CVE-2021-41090: Instance config inline secret exposure
First published: Wed Dec 08 2021(Updated: )
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.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Grafana Agent | >=0.14.0<0.20.1 | |
| Grafana Agent | >=0.21.0<0.21.2 |
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Reference Links
- https://github.com/grafana/agent/commit/af7fb01e31fe2d389e5f1c36b399ddc46b412b21
- https://github.com/grafana/agent/pull/1152
- https://github.com/grafana/agent/releases/tag/v0.20.1
- https://github.com/grafana/agent/releases/tag/v0.21.2
- https://github.com/grafana/agent/security/advisories/GHSA-9c4x-5hgq-q3wh
- https://security.netapp.com/advisory/ntap-20211229-0004/
Frequently Asked Questions
What is CVE-2021-41090?
CVE-2021-41090 is a vulnerability in Grafana Agent that exposes inline secrets defined within a metrics instance config in plaintext over two endpoints.
What is the severity of CVE-2021-41090?
CVE-2021-41090 has a severity rating of 7.5 (High).
Which software versions are affected by CVE-2021-41090?
Versions of Grafana Agent between 0.14.0 and 0.20.1, as well as versions between 0.21.0 and 0.21.2, are affected by CVE-2021-41090.
How can I fix CVE-2021-41090?
To fix CVE-2021-41090, update to Grafana Agent version 0.20.1 or 0.21.2 or later.
Where can I find more information about CVE-2021-41090?
You can find more information about CVE-2021-41090 on the following references: [GitHub Commit](https://github.com/grafana/agent/commit/af7fb01e31fe2d389e5f1c36b399ddc46b412b21), [GitHub Pull Request](https://github.com/grafana/agent/pull/1152), [Grafana Agent Releases](https://github.com/grafana/agent/releases/tag/v0.20.1).
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- agent/references
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- collector/mitre-cve
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- vendor/grafana
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- version/grafana agent/0.14.0
- version/grafana agent/0.21.0