Fetch-url-file-3a-2f-2f-2froot-2f.aws-2fconfig [top] <2026 Update>

And they will also attempt to read /etc/passwd , /proc/self/environ , and other system files to gather more information. The file:// scheme is just the tip of the iceberg.

While having a configured CLI is convenient for local development, storing AWS credentials and configuration files on the disk of a production server, VM, or container is widely considered a . IAM Roles and Instance Profiles

This article breaks down what this payload means, how the underlying vulnerability works, and how organizations can defend their cloud infrastructure against it. Decoding the Payload

[default] region = us-east-1 output = json

Only use with permission:

The PHP file_get_contents() happily reads /root/.aws/config and returns its content (if the web server runs as root or has read permissions). The attacker sees the AWS credentials in the HTTP response.

allow_url_fopen = Off

| Situation | Action | |-----------|--------| | Need to read /root/.aws/config manually | Use sudo cat or sudo ls | | Accessing via file:// URI in code | Avoid; use filesystem APIs instead | | Want to share config across services | Use IAM roles, not root credentials | | Running in Docker/LXC | Do not store root AWS keys inside container |

Modern browsers restrict fetch() on file:// URIs due to cross-origin security policies. However, in server-side JavaScript (Node.js with node-fetch or axios ), there is no such restriction. An attacker who can control a server-side fetch call (e.g., through a parameter passed to an API endpoint) can read arbitrary files. fetch-url-file-3A-2F-2F-2Froot-2F.aws-2Fconfig

They learn which AWS regions the server actively interacts with.

If missing, run:

Or, as seen in our keyword, using -3A instead of %3A (some custom encoding schemes). The defensive filter sees no forbidden words, passes the string, and the application decodes it before passing to the file-read function – .

Unauthorized access to AWS Account IDs, region configurations, and potentially IAM role profiles. Technical Breakdown 1. URL Encoding Analysis And they will also attempt to read /etc/passwd

: Use firewalls or VPC security groups to restrict the server’s ability to make outgoing requests to internal IP addresses or sensitive local files.

This specific string represents an exploit attempt designed to abuse features like Server-Side Request Forgery (SSRF) or Local File Inclusion (LFI) to steal cloud credentials from an administrative Linux root directory.

If you are managing Linux servers, containers, or web applications, safeguarding files like /root/.aws/config involves a layered defense approach:

: When decoded, -2F translates to a forward slash ( / ). This resolves to the absolute file path: /root/.aws/config . IAM Roles and Instance Profiles This article breaks

The Underlying Vulnerability: Server-Side Request Forgery (SSRF)

: Defines the specific IAM role the system should assume. Security Implications of the root Directory