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IT Security and Insecurity Portal |
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Possible Rfi? Shed Some light Please! |
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 Posted: Thu Oct 09, 2008 4:25 pm |
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| Cablekid |
| Advanced user |
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| Joined: Jul 14, 2007 |
| Posts: 85 |
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Help me out.
Alright, i have a website that lets you upload image files.
I found out if you do http://site.com/insert_image.php?dir=..%2F..
It shows you the directory and it also lets you upload an image to that directory.
So my question is, is their any other way to maybe use a shell? I was thinking about uploading a shell but in the config.php it defines only jpgs and gifs
| Code: | require('config.inc.php');
error_reporting(0);
// get the identifier of the editor
$wysiwyg = $_GET['wysiwyg'];
// set image dir
$leadon = $rootdir.$imagebasedir;
if($leadon=='.') $leadon = '';
if((substr($leadon, -1, 1)!='/') && $leadon!='') $leadon = $leadon . '/';
$startdir = $leadon;
// validate the directory
$_GET['dir'] = $_POST['dir'] ? $_POST['dir'] : $_GET['dir'];
if($_GET['dir']) {
if(substr($_GET['dir'], -1, 1)!='/') {
$_GET['dir'] = $_GET['dir'] . '/';
}
$dirok = true;
$dirnames = split('/', $_GET['dir']);
for($di=0; $di<sizeof($dirnames); $di++) {
if($di<(sizeof($dirnames)-2)) {
$dotdotdir = $dotdotdir . $dirnames[$di] . '/';
}
}
if(substr($_GET['dir'], 0, 1)=='/') {
$dirok = false;
}
if($_GET['dir'] == $leadon) {
$dirok = false;
}
if($dirok) {
$leadon = $_GET['dir'];
}
}
// upload file
if($allowuploads && $_FILES['file']) {
$upload = true;
if(!$overwrite) {
if(file_exists($leadon.$_FILES['file']['name'])) {
$upload = false;
}
}
$ext = strtolower(substr($_FILES['file']['name'], strrpos($_FILES['file']['name'], '.')+1));
if(!in_array($ext, $supportedextentions)) {
$upload = false;
}
if($upload) {
move_uploaded_file($_FILES['file']['tmp_name'], $leadon . $_FILES['file']['name']);
}
}
if($allowuploads) {
$phpallowuploads = (bool) ini_get('file_uploads');
$phpmaxsize = ini_get('upload_max_filesize');
$phpmaxsize = trim($phpmaxsize);
$last = strtolower($phpmaxsize{strlen($phpmaxsize)-1});
switch($last) {
case 'g':
$phpmaxsize *= 1024;
case 'm':
$phpmaxsize *= 1024;
}
}
?>
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[/u] |
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| Posted: Thu Oct 09, 2008 4:37 pm |
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| lenny |
| Valuable expert |
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| Joined: May 15, 2008 |
| Posts: 275 |
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| Do you have the entire source code? You could try to upload a php file with the image/jpeg content type - that method has worked for me several times, only problem being if the code checks file extensions from the uploaded files... |
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| Posted: Thu Oct 09, 2008 4:46 pm |
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| Cablekid |
| Advanced user |
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| Joined: Jul 14, 2007 |
| Posts: 85 |
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How dose 1 do that?
Here is the entire source.
Config.inc.php
| Code: | <?php
*
* Path to a directory which holds the images.
*/
$imagebasedir = '../../uploads';
/*
* An absolute or relative URL to the image folder.
* This url is used to generate the source of the image.
*/
$imagebaseurl = 'uploads';
/*
* Allow your users to browse the subdir of the defined basedir.
*/
$browsedirs = true;
/*
* If enabled users will be able to upload
* files to any viewable directory. You should really only enable
* this if the area this script is in is already password protected.
*/
$allowuploads = true;
/*
* If a user uploads a file with the same
* name as an existing file do you want the existing file
* to be overwritten?
*/
$overwrite = false;
/*
* Define the extentions you want to show within the
* directory listing. The extensions also limit the
* files the user can upload to your image folders.
