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Leakage of excessive information into log in next-auth

Low
balazsorban44 published GHSA-p6mm-27gq-9v3p Jul 26, 2022

Package

npm next-auth (npm)

Affected versions

<4.10.2, <3.29.9

Patched versions

4.10.2, 3.29.9

Description

Impact

An information disclosure vulnerability in next-auth before v4.10.2 and v3.29.9 allows an attacker with log access privilege to obtain excessive information such as an identity provider's secret in the log (which is thrown during OAuth error handling) and use it to leverage further attacks on the system, like impersonating the client to ask for extensive permissions.

Patches

We patched this vulnerability in v4.10.2 and v3.29.9 by moving the log for provider information to the debug level. In addition, we added a warning for having the debug: true option turned on in production and documented it here.

You have enabled the debug option. It is meant for development only, to help you catch issues in your authentication flow and you should consider removing this option when deploying to production. One way of only allowing debugging while not in production is to set debug: process.env.NODE_ENV !== "production", so you can commit this without needing to change the value.

If you want to log debug messages during production anyway, we recommend setting the logger option with proper sanitization of potentially sensitive user information.

To upgrade:

npm i next-auth@latest
# or
yarn add next-auth@latest
# or
pnpm add next-auth@latest

(This will update to the latest v4 version, but you can change latest to 3 if you want to stay on v3. This is not recommended. v3 is unmaintained.)

Workarounds

If for some reason you cannot upgrade, you can user the logger configuration option by sanitizing the logs:

// Example
import log from "your-logging-service"
export const authOptions: NextAuthOptions = {
  debug: process.env.NODE_ENV !== "production",
  logger: {
    error: (code, metadata) => {
      if (!(metadata instanceof Error) &&  metadata.provider) {
        // redact the provider secret here
        delete metadata.provider
        log.error(code, metadata)
      } else {
        log.error(code, metadata)
      }
    }
  },
}

References

Related documentation:

For more information

If you have any concerns, we request responsible disclosure, outlined here: https://next-auth.js.org/security#reporting-a-vulnerability

Timeline

The issue was reported 18th of July, a response was sent out in less than 20 minutes and after identifying the issue a patch was published within a week.

Severity

Low

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVE ID

CVE-2022-31186

Weaknesses

Credits