[default] aws_access_key_id = AKIAIOSFODNN7EXAMPLE aws_secret_access_key = wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY
This paper explores the technical mechanics, security implications, and mitigation strategies related to the Local File Inclusion (LFI) payload: php://filter/read=convert.base64-encode/resource=/root/.aws/credentials .
A: Yes. zip:// , phar:// , expect:// , and ftp:// (if allow_url_fopen is on) can all lead to code execution or information disclosure. Always disable unused wrappers.
Open
When a vulnerable PHP script (e.g., include($_GET['file']); ) uses this string as a file path, PHP will return the of the AWS credentials file. The attacker can then decode the base64 data to obtain plaintext AWS access keys and secret keys.
The string you provided describes a attack vector that utilizes a PHP filter wrapper to exfiltrate sensitive data. Specifically, it attempts to read the AWS credentials file by encoding it into Base64 to bypass security filters that might otherwise block raw text transmission. Technical Breakdown of the Payload
is a Local File Inclusion (LFI) attack designed to exfiltrate AWS credentials by using PHP stream filters to base64-encode sensitive files [1]. This attack enables unauthorized access to AWS Access Key IDs and Secret Access Keys, potentially leading to full cloud environment compromise, and should be mitigated by disabling allow_url_include Always disable unused wrappers
: Ensure your web server (e.g., Apache, Nginx) runs as a low-privilege user (like www-data ) and cannot access sensitive directories like /root .
: If your PHP application runs on Amazon EC2, never store hardcoded credentials in ~/.aws/credentials . Instead, use IAM Roles for EC2 and enforce Instance Metadata Service Version 2 (IMDSv2) to safely distribute temporary, rotating credentials to the application.
If you absolutely need to dynamically include files based on user input (e.g., a theming system), map the input to a safe identifier: The string you provided describes a attack vector
The payload also includes -view-php- at the beginning, which is likely an artifact from a plugin, theme, or custom routing mechanism (e.g., ?page=view-php ). Removing that prefix and decoding the rest gives us:
view.php?file=php://filter/convert.base64-encode/resource=/root/.aws/credentials 2. The Mechanics of php://filter
function encodeCredentials($accessKeyId, $secretAccessKey) $credentials = $accessKeyId . ':' . $secretAccessKey; $encodedCredentials = base64_encode($credentials); return $encodedCredentials; ':' . $secretAccessKey