Fetch-url-file-3a-2f-2f-2froot-2f.aws-2fconfig _top_ Jun 2026

SSRF occurs when an application can be tricked into sending an unauthorized HTTP request to an unintended destination. Attackers exploit this by changing URL parameters to point to internal or local system files, such as file:///root/.aws/config . Why Attackers Target AWS Config Files

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

file. This attack attempts to expose internal AWS configuration data, such as account profiles and regions. To prevent unauthorized access, developers must sanitize inputs and use IAM roles for EC2 or ECS, which eliminate the need to store credentials on the host. Amazon AWS Documentation Authentication and access credentials for the AWS CLI

: The attacker inputs the encoded string: https://example.com . fetch-url-file-3A-2F-2F-2Froot-2F.aws-2Fconfig

So the decoded string is:

Deploy WAF rules to block file:// patterns, including URL-encoded forms:

Organizations can secure their endpoints against local file inclusion and SSRF vectors by enforcing strict input parsing and system rules. 1. Implement Strict Input Validation and Whitelisting SSRF occurs when an application can be tricked

: The attacker is trying to force the application to execute a request to file:///root/.aws/config .

[profile prod] region = eu-west-1 output = json

To prevent this type of exploit, implement the following security measures: This attack attempts to expose internal AWS configuration

Never trust user-supplied URLs or file paths. Implement strict allowlists for allowed schemes (e.g., http and https only). Reject file:// , gopher:// , dict:// , ftp:// , and other dangerous schemes. For example:

SecRule ARGS "file\:\/\/" "id:1001,deny,status:403,msg:'Blocked file:// URI'" SecRule ARGS "(?i)(%66%69%6c%65%3a%2f%2f|file\:\/\/)" "id:1002,deny"

The keyword fetch-url-file-3A-2F-2F-2Froot-2F.aws-2Fconfig refers to a specific type of attack pattern known as . In this scenario, an attacker attempts to force a server to "fetch" a local file—specifically the AWS configuration file located at /root/.aws/config —using a URL-encoded path.

This specific attack path aims to breach a cloud-hosted infrastructure by forcing a server to read its own local AWS CLI configuration files . If successful, an attacker can pivot from compromising a single vulnerable web application to hijacking an entire Amazon Web Services (AWS) cloud environment. Decoding the Payload: Anatomy of the Attack

The problem arises when an application exposes a feature – a function that accepts a user-supplied URL, retrieves its content, and returns it to the user. This is common in: