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CVE-2021-43816

Vulnerability in github.com/containerd/containerd (CVE-2021-43816)

Summary

Vulnerability in github.com/containerd/containerd (CVE-2021-43816). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 1.5.9 or later.

Original description

The description as published by the source.

containerd is an open source container runtime. On installations using SELinux, such as EL8 (CentOS, RHEL), Fedora, or SUSE MicroOS, with containerd since v1.5.0-beta.0 as the backing container runtime interface (CRI), an unprivileged pod scheduled to the node may bind mount, via hostPath volume, any privileged, regular file on disk for complete read/write access (sans delete). Such is achieved by placing the in-container location of the hostPath volume mount at either /etc/hosts, /etc/hostname, or /etc/resolv.conf. These locations are being relabeled indiscriminately to match the container process-label which effectively elevates permissions for savvy containers that would not normally be able to access privileged host files. This issue has been resolved in version 1.5.9. Users are advised to upgrade as soon as possible.

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-2021-43816 has been found in github.com/containerd/containerd.
Successful exploitation can lead to full system takeover.
What to do: upgrade github.com/containerd/containerd to 1.5.9 or later.
If unsure, ask your IT team or search "github.com/containerd/containerd CVE-2021-43816" on the vendor's site.

CVE-2021-43816 (github.com/containerd/containerd) — CWE-281
Attack vector: remote (network-reachable) / no user interaction
Patched: 1.5.9 — 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

A vulnerability (CWE-281) exists in github.com/containerd/containerd.

📍 Affected scope

Check the vendor advisory for the affected versions of github.com/containerd/containerd.

🔥 Severity

Severity: ?. Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 1.5.9.

🛡️ 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/containerd/containerd' . 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/containerd/containerd' . | 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/containerd/containerd 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/containerd/containerd to 1.5.9

    ステージング環境で 1.5.9 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/containerd/containerd
[{"type":"SEMVER","events":[{"introduced":"1.5.0"},{"fixed":"1.5.9"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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