Vulnerability · Published Aug 2, 2022 · Assigned by GitHub_M
CVE-2022-35924Verification requests (magic link) sent to unwanted emails
Critical 9.1
In plain English
A critical-severity improper input validation 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 1.5% (higher than 74% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
NextAuth.js is a complete open source authentication solution for Next.js applications. `next-auth` users who are using the `EmailProvider` either in versions before `4.10.3` or `3.29.10` are affected. If an attacker could forge a request that sent a comma-separated list of emails (eg.: `attacker@attacker.com,victim@victim.com`) to the sign-in endpoint, NextAuth.js would send emails to both the attacker and the victim's e-mail addresses. The attacker could then login as a newly created user with the email being `attacker@attacker.com,victim@victim.com`. This means that basic authorization like `email.endsWith("@victim.com")` in the `signIn` callback would fail to communicate a threat to the developer and would let the attacker bypass authorization, even with an `@attacker.com` address. This vulnerability has been patched in `v4.10.3` and `v3.29.10` by normalizing the email value that is sent to the sign-in endpoint before accessing it anywhere else. We also added a `normalizeIdentifier` callback on the `EmailProvider` configuration, where you can further tweak your requirements for what your system considers a valid e-mail address. (E.g.: strict RFC2821 compliance). Users are advised to upgrade. There are no known workarounds for this vulnerability. If for some reason you cannot upgrade, you can normalize the incoming request using Advanced Initialization.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | next-auth | 4.10.3 | GHSA-xv97-c62v-4587 |
| npm | next-auth | 3.29.10 | GHSA-xv97-c62v-4587 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| nextauthjs | next-auth | >= 4.0.0, < 4.10.3< 3.29.10 |
Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
References
- https://next-auth.js.org/configuration/initialization#advanced-initialization x_refsource_MISC
- https://github.com/nextauthjs/next-auth/security/advisories/GHSA-xv97-c62v-4587 x_refsource_CONFIRM
- https://github.com/nextauthjs/next-auth/commit/afb1fcdae3cc30445038ef588e491d139b916003 x_refsource_MISC
- https://en.wikipedia.org/wiki/Email_address#Local-part x_refsource_MISC
- https://next-auth.js.org/configuration/callbacks#sign-in-callback x_refsource_MISC
- https://next-auth.js.org/providers/email x_refsource_MISC
- https://next-auth.js.org/providers/email#normalizing-the-e-mail-address x_refsource_MISC
- https://nodemailer.com/message/addresses x_refsource_MISC