Fetch-url-file-3a-2f-2f-2froot-2f.aws-2fconfig !exclusive!

def fetch_url(url): response = requests.get(url) # Dangerous! return response.text

Worse, some systems decode input multiple times (double decoding). An attacker might send:

aws s3 cp s3://your-bucket-name/configfile /local/path/configfile

Some PHP or web applications allow including local files via parameters like ?page=home . If the application does not sanitize input, an attacker might try: fetch-url-file-3A-2F-2F-2Froot-2F.aws-2Fconfig

curl -v "https://your-app.com/page?file=file:///root/.aws/config"

aws configure set aws_access_key_id AKIAIOSFODNN7EXAMPLE aws configure set aws_secret_access_key wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY aws s3 ls

Check:

Request: index.php?file=file:///root/.aws/config

In your HTTP client configuration, explicitly forbid file:// , gopher:// , dict:// , and other non-standard schemes. For example:

: 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 def fetch_url(url): response = requests

The path mentioned in your fetch request ( /root/.aws/config ) suggests the file is owned by the root user. This raises a massive red flag:

Applications that render remote content in a WebView and allow custom URL schemes can be tricked into loading local files. For example, an Electron app that opens a file:// URL without sandboxing could leak the AWS config file.

URL encoding (percent-encoding) replaces unsafe ASCII characters with a % followed by two hexadecimal digits. However, the string above uses a slightly different representation: 3A for colon ( : ), 2F for slash ( / ). Let’s decode step by step: If the application does not sanitize input, an

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