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74 lines
6.4 KiB
Markdown
74 lines
6.4 KiB
Markdown
# Chrome Cache to XSS
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<details>
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<summary><a href="https://cloud.hacktricks.xyz/pentesting-cloud/pentesting-cloud-methodology"><strong>☁️ HackTricks Cloud ☁️</strong></a> -<a href="https://twitter.com/hacktricks_live"><strong>🐦 Twitter 🐦</strong></a> - <a href="https://www.twitch.tv/hacktricks_live/schedule"><strong>🎙️ Twitch 🎙️</strong></a> - <a href="https://www.youtube.com/@hacktricks_LIVE"><strong>🎥 Youtube 🎥</strong></a></summary>
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* **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/hacktricks_live)**.**
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* **Share your hacking tricks by submitting PRs to the** [**hacktricks repo**](https://github.com/carlospolop/hacktricks) **and** [**hacktricks-cloud repo**](https://github.com/carlospolop/hacktricks-cloud).
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</details>
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Technique taken [**from this writeup**](https://blog.arkark.dev/2022/11/18/seccon-en/#web-spanote)**.**
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There are two important types of cache:
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* **back/forward cache (bfcache)**
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* ref. [https://web.dev/i18n/en/bfcache/](https://web.dev/i18n/en/bfcache/)
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* It stores a complete snapshot of a page **including the JavaScript heap**.
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* The cache is used for back/forward navigations.
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* it has preference over disk cache
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* **disk cache**
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* ref. [https://www.chromium.org/developers/design-documents/network-stack/disk-cache/](https://www.chromium.org/developers/design-documents/network-stack/disk-cache/)
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* It stores a resource fetched from the web. The cache **doesn't include the JavaScript heap**.
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* The cache is also used for back/forward navigations to skip communication costs.
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As a interesting point of disk cache, the **cache includes** not only the HTTP response rendered to a web page, but also **those fetched with `fetch`**. In other words, if you a**ccess the URL for a fetched** resource, the **browser will render the resource** on the page.
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There is another important point. If both disk cache and bfcache are valid for an accessed page at back/forward navigations, the **bfcache has priority over the disk cache**. So, if you need to access a page stored in both caches but you want to use the one from the disk, you need to somehow **disable bfcache.**
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### Disable bfcache
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bfcache is disabled by [default options](https://github.com/puppeteer/puppeteer/blob/v19.2.0/packages/puppeteer-core/src/node/ChromeLauncher.ts#L175) of puppeteer.
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Let's try the interesting behavior in this challenge.
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Firstly, you have to disable bfcache[\[2\]](https://blog.arkark.dev/2022/11/18/seccon-en/#fn2). There are many conditions where bfcache is disabled, the list is:
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* [https://source.chromium.org/chromium/chromium/src/+/main:out/mac-Debug/gen/third\_party/blink/renderer/core/inspector/protocol/page.cc?q=BackForwardCacheNotRestoredReasonEnum \&ss=chromium](https://source.chromium.org/chromium/chromium/src/+/main:out/mac-Debug/gen/third\_party/blink/renderer/core/inspector/protocol/page.cc?q=BackForwardCacheNotRestoredReasonEnum%20\&ss=chromium)
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The easy way is to use `RelatedActiveContentsExist`.
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* `RelatedActiveContentsExist`: The page opend with `window.open()` and it has a reference of `window.opener`.
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* ref. [https://web.dev/i18n/en/bfcache/#avoid-windowopener-references](https://web.dev/i18n/en/bfcache/#avoid-windowopener-references)
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Therefore, the following procedure reproduces the behavior:
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1. Access a web page (E.g. `https://example.com`)
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2. Execute `open("http://spanote.seccon.games:3000/api/token")`
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* 
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* The server returns a response with 500 status code.
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3. In the opend tab, access `http://spanote.seccon.games:3000/`
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* 
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* Then, the response of `http://spanote.seccon.games:3000/api/token` is cached as a disk cache.
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4. Execute `history.back()`
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* 
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* The cached JSON response is rendered on the page!
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You can confirm that disk cache is used using DevTools in Google Chrome:\
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<details>
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<summary><a href="https://cloud.hacktricks.xyz/pentesting-cloud/pentesting-cloud-methodology"><strong>☁️ HackTricks Cloud ☁️</strong></a> -<a href="https://twitter.com/hacktricks_live"><strong>🐦 Twitter 🐦</strong></a> - <a href="https://www.twitch.tv/hacktricks_live/schedule"><strong>🎙️ Twitch 🎙️</strong></a> - <a href="https://www.youtube.com/@hacktricks_LIVE"><strong>🎥 Youtube 🎥</strong></a></summary>
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* Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access to the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
|
|
* 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/hacktricks_live)**.**
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* **Share your hacking tricks by submitting PRs to the** [**hacktricks repo**](https://github.com/carlospolop/hacktricks) **and** [**hacktricks-cloud repo**](https://github.com/carlospolop/hacktricks-cloud).
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</details>
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