/credentials file typically holds AWS credentials for accessing AWS services. This file is crucial for developers and AWS CLI users to authenticate and interact with AWS resources.
The path suggests a rather indirect way of pointing to the .aws/credentials file, possibly to avoid hard-coding a direct path. However, using such a dynamically referenced path can lead to security vulnerabilities if not properly sanitized, especially if the string is interpreted or executed by a program.
The .aws/credentials file is a critical component for developers and administrators working with AWS services. Following best practices for managing and securing this file is essential to maintaining the security of your AWS resources. Always use IAM roles and temporary security credentials where possible, and rotate your access keys regularly.
This specific string looks like a Local File Inclusion (LFI) or Path Traversal exploit payload used to exfiltrate AWS credentials from a vulnerable web server.
Below is a technical write-up of the vulnerability and the attack vector represented by that string. Vulnerability Overview: Path Traversal
Path traversal (or directory traversal) is a web security vulnerability that allows an attacker to read arbitrary files on the server that is running an application. This typically occurs when an application uses user-supplied input to construct a file path without sufficient validation. Exploit Breakdown
The payload -file-..-2F..-2F..-2F..-2Fhome-2F-2A-2F.aws-2Fcredentials can be decoded and analyzed as follows:
..-2F (URL Encoded ../): The %2F (encoded as -2F in some specific application filters) represents a forward slash. The ../ sequence is a "step up" in the directory tree. Using multiple sequences (e.g., ../../../../) allows the attacker to reach the root directory (/) from a nested web folder.
/home/: This targets the user directory on a Linux-based system. -file-..-2F..-2F..-2F..-2Fhome-2F-2A-2F.aws-2Fcredentials
-2A-2F (URL Encoded */): The wildcard * is often used to attempt to find any user’s home directory if the specific username is unknown.
.aws/credentials: This is the standard file path for AWS CLI credentials. This file contains sensitive information, including aws_access_key_id and aws_secret_access_key.
If successful, this attack results in a Critical Information Disclosure. An attacker who obtains these credentials can:
Gain Unauthorized Access: Authenticate as the compromised user to the AWS environment.
Escalate Privileges: If the compromised credentials have high-level permissions (e.g., AdministratorAccess), the attacker can take over the entire cloud infrastructure.
Exfiltrate Data: Access S3 buckets, databases (RDS), or other sensitive cloud services. Remediation Strategies
To prevent this type of attack, developers should implement the following security controls:
Input Validation: Use a "whitelist" of permitted file names or extensions. Never trust user input to define a path.
Use Filesystem APIs: Instead of manual path concatenation, use built-in language functions that resolve paths safely and prevent "stepping out" of the intended directory.
Principle of Least Privilege: Ensure the web server process (e.g., www-data or apache) does not have read permissions for sensitive system files or other users' home directories.
IMDSv2: If the server is an EC2 instance, use Amazon EC2 Instance Metadata Service Version 2 (IMDSv2), which requires a session token and is resistant to SSRF and LFI-based credential theft.
Payload Type: Directory Traversal (or Path Traversal) attack.
Target File: ~/.aws/credentials, which typically contains sensitive information like aws_access_key_id and aws_secret_access_key. The Path:
..-2F is a URL-encoded version of ../, used to navigate up the directory tree.
The string ..-2F..-2F..-2F..-2F is an attempt to reach the root directory (/) from an unknown starting point.
home-2F-2A-2F translates to /home/*/, where the * (asterisk) is a wildcard meant to catch any user's home directory. Security Assessment
Risk Level: Critical. If a web application or API is vulnerable to this traversal, an attacker could read your AWS Credentials directly from the server's file system. The string you've provided appears to represent a
Impact: Compromise of these credentials allows an attacker to perform actions in your AWS Account with the permissions assigned to that user (e.g., deleting data, launching expensive instances, or stealing sensitive database info).
