Undefined Scope 'securityDefinition' On Global 'security' Field

• Query id: 9aa6e95c-d964-4239-a3a8-9f37a3c5a31f
• Query name: Undefined Scope 'securityDefinition' On Global 'security' Field
• Platform: OpenAPI
• Severity: Low
• Category: Access Control
• CWE: 284
• URL: Github

Description

Using a scope on global security field that is undefined on 'securityDefinitions' can be defined by an attacker
Documentation

Code samples

Code samples with security vulnerabilities

Positive test num. 1 - yaml file

swagger: "2.0"
info:
  title: Simple API Overview
  version: 1.0.0
paths:
  /:
    get:
      operationId: listVersionsv2
      summary: List API versions
      responses:
        "200":
          description: Success
securityDefinitions:
  oAuth2AuthCodeNeg2:
    type: oauth2
    description: For more information, see https://api.my.company.com/docs/oauth
    flow: authorizationCode
    authorizationUrl: https://api.my.company.com/oauth/authorize
    tokenUrl: https://api.my.company.com/oauth/token
    scopes:
      read:api: read your apis
security:
  oAuth2AuthCodeNeg2:
    - read:api
    - error:api

Positive test num. 2 - json file

{
  "swagger": "2.0",
  "info": {
    "title": "Simple API Overview",
    "version": "1.0.0"
  },
  "paths": {
    "/": {
      "get": {
        "operationId": "listVersionsv2",
        "summary": "List API versions",
        "responses": {
          "200": {
            "description": "Success"
          }
        }
      }
    }
  },
  "securityDefinitions": {
    "oAuth2AuthCodeNeg2": {
      "type": "oauth2",
      "description": "For more information, see https://api.my.company.com/docs/oauth",
      "flow": "authorizationCode",
      "authorizationUrl": "https://api.my.company.com/oauth/authorize",
      "tokenUrl": "https://api.my.company.com/oauth/token",
      "scopes": {
        "read:api": "read your apis"
      }
    }
  },
  "security": {
    "oAuth2AuthCodeNeg2": [
      "read:api",
      "error:api"
    ]
  }
}

Code samples without security vulnerabilities

Negative test num. 1 - yaml file

swagger: "2.0"
info:
  title: Simple API Overview
  version: 1.0.0
paths:
  /:
    get:
      operationId: listVersionsv2
      summary: List API versions
      responses:
        "200":
          description: Success
securityDefinitions:
  oAuth2AuthCodeNeg2:
    type: oauth2
    description: For more information, see https://api.my.company.com/docs/oauth
    flow: authorizationCode
    authorizationUrl: https://api.my.company.com/oauth/authorize
    tokenUrl: https://api.my.company.com/oauth/token
    scopes:
      read:api: read your apis
security:
  oAuth2AuthCodeNeg2:
    - read:api

Negative test num. 2 - json file

{
  "swagger": "2.0",
  "info": {
    "title": "Simple API Overview",
    "version": "1.0.0"
  },
  "paths": {
    "/": {
      "get": {
        "operationId": "listVersionsv2",
        "summary": "List API versions",
        "responses": {
          "200": {
            "description": "Success"
          }
        }
      }
    }
  },
  "securityDefinitions": {
    "oAuth2AuthCodeNeg2": {
      "type": "oauth2",
      "description": "For more information, see https://api.my.company.com/docs/oauth",
      "flow": "authorizationCode",
      "authorizationUrl": "https://api.my.company.com/oauth/authorize",
      "tokenUrl": "https://api.my.company.com/oauth/token",
      "scopes": {
        "read:api": "read your apis"
      }
    }
  },
  "security": {
    "oAuth2AuthCodeNeg2": [
      "read:api"
    ]
  }
}