GHSA-cq2g-pw6q-hf7j Cortex's Alertmanager can expose local files content via specially crafted config

• Go github.com/cortexproject/cortex: >= 1.14.0, < 1.14.1 → fixed in 1.14.1 • Go github.com/cortexproject/cortex: >= 1.13.0, < 1.13.2 → fixed in 1.13.2

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. Only users of the Cortex Alertmanager service using `-experimental.alertmanager.enable-api` or `enable_api: true` are affected. Specific Go Packages Affected github.com/cortexproject/cortex/pkg/alertmanager Patches Affected Cortex users are advised to upgrade to versions 1.13.2 or 1.14.1. 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 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 • Email us at [email protected].