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GHSA-gq4g-fpc9-vjfq

Vulnerability in web-auth/webauthn-lib (GHSA-gq4g-fpc9-vjfq)

Summary

vulnerability in web-auth/webauthn-lib (GHSA-gq4g-fpc9-vjfq). Risk of unauthorized operations or information disclosure. Exploitable via ``FakeCredentialGenerator``. Mitigation: upgrade to `5.3.5` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **GHSA-gq4g-fpc9-vjfq** has been found in web-auth/webauthn-lib. Attackers can target a specific entry point like ``FakeCredentialGenerator`` over the network to misuse the product. Risk of unauthorized operations or information disclosure. CVSS score: ?/10. What to do: upgrade web-auth/webauthn-lib to **5.3.5** or later. If unsure, ask your IT team or search "web-auth/webauthn-lib GHSA-gq4g-fpc9-vjfq" on the vendor's site.
GHSA-gq4g-fpc9-vjfq (web-auth/webauthn-lib) — CWE-204 / Attack surface: `FakeCredentialGenerator` / `PublicKeyCredentialDescriptor` / `SimpleFakeCredentialGenerator` / `kernel.secret` Patched: `5.3.5` — apply immediately Workaround: Construct `SimpleFakeCredentialGenerator` with a non-empty secret value (for example the application secret), or provide a custom `FakeCredentialGenerator` implementation seeded with a secret. 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-204) exists in web-auth/webauthn-lib. Attackers reach the vulnerable code path via ``FakeCredentialGenerator`` without authentication.
📍 Affected scope
web-auth/webauthn-lib — . Attack surface: `FakeCredentialGenerator` / `PublicKeyCredentialDescriptor` / `SimpleFakeCredentialGenerator` / `kernel.secret`.
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **5.3.5**.
🛡️ Workaround
Workaround: Construct `SimpleFakeCredentialGenerator` with a non-empty secret value (for example the application secret), or provide a custom `FakeCredentialGenerator` implementation seeded with a secret.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'web-auth/webauthn-lib' .` 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 'web-auth/webauthn-lib' . | 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 `web-auth/webauthn-lib` を grep し、稼働しているサービス・バージョンを把握する。

  2. 5
    Apply temporary workaround mitigate
    Construct `SimpleFakeCredentialGenerator` with a non-empty secret value (for example the application secret), or provide a custom `FakeCredentialGenerator` implementation seeded with a secret.

    パッチが適用されるまでの応急処置として、Construct `SimpleFakeCredentialGenerator` with a non-empty secret value (for example the application secret), or provide a custom `FakeCredentialGenerator` implementation seeded with a secret. を実施。回避策の副作用 (機能低下) を確認した上で。

  3. 6
    Apply patch patch
    Upgrade web-auth/webauthn-lib to 5.3.5

    ステージング環境で 5.3.5 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。

  4. 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

composer web-auth/webauthn-lib
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.3.5"}]}]

References

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