# Dangerous - allows path traversal user_path = "file:///root/.aws/config" open(user_path.replace("file://", ""), "r")
The input file:///root/.aws/config represents a high-risk Local File Inclusion (LFI) attempt designed to steal AWS credentials, often exploited through SSRF vulnerabilities. To defend against this, applications should use strict allow-lists for inputs, restrict network protocols, and avoid running as root to prevent unauthorized file access.
It may contain role_arn mappings, allowing an attacker to figure out which cross-account IAM roles the server is authorized to assume.
This payload is a URL-encoded instruction used in attacks. Let's break it down:
: Located in the same directory, this companion file holds the actual aws_access_key_id and aws_secret_access_key . If an attacker can read config , they will invariably request credentials next. Mechanics of the Attack: LFI and SSRF fetch-url-file-3A-2F-2F-2Froot-2F.aws-2Fconfig
Whether your application runs on architecture?
: Enable detailed logging or debugging for the tool or script you're using. This can provide more insight into what's going wrong.
So file-3A-2F-2F-2Froot-2F.aws-2Fconfig becomes file:///root/.aws/config after replacing -3A with : , -2F with / , and noting that -2F appears three times consecutively: -2F-2F-2F → /// .
This path seems to be referencing a configuration file for AWS (Amazon Web Services) located in a .aws directory. # Dangerous - allows path traversal user_path =
With this structural footprint, an attacker can precisely craft subsequent attacks to target the companion .aws/credentials file or probe the AWS Instance Metadata Service (IMDS) to extract short-term IAM session tokens. Remediation and Defensive Strategies
Moreover, even if the config file only references a profile, it almost always coexists with /root/.aws/credentials . An attacker who can read /root/.aws/config can often guess or traverse to /root/.aws/credentials .
: The AWS CLI (Command Line Interface) uses a configuration file to store access keys, region, and other settings. This file is usually located at ~/.aws/credentials for credentials and ~/.aws/config for configuration. The URL could be pointing to a non-standard location or a specific organizational setup.
When fully decoded, the string translates to: fetch-url-file:///root/.aws/config Anatomy of the Targeted File This payload is a URL-encoded instruction used in attacks
from urllib.parse import urlparse
Applications should never run under the root user context. Run your web servers (Nginx, Apache, Node.js) under low-privileged system accounts (e.g., www-data ). Even if an LFI vulnerability exists, a low-privileged user will be blocked by Linux file permissions from reading /root/.aws/config . Adopt IMDSv2 for Cloud Instances
: On AWS, enforce the use of IMDSv2 (Instance Metadata Service version 2), which requires a session-oriented token and prevents most SSRF attempts from reaching sensitive metadata.