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CVE-2021-41090

Information Disclosure in github.com/grafana/agent (CVE-2021-41090)

Summary

Vulnerability in github.com/grafana/agent (CVE-2021-41090). Risk of unauthorized operations or information disclosure. Exploitable via http_listen_address. Mitigation: upgrade to 0.21.2 or later.

Original description

The description as published by the source.

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 or any version past v0.21.2 to patch Grafana Agent. These patches obfuscate the listed impacted secrets from the vulnerable endpoints.

The patches also disable the endp…

Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2021-41090 has been found in github.com/grafana/agent.
Attackers can target a specific entry point like http_listen_address over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade github.com/grafana/agent to 0.21.2 or later.
If unsure, ask your IT team or search "github.com/grafana/agent CVE-2021-41090" on the vendor's site.

CVE-2021-41090 (github.com/grafana/agent) — CWE-200
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: http_listen_address / server
Patched: 0.21.2 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

Information disclosure (CWE-200) exists in github.com/grafana/agent. Attackers reach the vulnerable code path via http_listen_address without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of github.com/grafana/agent. Attack surface: http_listen_address / server.

🔥 Severity

Severity: ?. Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 0.21.2.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'github.com/grafana/agent' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'github.com/grafana/agent' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で github.com/grafana/agent を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade github.com/grafana/agent to 0.21.2

    ステージング環境で 0.21.2 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

Go github.com/grafana/agent
[{"type":"SEMVER","events":[{"introduced":"0.14.0"},{"fixed":"0.21.2"}]}]

References

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