Vulnerability in keypair (CVE-2021-41117)
Summary
Vulnerability in keypair (CVE-2021-41117). Confidential information can be exposed externally. Exploitable via defaultSeedFile. Mitigation: upgrade to 1.0.4 or later.
Original description
The description as published by the source.
keypair is a a RSA PEM key generator written in javascript. keypair implements a lot of cryptographic primitives on its own or by borrowing from other libraries where possible, including node-forge. An issue was discovered where this library was generating identical RSA keys used in SSH. This would mean that the library is generating identical P, Q (and thus N) values which, in practical terms, is impossible with RSA-2048 keys. Generating identical values, repeatedly, usually indicates an issue with poor random number generation, or, poor handling of CSPRNG output. Issue 1: Poor random number generation (GHSL-2021-1012). The library does not rely entirely on a platform provided CSPRNG, rather, it uses it's own counter-based CMAC approach. Where things go wrong is seeding the CMAC implementation with "true" random data in the function defaultSeedFile. In order to seed the AES-CMAC generator, the library will take two different approaches depending on the JavaScript execution environment. In a browser, the library will use window.crypto.getRandomValues(). However, in a nodeJS execution environment, the window object is not defined, so it goes down a much less secure solution, also of which has a bug in it. It does look like the library tries to use node's CSPRNG when possible unfortunately, it looks like the crypto object is null because a variable was declared with…
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-2021-41117 has been found in keypair.
Attackers can target a specific entry point like defaultSeedFile over the network to misuse the product.
Confidential information can be exposed externally.
What to do: upgrade keypair to 1.0.4 or later.
If unsure, ask your IT team or search "keypair CVE-2021-41117" on the vendor's site.
CVE-2021-41117 (keypair) — CWE-335
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: defaultSeedFile / window / crypto / null
Patched: 1.0.4 — 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.
A vulnerability (CWE-335) exists in keypair. Attackers reach the vulnerable code path via defaultSeedFile without authentication.
Check the vendor advisory for the affected versions of keypair. Attack surface: defaultSeedFile / window / crypto / null.
Severity: ?. Confidential information can be exposed externally.
Update to 1.0.4.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'keypair' . 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
-
1Identify exposure identify
grep -r 'keypair' . | 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
keypairを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade keypair to 1.0.4ステージング環境で 1.0.4 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を含めること。
-
3Post-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
References
- advisory nvd.nist.gov
- advisory securitylab.github.com
- package github.com
- patch github.com
- report securitylab.github.com
- web github.com
- web github.com