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56 lines
4.4 KiB
Markdown
56 lines
4.4 KiB
Markdown
# Chrome Cache to XSS
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
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<details>
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<summary>Support HackTricks</summary>
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* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
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* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
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* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
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</details>
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{% endhint %}
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More in depth details [**in this writeup**](https://blog.arkark.dev/2022/11/18/seccon-en/#web-spanote).
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The technique discussed here involves understanding the behavior and interaction of two primary cache types: the **back/forward cache (bfcache)** and the **disk cache**. The bfcache, which stores a complete snapshot of a page including the JavaScript heap, is prioritized over the disk cache for back/forward navigations due to its ability to store a more comprehensive snapshot. The disk cache, in contrast, stores resources fetched from the web without including the JavaScript heap, and is utilized for back/forward navigations to reduce communication costs. An interesting aspect of the disk cache is its inclusion of resources fetched using `fetch`, meaning accessed URL resources will be rendered by the browser from the cache.
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### Key Points:
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- The **bfcache** has precedence over the disk cache in back/forward navigations.
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- To utilize a page stored in disk cache instead of bfcache, the latter must be disabled.
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### Disabling bfcache:
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By default, Puppeteer disables bfcache, aligning with conditions listed in Chromium's documentation. One effective method to disable bfcache is through the use of `RelatedActiveContentsExist`, achieved by opening a page with `window.open()` that retains a reference to `window.opener`.
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### Reproducing the behavior:
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1. Visit a webpage, e.g., `https://example.com`.
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2. Execute `open("http://spanote.seccon.games:3000/api/token")`, which results in a server response with a 500 status code.
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3. In the newly opened tab, navigate to `http://spanote.seccon.games:3000/`. This action caches the response of `http://spanote.seccon.games:3000/api/token` as a disk cache.
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4. Use `history.back()` to navigate back. The action results in the rendering of the cached JSON response on the page.
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Verification that the disk cache was utilized can be confirmed through the use of DevTools in Google Chrome.
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For further details on bfcache and disk cache, references can be found at [web.dev on bfcache](https://web.dev/i18n/en/bfcache/) and [Chromium's design documents on disk cache](https://www.chromium.org/developers/design-documents/network-stack/disk-cache/), respectively.
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
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<details>
|
|
|
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<summary>Support HackTricks</summary>
|
|
|
|
* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
|
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* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
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* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
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</details>
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{% endhint %}
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