Invalid OAuth2 Token URL (v3)

• Query id: 3ba0cca1-b815-47bf-ac62-1e584eb64a05
• Query name: Invalid OAuth2 Token URL (v3)
• Platform: OpenAPI
• Severity: Medium
• Category: Access Control
• URL: Github

Description

OAuth2 security scheme flow requires a valid URL in the tokenUrl field
Documentation

Code samples

Code samples with security vulnerabilities

Positive test num. 1 - yaml file

openapi: 3.0.0
info:
  title: Simple API overview
  version: 1.0.0
paths:
  "/":
    get:
      operationId: listVersionsv2
      summary: List API versions
      responses:
        '200':
          description: 200 response
          content:
            application/json:
components:
  securitySchemes:
    oAuth2AuthCodePos1:
      type: oauth2
      description: For more information, see https://api.my.company.com/docs/oauth
      flows:
        authorizationCode:
          authorizationUrl: https://api.my.company.com/oauth/authorize
          tokenUrl: http://example.com#@evil.com/
          scopes:
            read:api: read your apis

Positive test num. 2 - yaml file

openapi: 3.0.0
info:
  title: Simple API overview
  version: 1.0.0
components:
  securitySchemes:
    oAuth2AuthCodePos2:
      type: oauth2
      description: For more information, see https://api.my.company.com/docs/oauth
      flows:
        password:
          tokenUrl: inval`id
          scopes:
            read:api: read your apis
paths:
  "/":
    get:
      operationId: listVersionsv2
      summary: List API versions
      responses:
        '200':
          description: 200 response
          content:
            application/json:

Positive test num. 3 - yaml file

openapi: 3.0.0
info:
  title: Simple API overview
  version: 1.0.0
paths:
  "/":
    get:
      operationId: listVersionsv2
      summary: List API versions
      responses:
        '200':
          description: 200 response
          content:
            application/json:
components:
  securitySchemes:
    oAuth2AuthCodePos3:
      type: oauth2
      description: For more information, see https://api.my.company.com/docs/oauth
      flows:
        clientCredentials:
          tokenUrl: httxps//|api
          scopes:
            read:api: read your apis

Positive test num. 4 - json file

{
  "openapi": "3.0.0",
  "info": {
    "title": "Simple API overview",
    "version": "1.0.0"
  },
  "paths": {
    "/": {
      "get": {
        "operationId": "listVersionsv2",
        "summary": "List API versions",
        "responses": {
          "200": {
            "description": "200 response",
            "content": {
              "application/json": null
            }
          }
        }
      }
    }
  },
  "components": {
    "securitySchemes": {
      "oAuth2AuthCodePos1": {
        "type": "oauth2",
        "description": "For more information, see https://api.my.company.com/docs/oauth",
        "flows": {
          "authorizationCode": {
            "authorizationUrl": "https://api.my.company.com/oauth/authorize",
            "tokenUrl": "http://example.com#@evil.com/",
            "scopes": {
              "read:api": "read your apis"
            }
          }
        }
      }
    }
  }
}

Positive test num. 5 - json file

{
  "openapi": "3.0.0",
  "info": {
    "title": "Simple API overview",
    "version": "1.0.0"
  },
  "components": {
    "securitySchemes": {
      "oAuth2AuthCodePos2": {
        "type": "oauth2",
        "description": "For more information, see https://api.my.company.com/docs/oauth",
        "flows": {
          "password": {
            "tokenUrl": "inval`id",
            "scopes": {
              "read:api": "read your apis"
            }
          }
        }
      }
    }
  },
  "paths": {
    "/": {
      "get": {
        "operationId": "listVersionsv2",
        "summary": "List API versions",
        "responses": {
          "200": {
            "description": "200 response",
            "content": {
              "application/json": null
            }
          }
        }
      }
    }
  }
}

Positive test num. 6 - json file

{
  "openapi": "3.0.0",
  "info": {
    "title": "Simple API overview",
    "version": "1.0.0"
  },
  "paths": {
    "/": {
      "get": {
        "operationId": "listVersionsv2",
        "summary": "List API versions",
        "responses": {
          "200": {
            "description": "200 response",
            "content": {
              "application/json": null
            }
          }
        }
      }
    }
  },
  "components": {
    "securitySchemes": {
      "oAuth2AuthCodePos3": {
        "type": "oauth2",
        "description": "For more information, see https://api.my.company.com/docs/oauth",
        "flows": {
          "clientCredentials": {
            "tokenUrl": "httxps//|api",
            "scopes": {
              "read:api": "read your apis"
            }
          }
        }
      }
    }
  }
}

Code samples without security vulnerabilities

Negative test num. 1 - yaml file

openapi: 3.0.0
info:
  title: Simple API overview
  version: 1.0.0
paths:
  "/":
    get:
      operationId: listVersionsv2
      summary: List API versions
      responses:
        '200':
          description: 200 response
          content:
            application/json:
components:
  securitySchemes:
    oAuth2AuthCodeNeg1:
      type: oauth2
      description: For more information, see https://api.my.company.com/docs/oauth
      flows:
        authorizationCode:
          authorizationUrl: https://api.my.company.com/oauth/authorize
          tokenUrl: http://localhost.com:8080

Negative test num. 2 - json file

{
   "openapi": "3.0.0",
   "info": {
      "title": "Simple API overview",
      "version": "1.0.0"
   },
   "paths": {
      "/": {
         "get": {
            "operationId": "listVersionsv2",
            "summary": "List API versions",
            "responses": {
               "200": {
                  "description": "200 response",
                  "content": {
                     "application/json": null
                  }
               }
            }
         }
      }
   },
   "components": {
      "securitySchemes": {
         "oAuth2AuthCodeNeg2": {
            "type": "oauth2",
            "description": "For more information, see https://api.my.company.com/docs/oauth",
            "flows": {
               "authorizationCode": {
                  "authorizationUrl": "https://api.my.company.com/oauth/authorize",
                  "tokenUrl": "https://api.my.company.com/oauth/token"
               }
            }
         }
      }
   }
}

Negative test num. 3 - yaml file

openapi: 3.0.0
info:
  title: Simple API overview
  version: 1.0.0
paths:
  "/":
    get:
      operationId: listVersionsv2
      summary: List API versions
      responses:
        '200':
          description: 200 response
          content:
            application/json:
components:
  securitySchemes:
    oAuth2AuthCodeNeg3:
      type: oauth2
      description: For more information, see https://api.my.company.com/docs/oauth
      flows:
        authorizationCode:
          authorizationUrl: https://api.my.company.com/oauth/authorize
          tokenUrl: https://api.my.company.com/oauth/token
          scopes:
            read:api: read your apis