chore(deps): update dependency @sveltejs/kit to v1.15.2 [security] - autoclosed #1185

renovate · 2023-04-05T02:03:15Z

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@sveltejs/kit (source)	`1.5.0` -> `1.15.2`

GitHub Vulnerability Alerts

CVE-2023-29003

Summary

The SvelteKit framework offers developers an option to create simple REST APIs. This is done by defining a +server.js file, containing endpoint handlers for different HTTP methods.

SvelteKit provides out-of-the-box cross-site request forgery (CSRF) protection to it’s users. The protection is implemented at kit/src/runtime/server/respond.js#L52. While the implementation does a sufficient job in mitigating common CSRF attacks, the protection can be bypassed by simply specifying a different Content-Type header value.

Details

The CSRF protection is implemented using the code shown below.

const forbidden =
  // (1)
  request.method === 'POST' &&
  // (2)
  request.headers.get('origin') !== url.origin &&
  // (3)
  is_form_content_type(request);

if (forbidden) {
  // (4)
  const csrf_error = error(403, `Cross-site ${request.method} form submissions are forbidden`);
  if (request.headers.get('accept') === 'application/json') {
    return json(csrf_error.body, { status: csrf_error.status });
  }
  return text(csrf_error.body.message, { status: csrf_error.status });
}

If the incoming request specifies a POST method (1), the protection will compare the server’s origin with the value of the HTTP Origin header (2). A mismatch between these values signals that a potential attack has been detected. The final check is performed on the request’s Content-Type header (3) whether the value is either application/x-www-form-urlencoded or multipart/form-data (kit/src/utils/http.js#L71). If all the previous checks pass, the request will be rejected with an 403 error response (4).

The is_form_content_type validation is not sufficient to mitigate all possible variations of this type of attack. If a CSRF attack is performed with the Content-Type header set to text/plain, the protection will be circumvented and the request will be processed by the endpoint handler.

Impact

If abused, this issue will allow malicious requests to be submitted from third-party domains, which can allow execution of operations within the context of the victim's session, and in extreme scenarios can lead to unauthorized access to users’ accounts.

Remediation

SvelteKit 1.15.1 updates the is_form_content_type function call in the CSRF protection logic to include text/plain.

As additional hardening of the CSRF protection mechanism against potential method overrides, SvelteKit 1.15.1 is now performing validation on PUT, PATCH and DELETE methods as well. This latter hardening is only needed to protect users who have put in some sort of ?_method= override feature themselves in their handle hook, so that the request that resolve sees could be PUT/PATCH/DELETE when the browser issues a POST request.

CVE-2023-29008

Summary

The SvelteKit framework offers developers an option to create simple REST APIs. This is done by defining a +server.js file, containing endpoint handlers for different HTTP methods.

SvelteKit provides out-of-the-box cross-site request forgery (CSRF) protection to its users. The protection is implemented at kit/src/runtime/server/respond.js. While the implementation does a sufficient job of mitigating common CSRF attacks, the protection can be bypassed by simply specifying an upper-cased Content-Type header value. The browser will not send uppercase characters on form submission, but this check does not block all expected cross-site requests: https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#simple_requests

Details

The CSRF protection is implemented using the code shown below.

		const forbidden =
			is_form_content_type(request) &&
			(request.method === 'POST' ||
				request.method === 'PUT' ||
				request.method === 'PATCH' ||
				request.method === 'DELETE') &&
			request.headers.get('origin') !== url.origin;

		if (forbidden) {
			const csrf_error = error(403, `Cross-site ${request.method} form submissions are forbidden`);
			if (request.headers.get('accept') === 'application/json') {
				return json(csrf_error.body, { status: csrf_error.status });
			}
			return text(csrf_error.body.message, { status: csrf_error.status });
		}

If the incoming request specifies a POST/PUT/PATCH/DELETE method, the protection will compare the server’s origin with the value of the HTTP Origin header. A mismatch between these values signals that a potential attack has been detected. The final check is performed on the request’s Content-Type header whether the value is either application/x-www-form-urlencoded, multipart/form-data or text/plain. If all the previous checks pass, the request will be rejected with an 403 error response.
However, is_form_content_type, which is responsible for checking the value of the Content-Type header, is not sufficient to mitigate all possible variations of this type of attack. Since this function is checking Content-Type with lower-cased values, and the browser accepts upper-cased Content-Type header to be sent, a CSRF attack performed with the Content-Type header that contains an upper-cased character (e.g., text/plaiN) can circumvent the protection and the request will be processed by the endpoint handler.

Impact

If abused, this issue will allow malicious requests to be submitted from third-party domains, which can allow execution of operations within the context of the victim's session, and in extreme scenarios can lead to unauthorized access to users’ accounts. This may lead to all POST operations requiring authentication being allowed in the following cases:

If the target site sets SameSite=None on its auth cookie and the user visits a malicious site in a Chromium-based browser
If the target site doesn't set the SameSite attribute explicitly and the user visits a malicious site with Firefox/Safari with tracking protections turned off.
If the user is visiting a malicious site with a very outdated browser.

Remediations

It is preferred to update to SvelteKit 1.15.2. It is also recommended to explicitly set SameSite to a value other than None on authentication cookies especially if the upgrade cannot be done in a timely manner.

Release Notes

sveltejs/kit

chore(deps): update dependency @sveltejs/kit to v1.15.2 [security] - autoclosed #1185

chore(deps): update dependency @sveltejs/kit to v1.15.2 [security] - autoclosed #1185

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3 failed tests on run #890 ↗︎

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