CVE-2021-41090: Github.com/grafana/agent Instance Config Inline Secret Exposure Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-9c4x-5hgq-q3wh",
  "modified" : "2021-12-14T15:32:21Z",
  "published" : "2021-12-08T19:52:40Z",
  "aliases" : [ "CVE-2021-41090" ],
  "summary" : "Instance config inline secret exposure in Grafana",
  "details" : "### Impact\nSome inline secrets are exposed in plaintext over the Grafana Agent HTTP server:\n\n* Inline secrets for metrics instance configs in the base YAML file are exposed at `/-/config` \n* Inline secrets for integrations are exposed at `/-/config`\n* Inline secrets for Consul ACL tokens and ETCD basic auth when configured for the scraping service at `/-/config`.\n* Inline secrets for the Kafka receiver for OpenTelemetry-Collector tracing at `/-/config`.\n* Inline secrets for metrics instance configs loaded from the scraping service are exposed at `/agent/api/v1/configs/{name}`.\n\nInline secrets will be exposed to anyone being able to reach these endpoints.\n\nSecrets found in these sections are used for:\n\n* Delivering metrics to a Prometheus Remote Write system \n* Authenticating against a system for discovering Prometheus targets \n* Authenticating against a system for collecting metrics (scrape_configs and integrations)\n* Authenticating against a Consul or ETCD for storing configurations to distribute in scraping service mode \n* Authenticating against Kafka for receiving traces\n\nNon-inlined secrets, such as `*_file`-based secrets, are not impacted by this vulnerability. \n\n### Patches\n\nDownload [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.\n\nThe patches also disable the endpoints by default. Pass the command-line flag `--config.enable-read-api` to opt-in and re-enable the endpoints.  \n \n### Workarounds\nIf for some reason you cannot upgrade, use non-inline secrets where possible. Not all configuration options may have a non-inline equivalent.\n\nYou also may desire to restrict API access to Grafana Agent, with some combination of:\n\n* 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. \n* Configure Grafana Agent to use HTTPS with client authentication. \n* Use firewall rules to restrict external access to Grafana Agent's API.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/grafana/agent"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.14.0"
      }, {
        "fixed" : "0.21.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/grafana/agent/security/advisories/GHSA-9c4x-5hgq-q3wh"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-41090"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/grafana/agent/pull/1152"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/grafana/agent/commit/a5479755e946e5c7cddb793ee9adda8f5692ba11"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/grafana/agent/commit/af7fb01e31fe2d389e5f1c36b399ddc46b412b21"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/grafana/agent"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/grafana/agent/releases/tag/v0.20.1"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/grafana/agent/releases/tag/v0.21.2"
  }, {
    "type" : "WEB",
    "url" : "https://security.netapp.com/advisory/ntap-20211229-0004"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200", "CWE-312" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-12-08T19:32:31Z",
    "nvd_published_at" : "2021-12-08T17:15:00Z"
  }
}