oidcc is the OpenID Connect client library for Erlang. Denial of Service (DoS) by Atom exhaustion is possible by calling `oidcc_provider_configuration_worker:get_provider_configuration/1` or `oidcc_provider_configuration_worker:get_jwks/1`. This issue has been patched in version(s)`3.1.2` & `3.2.0-beta.3`.

Affected: Hex: oidcc

### Impact

DOS by Atom exhaustion is possible by calling `oidcc_provider_configuration_worker:get_provider_configuration/1` or `oidcc_provider_configuration_worker:get_jwks/1`.

Since the name is usually provided as a static value in the application using `oidcc`, this is unlikely to be exploited.

### Details

Example to illustrate the vulnerability.

```erlang {ok, Claims} = oidcc:retrieve_userinfo( Token, myapp_oidcc_config_provider, <<"client_id">>, <<"client_secret">>, #{} ) ```

The vulnerability is present in `oidcc_provider_configuration_worker:get_ets_table_name/1`. The function `get_ets_table_name` is calling `erlang:list_to_atom/1`.

https://github.com/erlef/oidcc/blob/018dbb53dd752cb1e331637d8e0e6a489ba1fae9/src/oidcc_provider_configuration_worker.erl#L385-L388

There might be a case (Very highly improbable) where the 2nd argument of `oidcc_provider_configuration_worker:get_*/1` is called with a different atom each time which eventually leads to the atom table filling up and the node crashing.

### Patches

Patched in `3.0.2`, `3.1.2` & `3.2.0-beta.3`

### Workarounds

Make sure only valid provider configuration worker names are passed to the functions.

### References

* https://erlef.github.io/security-wg/secure_coding_and_deployment_hardening/atom_exhaustion.html * https://www.cve.org/CVERecord?id=CVE-2024-31209 * https://euvd.enisa.europa.eu/enisa/EUVD-2024-1249 * https://github.com/advisories/GHSA-mj35-2rgf-cv8p