: This specific filter tells PHP to take the contents of the target file and encode them into a Base64 string before delivering them to the application.
$filePath = '/root/.aws/credentials'; $fileContent = readFile($filePath);
: Long-term credentials used to authenticate requests to AWS services. : This specific filter tells PHP to take
:
$allowed_pages = ['home', 'about', 'contact']; if (in_array($_GET['page'], $allowed_pages)) include("pages/" . $_GET['page'] . ".php"); $_GET['page']
By implementing this feature, you ensure that your AWS credentials are handled securely within your PHP application, reducing the risk of credential exposure.
| Payload variant | Purpose | |----------------|---------| | php://filter/convert.base64-encode/resource=/etc/passwd | Read system users | | php://filter/convert.base64-encode/resource=/var/www/html/config.php | Read DB passwords | | php://filter/convert.base64-encode/resource=/proc/self/environ | Read process env vars (may leak API keys) | | expect://id | Code execution (if expect module loaded) | sushant747
This type of attack succeeds when a web application takes user input and passes it directly to file-system functions like file_get_contents() without proper sanitization or allowlisting. sushant747.gitbooks.io Prevention and Security To defend against such LFI attacks, developers should: