next-auth before v4.10.2 and v3.29.9 leaks excessive information into log
Discription

### 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](https://next-auth.js.org/warnings#debug_enabled).
> 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](https://next-auth.js.org/configuration/options#logger) with proper sanitization of potentially sensitive user information.

To upgrade:

“`sh
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:
“`ts
// 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:
https://next-auth.js.org/warnings#debug_enabled
https://next-auth.js.org/configuration/options#logger
https://next-auth.js.org/getting-started/upgrade-v4

### 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.Read More

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