*/
$supportedextentions = array(
'gif',
'png',
'jpeg',
'jpg',
'bmp'
);
/*
* If you want to add your own special file icons use
* this section below. Each entry relates to the extension of the
* given file, in the form <extension> => <filename>.
* These files must be located within the dlf directory.
*/
$filetypes = array (
'png' => 'jpg.gif',
'jpeg' => 'jpg.gif',
'bmp' => 'jpg.gif',
'jpg' => 'jpg.gif',
'gif' => 'gif.gif',
'psd' => 'psd.gif',
);
?>
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insert_image.php
| Code: | <?php
require('config.inc.php');
error_reporting(0);
// get the identifier of the editor
$wysiwyg = $_GET['wysiwyg'];
// set image dir
$leadon = $rootdir.$imagebasedir;
if($leadon=='.') $leadon = '';
if((substr($leadon, -1, 1)!='/') && $leadon!='') $leadon = $leadon . '/';
$startdir = $leadon;
// validate the directory
$_GET['dir'] = $_POST['dir'] ? $_POST['dir'] : $_GET['dir'];
if($_GET['dir']) {
if(substr($_GET['dir'], -1, 1)!='/') {
$_GET['dir'] = $_GET['dir'] . '/';
}
$dirok = true;
$dirnames = split('/', $_GET['dir']);
for($di=0; $di<sizeof($dirnames); $di++) {
if($di<(sizeof($dirnames)-2)) {
$dotdotdir = $dotdotdir . $dirnames[$di] . '/';
}
}
if(substr($_GET['dir'], 0, 1)=='/') {
$dirok = false;
}
if($_GET['dir'] == $leadon) {
$dirok = false;
}
if($dirok) {
$leadon = $_GET['dir'];
}
}
// upload file
if($allowuploads && $_FILES['file']) {
$upload = true;
if(!$overwrite) {
if(file_exists($leadon.$_FILES['file']['name'])) {
$upload = false;
}
}
$ext = strtolower(substr($_FILES['file']['name'], strrpos($_FILES['file']['name'], '.')+1));
if(!in_array($ext, $supportedextentions)) {
$upload = false;
}
if($upload) {
move_uploaded_file($_FILES['file']['tmp_name'], $leadon . $_FILES['file']['name']);
}
}
if($allowuploads) {
$phpallowuploads = (bool) ini_get('file_uploads');
$phpmaxsize = ini_get('upload_max_filesize');
$phpmaxsize = trim($phpmaxsize);
$last = strtolower($phpmaxsize{strlen($phpmaxsize)-1});
switch($last) {
case 'g':
$phpmaxsize *= 1024;
case 'm':
$phpmaxsize *= 1024;
}
}
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
</head>
<table width="200" border="0" cellpadding="0" cellspacing="0" style="background-color: #F7F7F7; border: 2px solid #FFFFFF; padding: 5px;">
<tr>
<td style="width: 115px;padding-bottom: 2px; padding-top: 0px; font-family: arial, verdana, helvetica; font-size: 11px;" width="100">Alignment:</td>
<td style="width: 85px;padding-bottom: 2px; padding-top: 0px;">
<select name="align" id="align" style="font-family: arial, verdana, helvetica; font-size: 11px; width: 100%;">
<option value="">Not Set</option>
<option value="left">Left</option>
<option value="right">Right</option>
<option value="texttop">Texttop</option>
<option value="absmiddle">Absmiddle</option>
<option value="baseline">Baseline</option>
<option value="absbottom">Absbottom</option>
<option value="bottom">Bottom</option>
<option value="middle">Middle</option>
<option value="top">Top</option>
</select>
</td>
</tr>
<tr>
<td style="padding-bottom: 2px; padding-top: 0px; font-family: arial, verdana, helvetica; font-size: 11px;">Horizontal Space:</td>
<td style="padding-bottom: 2px; padding-top: 0px;"><input type="text" name="hspace" id="hspace" value="" style="font-size: 10px; width: 100%;"></td>
</tr>
<tr>
<td style="padding-bottom: 2px; padding-top: 0px; font-family: arial, verdana, helvetica; font-size: 11px;">Vertical Space:</td>
<td style="padding-bottom: 2px; padding-top: 0px;"><input type="text" name="vspace" id="vspace" value="" style="font-size: 10px; width: 100%;"></td>
</tr>
</table>
</td>
</tr>
</table>
</td>
<td style="vertical-align: top;width: 150px; padding-left: 5px;">
<span style="font-family: arial, verdana, helvetica; font-size: 11px; font-weight: bold;">Select Image:</span>
<iframe id="chooser" frameborder="0" style="height:165px;width: 180px;border: 2px solid #FFFFFF; padding: 5px;" src="select_image.php?dir=<?php echo $leadon; ?>"></iframe>
</td>
</tr>
<tr>
<td colspan="2" align="right" style="padding-top: 5px;">
<input type="submit" value=" Submit " onclick="insertImage();return false;" style="font-size: 12px;">
<?php if ( $allowuploads ) { ?>
<input type="submit" value=" Upload " style="font-size: 12px;">
<?php } ?>
<input type="button" value=" Cancel " onclick="window.close();" style="font-size: 12px;">
</td>
</tr>
</form>
</table>
</body>
</html> |
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| Posted: Thu Oct 09, 2008 6:08 pm |
