Vulnerability · Published Dec 8, 2021 · Assigned by GitHub_M
CVE-2021-41090Instance config inline secret exposure
Medium 6.5
In plain English
A medium-severity information exposure in agent from grafana. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 55% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Grafana Agent is a telemetry collector for sending metrics, logs, and trace data to the opinionated Grafana observability stack. Prior to versions 0.20.1 and 0.21.2, inline secrets defined within a metrics instance config are exposed in plaintext over two endpoints: metrics instance configs defined in the base YAML file are exposed at `/-/config` and metrics instance configs defined for the scraping service are exposed at `/agent/api/v1/configs/:key`. Inline secrets will be exposed to anyone being able to reach these endpoints. If HTTPS with client authentication is not configured, these endpoints are accessible to unauthenticated users. Secrets found in these sections are used for delivering metrics to a Prometheus Remote Write system, authenticating against a system for discovering Prometheus targets, and authenticating against a system for collecting metrics. This does not apply for non-inlined secrets, such as `*_file` based secrets. This issue is patched in Grafana Agent versions 0.20.1 and 0.21.2. A few workarounds are available. Users who cannot upgrade should use non-inline secrets where possible. Users may also desire to restrict API access to Grafana Agent with some combination of restricting the network interfaces Grafana Agent listens on through `http_listen_address` in the `server` block, configuring Grafana Agent to use HTTPS with client authentication, and/or using firewall rules to restrict external access to Grafana Agent's API.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/grafana/agent | 0.21.2 | GHSA-9c4x-5hgq-q3wh |
| Go | github.com/grafana/agent | 0.21.2 | GO-2022-0305 |
Affected products (as reported)
Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
References
- https://github.com/grafana/agent/security/advisories/GHSA-9c4x-5hgq-q3wh x_refsource_CONFIRM
- https://github.com/grafana/agent/pull/1152 x_refsource_MISC
- https://github.com/grafana/agent/commit/af7fb01e31fe2d389e5f1c36b399ddc46b412b21 x_refsource_MISC
- https://github.com/grafana/agent/releases/tag/v0.20.1 x_refsource_MISC
- https://github.com/grafana/agent/releases/tag/v0.21.2 x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20211229-0004/ x_refsource_CONFIRM