The target of this payload is the default configuration file for the Amazon Web Services (AWS) Command Line Interface (CLI) under the root user profile. Target File Typical Contents Impact of Exposure Default AWS regions, output formats, and IAM role profiles.
The string file-3A-2F-2F-2Froot-2F.aws-2Fconfig is a specific, highly targeted variation aimed at the root AWS configuration file. It shows that the attacker has prior knowledge of Linux filesystem structure and AWS CLI default paths.
If the file config is accessible, it often points to or includes the credentials file, which literally holds aws_access_key_id and aws_secret_access_key . fetch-url-file-3A-2F-2F-2Froot-2F.aws-2Fconfig
This article decodes the string, explains the significance of /root/.aws/config , demonstrates how attackers exploit such patterns, and provides a step-by-step guide to remediation.
To prevent this type of exploit, implement the following security measures: The target of this payload is the default
file:///root/.aws/config
Alex had just learned about the importance of securely storing AWS credentials and had read about the default credential chain that AWS SDKs use. Part of this chain involves checking for a config file (or credentials file) in the .aws directory of the user's home directory. It shows that the attacker has prior knowledge
But if the application prefixes a directory or uses a wrapper, a file:// URI can bypass restrictions:
Are you looking for a specific script to parse or validate this file? Let me know in the comments below!
If the application fails to restrict requests to external web addresses ( http:// or https:// ), the backend server will parse the file:// schema natively. If the web server process happens to run with root privileges, the application reads the system's root directory and prints the contents of .aws/config right back to the attacker. How to Detect and Remediate SSRF Attacks
The string "fetch-url-file-3A-2F-2F-2Froot-2F.aws-2Fconfig" is a URL-encoded payload typically used in Server-Side Request Forgery (SSRF) attacks to extract sensitive cloud configuration data. Decoding the Request When decoded, the string translates to: fetch-url-file:///root/.aws/config