Vulnerability · Published Nov 20, 2023 · Assigned by GitHub_M
CVE-2023-48309next-auth vulnerable to possible user mocking that bypasses basic authentication
Medium 5.3
In plain English
A medium-severity incorrect authorization in next-auth from nextauthjs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
NextAuth.js provides authentication for Next.js. `next-auth` applications prior to version 4.24.5 that rely on the default Middleware authorization are affected by a vulnerability. A bad actor could create an empty/mock user, by getting hold of a NextAuth.js-issued JWT from an interrupted OAuth sign-in flow (state, PKCE or nonce). Manually overriding the `next-auth.session-token` cookie value with this non-related JWT would let the user simulate a logged in user, albeit having no user information associated with it. (The only property on this user is an opaque randomly generated string). This vulnerability does not give access to other users' data, neither to resources that require proper authorization via scopes or other means. The created mock user has no information associated with it (ie. no name, email, access_token, etc.) This vulnerability can be exploited by bad actors to peek at logged in user states (e.g. dashboard layout). `next-auth` `v4.24.5` contains a patch for the vulnerability. As a workaround, using a custom authorization callback for Middleware, developers can manually do a basic authentication.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | next-auth | 4.24.5 | GHSA-v64w-49xw-qq89 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| nextauthjs | next-auth | < 4.24.5 |
Weakness: CWE-285, CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
References
- https://github.com/nextauthjs/next-auth/security/advisories/GHSA-v64w-49xw-qq89 x_refsource_CONFIRM
- https://github.com/nextauthjs/next-auth/commit/d237059b6d0cb868c041ba18b698e0cee20a2f10 x_refsource_MISC
- https://authjs.dev/guides/basics/role-based-access-control x_refsource_MISC
- https://next-auth.js.org/configuration/nextjs#advanced-usage x_refsource_MISC
- https://next-auth.js.org/configuration/nextjs#middlewar x_refsource_MISC