: Attackers can use the stolen keys to access S3 buckets (data theft), launch EC2 instances (cryptomining), or delete infrastructure (ransomware).
The payload in his hand wasn’t an artifact anymore.
If using IAM roles, ensure your instances use rather than the legacy IMDSv1. IMDSv2 utilizes session-oriented requests, preventing attackers from SSRF (Server-Side Request Forgery) or local file read vulnerabilities to scrape metadata tokens easily. 3. Secure the Application Code Fix file handling vulnerabilities in the application layer:
The provided string is a URL-encoded path traversal attack payload designed to exploit improper file path handling in web applications.
import os
[Vulnerable Web App] ──> [Path Traversal Exploitation] ──> [Plaintext Credentials Stolen] ──> [Full AWS Cloud Takeover] Path Traversal to AWS credentials to S3 — Walkthrough
grep -E "\.\./.*\.aws/credentials" /var/log/nginx/access.log
: Replace all instances of 2F with / .
# Then process the path import os actual_path = os.path.join('/', decoded_path) -file-..-2F..-2F..-2F..-2Fhome-2F-2A-2F.aws-2Fcredentials
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.
When developers install the AWS Command Line Interface (CLI) or certain SDKs, the system generates a hidden directory named .aws in the user's home directory ( ~/.aws/ ). Inside this directory, the credentials file stores plain-text authentication tokens.
encoded_path = "-file-..-2F..-2F..-2F..-2Fhome-2F-2A-2F.aws-2Fcredentials"
When developers or administrators configure the AWS CLI on a server, the system creates a hidden directory named .aws inside the user's home folder. Inside this folder sits a plain-text file named credentials . This file typically contains: : Attackers can use the stolen keys to
The file contains and Secret Access Key in plain text:
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To understand why this string is so dangerous, we have to break down its technical components:
