### Impact

A local file inclusion vulnerability exists in Cortex versions v1.13.0, v1.13.1 and v1.14.0, where a malicious actor could remotely read local files as a result of parsing maliciously crafted Alertmanager configurations when submitted to the [Alertmanager Set Configuration API](https://cortexmetrics.io/docs/api/#set-alertmanager-configuration). Only users of the Cortex Alertmanager service using `-experimental.alertmanager.enable-api` or `enable_api: true` are affected.

### Patches
Affected Cortex users are advised to upgrade to v1.13.2 or v1.14.1.

### Workarounds
Patching is ultimately advised. Using out-of-bound validation, Cortex administrators may reject Alertmanager configurations containing the `api_key_file` setting in the `opsgenie_configs` section and `opsgenie_api_key_file` in the `global` section before sending to the [Set Alertmanager Configuration API](https://cortexmetrics.io/docs/api/#set-alertmanager-configuration) as a workaround.

### References
– Fixed Versions:
– https://github.com/cortexproject/cortex/releases/tag/v1.14.1
– https://github.com/cortexproject/cortex/releases/tag/v1.13.2
– https://cortexmetrics.io/docs/api/#set-alertmanager-configuration

### For more information
If you have any questions or comments about this advisory:

* Open an issue in [cortex](https://github.com/cortexproject/cortex/issues/new/choose)
* Email us at [[email protected]](mailto:[email protected]).Read More