Detection: This is a common pattern flagged by Web Application Firewalls (WAFs) and security scanners like those from Veracode or Checkmarx. Recommended Actions
Sanitize Inputs: Ensure your application does not allow users to provide paths that contain ../ or encoded equivalents.
Use IAM Roles: If this is running on an Amazon EC2 instance, use IAM Roles for EC2 instead of storing hardcoded keys in a .aws/credentials file.
Rotate Keys: If you suspect this payload was successfully executed against your environment, rotate your AWS access keys immediately.
Are you seeing this in your server logs, or are you testing a security scanner?
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This specific string pattern, "-file-..-2F..-2F..-2F..-2Fhome-2F-2A-2F.aws-2Fcredentials", is a signature of a Path Traversal (or Local File Inclusion) vulnerability, typically exploited via a URL-encoded payload to exfiltrate sensitive cloud provider secrets. Vulnerability Overview
The payload uses directory traversal sequences (../ or encoded as ..-2F) to "break out" of the intended application directory and access the root filesystem. The goal is to reach the .aws/credentials file, which contains plain-text aws_access_key_id and aws_secret_access_key tokens. Write-up: Exfiltrating AWS Credentials via Path Traversal Vulnerability Class: Path Traversal / Arbitrary File Read. Target File: /home/[user]/.aws/credentials. Payload Mechanism:
..-2F: URL-encoded version of ../. This bypasses basic client-side or web application firewall (WAF) filters that only look for literal dots and slashes. URL Decoding : The string contains 2F which
-2Fhome-2F-2A-2F: Encoded path for /home/*/. The asterisk (*) is often used in certain contexts or bypass attempts to glob-match any user directory if the specific username is unknown. 1. Identification
The vulnerability is often found in endpoints that take a filename or path as a parameter, such as:
The string you've provided, -file-..-2F..-2F..-2F..-2Fhome-2F-2A-2F.aws-2Fcredentials, appears to be a path that has been URL-encoded. Let's decode it to understand what it represents:
The URL-encoded string: -file-..-2F..-2F..-2F..-2Fhome-2F-2A-2F.aws-2Fcredentials
When decoded:
-file- remains as is, suggesting a filename or a reference to a file...-2F decoded becomes ../, which is a way to navigate to the parent directory in a file system...-2F results in ../../, then ../../../, and so on, indicating navigation up the directory tree.home-2F decodes to home/, indicating a path inside the home directory.2A-2F decodes to */, where * is a wildcard character that can represent any file or directory name, and / continues the path..aws-2Fcredentials decodes to .aws/credentials, which is a specific file path commonly used in AWS (Amazon Web Services) for storing access keys.So, the decoded path seems to be suggesting access to a file located at home/*/\.aws/credentials. The * is a wildcard, implying any directory or file could potentially be inserted there.
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.
Example vulnerable code (PHP):
$file = $_GET['file'];
include('/var/www/html/' . $file);
If no validation is done, requesting:
index.php?file=../../../../home/user/.aws/credentials
will include the credentials file.
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.
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.
In this article, we will:
.aws/credentials is dangerous.The seemingly cryptic string -file-..-2F..-2F..-2F..-2Fhome-2F-2A-2F.aws-2Fcredentials is a cleverly obfuscated path traversal attempt aimed at stealing AWS credentials. It underscores the importance of:
In cloud-native environments, the compromise of .aws/credentials is a direct gateway to account takeover. Treat every attempt — even a single log line — as a potential breach signal.
Stay vigilant, sanitize your paths, and keep your credentials out of reach.
CWE-22: Path Traversal
CWE-73: External Control of File Name/Path
CVSS 3.x: 7.5-9.8 (High/Critical depending on context)
*) Is InterestingThe -2A decodes to *. If the application globs the path (e.g., using glob.glob() in Python), */.aws/credentials would match:
/home/user1/.aws/credentials/home/admin/.aws/credentials/home/ec2-user/.aws/credentialsThe attacker may not know the exact username, so they use * to try all possibilities. If the application returns the first match or concatenates contents, the attack succeeds.