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| pexli |
| Valuable expert |
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| Joined: May 24, 2007 |
| Posts: 665 |
| Location: Bulgaria |
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| Posted: Thu Oct 09, 2008 6:49 pm |
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| Cablekid |
| Advanced user |
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| Joined: Jul 14, 2007 |
| Posts: 85 |
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YES U ROCK I DID MY VERY FIRST EXPLOIT! AWSOME! MY OWN!
SWEET! |
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| Posted: Thu Oct 09, 2008 7:32 pm |
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| pexli |
| Valuable expert |
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| Joined: May 24, 2007 |
| Posts: 665 |
| Location: Bulgaria |
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| Posted: Thu Oct 09, 2008 8:25 pm |
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| Cablekid |
| Advanced user |
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| Joined: Jul 14, 2007 |
| Posts: 85 |
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How dose one go about submitting this to milw0rm.
do you send an email. |
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| Posted: Fri Oct 10, 2008 6:34 am |
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| pexli |
| Valuable expert |
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| Joined: May 24, 2007 |
| Posts: 665 |
| Location: Bulgaria |
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| before you submit something on milw0rm you need to investigate why this hole working here but not working there.Google help's you. |
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| Posted: Fri Oct 10, 2008 5:13 pm |
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| Cablekid |
| Advanced user |
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| Joined: Jul 14, 2007 |
| Posts: 85 |
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Alright,
Question for ya..
When i upload the shell on some sites, it says
| Code: | Forbidden
You don't have permission to access /graph/tmp/home1.php.jpg on this server. |
When i go to it, Is that because the server doesn't chmod it to be readable.
If so any other way you can upload shells? |
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| Posted: Fri Oct 10, 2008 5:18 pm |
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| pexli |
| Valuable expert |
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| Joined: May 24, 2007 |
| Posts: 665 |
| Location: Bulgaria |
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| Cablekid wrote: | Alright,
Question for ya..
When i upload the shell on some sites, it says
| Code: | Forbidden
You don't have permission to access /graph/tmp/home1.php.jpg on this server. |
When i go to it, Is that because the server doesn't chmod it to be readable.
If so any other way you can upload shells? |
Yep.This depend of server settings.If you try like this
/graph/tmp/home1.php |
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| Posted: Fri Oct 10, 2008 6:42 pm |
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| Cablekid |
| Advanced user |
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| Joined: Jul 14, 2007 |
| Posts: 85 |
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Ya i tried like this
/graph/tmp/home1.php
and like this /graph/tmp/home1.php.jpg
same thing, so its not possible to upload php to this site? |
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| Posted: Fri Oct 10, 2008 9:08 pm |
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| pexli |
| Valuable expert |
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| Joined: May 24, 2007 |
| Posts: 665 |
| Location: Bulgaria |
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Try to upload .htaccess with
AddType application/x-httpd-php .php
try .htaccess%00 |
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| Posted: Fri Oct 10, 2008 10:51 pm |
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| Cablekid |
| Advanced user |
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| Joined: Jul 14, 2007 |
| Posts: 85 |
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| Smart idea, i tried it still didn't work. |
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