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GHSA-2452-6xj8-jh47
No affected components available
Summary
Nuxt allows any websites to send any requests to the development server and read the response due to default CORS settings.
Details
While Vite patched the default CORS settings to fix https://github.com/vitejs/vite/security/advisories/GHSA-vg6x-rcgg-rjx6, nuxt uses its own CORS handler by default (https://github.com/nuxt/nuxt/pull/23995).
https://github.com/nuxt/nuxt/blob/7d345c71462d90187fd09c96c7692f306c90def5/packages/vite/src/client.ts#L257-L263
That CORS handler sets Access-Control-Allow-Origin: *.
[!IMPORTANT]
If on an affected version, it may be possible to opt-out of the default Nuxt CORS handler by configuringvite.server.cors.
PoC
- Start a dev server in any nuxt project using Vite by
nuxt dev. - Send a fetch request to
http://localhost:3000/_nuxt/app.vue(fetch('http://localhost:3000/_nuxt/app.vue')) from a different origin page.
Impact
Users with the default server.cors option using Vite builder may get the source code stolen by malicious websites
Additional Information
/__nuxt_vite_node__/manifest / /__nuxt_vite_node__/module also seems to have Access-Control-Allow-Origin: *, so it maybe also possible to exploit that handler.
https://github.com/nuxt/nuxt/blob/7d345c71462d90187fd09c96c7692f306c90def5/packages/vite/src/vite-node.ts#L39
Although I didn't find a valid module id.
Note that this handler is probably also vulnerable to DNS rebinding attacks as I didn't find any host header checks.
The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker does not need any special privileges or access rights. The attacker needs the user to perform some action, like clicking a link. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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