ruby.jwt.security.jwt-hardcode.ruby-jwt-hardcoded-secret

Verifed by r2c
Community Favorite
profile photo of returntocorpreturntocorp
Author
63,819
Download Count*
LGPL Commons Clause
License

Hardcoded JWT secret or private key is used. This is a Insufficiently Protected Credentials weakness: https://cwe.mitre.org/data/definitions/522.html Consider using an appropriate security mechanism to protect the credentials (e.g. keeping secrets in environment variables)

Run Locally

Run in CI

Semgrep CI docs

Defintion

Edit RuleView Source
Open in Playground 
rules:
  - id: ruby-jwt-hardcoded-secret
    message: "Hardcoded JWT secret or private key is used. This is a Insufficiently
      Protected Credentials weakness:
      https://cwe.mitre.org/data/definitions/522.html Consider using an
      appropriate security mechanism to protect the credentials (e.g. keeping
      secrets in environment variables)"
    metadata:
      cwe:
        - "CWE-522: Insufficiently Protected Credentials"
      owasp:
        - A02:2017 - Broken Authentication
        - A04:2021 - Insecure Design
      source-rule-url: https://semgrep.dev/blog/2020/hardcoded-secrets-unverified-tokens-and-other-common-jwt-mistakes/
      category: security
      technology:
        - jwt
      references:
        - https://owasp.org/Top10/A04_2021-Insecure_Design
      cwe2021-top25: true
      subcategory:
        - audit
      likelihood: LOW
      impact: LOW
      confidence: LOW
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]
      vulnerability_class:
        - Cryptographic Issues
    patterns:
      - pattern-inside: |
          require 'jwt'
          ...
      - pattern-either:
          - pattern: |
              JWT.encode($PAYLOAD,"...",...)
          - pattern: |
              JWT.decode($PAYLOAD,"...",...)
          - pattern: |
              JWT.encode($PAYLOAD,nil,...)
          - pattern: |
              JWT.decode($PAYLOAD,nil,...)
          - pattern: |
              $SECRET = "..."
              ...
              JWT.encode($PAYLOAD,$SECRET,...)
          - pattern: |
              $SECRET = "..."
              ...
              JWT.decode($PAYLOAD,$SECRET,...)
    languages:
      - ruby
    severity: ERROR

Examples

jwt-hardcode.rb

require 'jwt'

# ruleid: ruby-jwt-hardcoded-secret
secret_const = 'secret-yo'

def bad1
    # ruleid: ruby-jwt-hardcoded-secret
    hmac_secret = 'my$ecretK3y'
    # ruleid: ruby-jwt-hardcoded-secret
    token = JWT.encode payload, hmac_secret, 'HS256'
    puts token
end

def bad2(token)
    # ruleid: ruby-jwt-hardcoded-secret
    decoded_token = JWT.decode token, secret_const, true, { algorithm: 'HS256' }
    puts decoded_token
end

def bad3
    # ruleid: ruby-jwt-hardcoded-secret
    token = JWT.encode payload, 'hardcode', 'HS256'
    puts token
end

def bad4
    # ruleid: ruby-jwt-hardcoded-secret
    token = JWT.encode payload, nil, 'HS256'
    puts token
end

def ok1(secret_key)
    # ok: ruby-jwt-hardcoded-secret
    token = JWT.encode payload, hmac_secret, 'HS256'
    puts token
    decoded_token = JWT.decode token, secret_key, true, { algorithm: 'HS256' }
    puts decoded_token
end