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CVE-2021-4287
Vulnerability in binwalk (CVE-2021-4287)
Summary
vulnerability in binwalk (CVE-2021-4287). Confidential information can be exposed externally. Mitigation: upgrade to `2.3.3` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2021-4287** has been found in binwalk.
Confidential information can be exposed externally. CVSS score: ?/10.
What to do: upgrade binwalk to **2.3.3** or later.
If unsure, ask your IT team or search "binwalk CVE-2021-4287" on the vendor's site.
CVE-2021-4287 (binwalk) — CWE-59 /
Attack vector: remote (network-reachable) / unauthenticated
Patched: `2.3.3` — 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-59) exists in binwalk.
📍 Affected scope
binwalk — .
🔥 Severity
Severity: ?. Confidential information can be exposed externally
🔧 How to fix
Update to **2.3.3**.
🛡️ 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 'binwalk' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'binwalk' . | 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 `binwalk` を grep し、稼働しているサービス・バージョンを把握する。
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6Apply patch patch
Upgrade binwalk to 2.3.3ステージング環境で 2.3.3 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と、Step 3 で見つけた異常検知の続報チェックを含めること。
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7Post-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 Step 3 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
PyPI
binwalk
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.3"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2021-4287
- advisory https://github.com/ReFirmLabs/binwalk/releases/tag/v2.3.3
- advisory https://vuldb.com/?ctiid.216876
- advisory https://vuldb.com/?id.216876
- advisory https://github.com/advisories/GHSA-8m3f-g62j-3vx8
- package https://github.com/ReFirmLabs/binwalk
- package https://pypi.org/project/binwalk
- patch https://github.com/ReFirmLabs/binwalk/pull/556
- patch https://github.com/ReFirmLabs/binwalk/commit/fa0c0bd59b8588814756942fe4cb5452e76c1dcd