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CVE-2024-27306

Cross-Site Scripting (XSS) in aiohttp (CVE-2024-27306)

Summary

cross-site scripting in aiohttp (CVE-2024-27306). Risk of unauthorized operations or information disclosure. Exploitable via ``show_index``. Mitigation: upgrade to `3.9.4` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2024-27306** has been found in aiohttp. Attackers can target a specific entry point like ``show_index`` over the network to misuse the product. Risk of unauthorized operations or information disclosure. CVSS score: ?/10. What to do: upgrade aiohttp to **3.9.4** or later. If unsure, ask your IT team or search "aiohttp CVE-2024-27306" on the vendor's site.
CVE-2024-27306 (aiohttp) — CWE-79 / Attack vector: remote (network-reachable) / unauthenticated Attack surface: `show_index` Patched: `3.9.4` — 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
**Cross-site scripting (XSS)** (CWE-79) exists in aiohttp. Attackers reach the vulnerable code path via ``show_index`` without authentication.
📍 Affected scope
aiohttp — . Attack surface: `show_index`.
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **3.9.4**.
🛡️ 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 'aiohttp' .` 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. 1
    Identify exposure identify 
    grep -r 'aiohttp' . | 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 `aiohttp` を grep し、稼働しているサービス・バージョンを把握する。

  2. 6
    Apply patch patch 
    Upgrade aiohttp to 3.9.4

    ステージング環境で 3.9.4 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。

  3. 7
    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 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 aiohttp
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.9.4"}]}]

References

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