CVE-2021-41090 – github.com/grafana/agent

Package

Manager: go
Name: github.com/grafana/agent
Vulnerable Version: >=0.14.0 <0.21.2

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

EPSS: 0.00742 pctl0.72097

Details

Instance config inline secret exposure in Grafana ### Impact Some inline secrets are exposed in plaintext over the Grafana Agent HTTP server: * Inline secrets for metrics instance configs in the base YAML file are exposed at `/-/config` * Inline secrets for integrations are exposed at `/-/config` * Inline secrets for Consul ACL tokens and ETCD basic auth when configured for the scraping service at `/-/config`. * Inline secrets for the Kafka receiver for OpenTelemetry-Collector tracing at `/-/config`. * Inline secrets for metrics instance configs loaded from the scraping service are exposed at `/agent/api/v1/configs/{name}`. Inline secrets will be exposed to anyone being able to reach these endpoints. Secrets found in these sections are used for: * Delivering metrics to a Prometheus Remote Write system * Authenticating against a system for discovering Prometheus targets * Authenticating against a system for collecting metrics (scrape_configs and integrations) * Authenticating against a Consul or ETCD for storing configurations to distribute in scraping service mode * Authenticating against Kafka for receiving traces Non-inlined secrets, such as `*_file`-based secrets, are not impacted by this vulnerability. ### Patches Download [v0.20.1](https://github.com/grafana/agent/releases/tag/v0.20.1) or any version past [v0.21.2](https://github.com/grafana/agent/releases/tag/v0.21.2) to patch Grafana Agent. These patches obfuscate the listed impacted secrets from the vulnerable endpoints. The patches also disable the endpoints by default. Pass the command-line flag `--config.enable-read-api` to opt-in and re-enable the endpoints. ### Workarounds If for some reason you cannot upgrade, use non-inline secrets where possible. Not all configuration options may have a non-inline equivalent. You also may desire to restrict API access to Grafana Agent, with some combination of: * Restrict network interfaces Grafana Agent listens on through `http_listen_address` in the `server` block. `127.0.0.1` is the most restrictive, `0.0.0.0` is the default. * Configure Grafana Agent to use HTTPS with client authentication. * Use firewall rules to restrict external access to Grafana Agent's API.

Metadata

Created: 2021-12-08T19:52:40Z
Modified: 2021-12-14T15:32:21Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/12/GHSA-9c4x-5hgq-q3wh/GHSA-9c4x-5hgq-q3wh.json
CWE IDs: ["CWE-200", "CWE-312"]
Alternative ID: GHSA-9c4x-5hgq-q3wh
Finding: F308
Auto approve: 1