Vulnerability in ruby-webrick (DEBIAN-CVE-2024-47220)

Summary

vulnerability in ruby-webrick (DEBIAN-CVE-2024-47220). Risk of unauthorized operations or information disclosure. Exploitable via `GET /admin`. Mitigation: upgrade to `1.9.1-1` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **DEBIAN-CVE-2024-47220** has been found in ruby-webrick. Attackers can target a specific entry point like `GET /admin` over the network to misuse the product. Risk of unauthorized operations or information disclosure. CVSS score: ?/10. What to do: upgrade ruby-webrick to **1.9.1-1** or later. If unsure, ask your IT team or search "ruby-webrick DEBIAN-CVE-2024-47220" on the vendor's site.

DEBIAN-CVE-2024-47220 (ruby-webrick) — Attack surface: GET /admin / POST /user Patched: `1.9.1-1` — 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** (unclassified) exists in ruby-webrick. Attackers reach the vulnerable code path via `GET /admin` without authentication.

📍 Affected scope

ruby-webrick — . Attack surface: GET /admin / POST /user.

🔥 Severity

Severity: ?. Risk of unauthorized operations or information disclosure

🔧 How to fix

Update to **1.9.1-1**.

🛡️ 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 `GET /admin` requests with malformed payloads or SQL meta-characters. Run `grep -r 'ruby-webrick' .` 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

1
Identify exposure identify
```
grep -r 'ruby-webrick' . | 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 `ruby-webrick` を grep し、稼働しているサービス・バージョンを把握する。
3
Hunt for indicators of compromise detect
```
grep 'GET /admin' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'
```
アクセスログで `GET /admin` への異常なリクエスト (不正な認証ヘッダ・SQLメタ文字)を過去 30〜90日分捜索。WAF/SIEM があれば該当パスのアラート発火履歴を確認。
6
Apply patch patch
```
Upgrade ruby-webrick to 1.9.1-1
```
ステージング環境で 1.9.1-1 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。
7
Post-deployment verification verify
```
Replay attack against GET /admin on staging to confirm patch closes the vector
```
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

Debian:12 ruby-webrick

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:13 ruby-webrick

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.1-1"}]}]

Debian:14 ruby-webrick