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26 changes: 15 additions & 11 deletions src/content/docs/guides/policy-diff.md
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Expand Up @@ -70,16 +70,20 @@ A more advanced review would be to apply [Principle of Least Authority][PoLA] an

Examples of powerful APIs - not an exhaustive list:

| global | builtin | description |
| ----------------------------------------------------- | ------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------- |
| | `child_process` and any form of `exec` or `spawn` | Allows running arbitrary commands on the host machine and is not covered |
| | `fs` | Allows reading and writing files on the host machine |
| `fetch`, `XMLHttpRequest`, `WebSocket`, `EventSource` | `http`, `https`, `net` | Allows making network requests |
| `document` | | contains a lot of powerful APIs that can be used to manipulate the DOM, including creating iframes with unprotected globals |
| `open` | | `window.open` allows opening new windows/tabs and accessing clean globals there |
| `navigator` | | contains a lot of powerful APIs that can be used to fingerprint the user or control the browser |
| `chrome` or `browser` | | extension APIs - should only be accessed by a package that is a helper library for cross-browser extensions |
| `process` | | Allows reading and writing environment variables and other process-related operations |
| | `vm` | Allows running arbitrary code in a new context |
| global | builtin | description |
| ----------------------------------------------------- | ------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------- |
| | `child_process` and any form of `exec` or `spawn` | Allows running arbitrary commands on the host machine and is not covered |
| | `fs` | Allows reading and writing files on the host machine |
| `fetch`, `XMLHttpRequest`, `WebSocket`, `EventSource` | `http`, `https`, `net` | Allows making network requests |
| `document` | | contains a lot of powerful APIs that can be used to manipulate the DOM, including creating iframes with unprotected globals |
| `open` | | `window.open` allows opening new windows/tabs and accessing clean globals there |
| `navigator` | | contains a lot of powerful APIs that can be used to fingerprint the user or control the browser |
| `chrome` or `browser` | | extension APIs - should only be accessed by a package that is a helper library for cross-browser extensions |
| `process` | | Allows reading and writing environment variables and other process-related operations |
| | `vm` | Allows running arbitrary code in a new context |
| `document.querySelector`, `document.createElement`, etc| | Grants access to powerful context related objects such as `document` and `window` (aka globalThis) via properties such as `ownerDocument` or `defaultView` which are exposed by DOM nodes (which are the type of return values of such APIs) |
| `Document.prototype`, `Node.prototype`, etc | | Redefining methods of these prototypes may allow attackers to hijack these at runtime when are being used by innocent code elsewhere |
| `addEventListener` | | Events leak powerful objects such as DOM nodes, `document` and `window` - such API may grant attackers access to such events. Also, listening to the `message` event specifically may allow attackers to intercept sensitive messages being sent across the app |
| `location` | | A powerful API that may allow attackers change the location of the app which may result in phishing attempts |

[PoLA]: https://en.wikipedia.org/wiki/Principle_of_least_privilege
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