typescript.nestjs.security.audit.nestjs-header-xss-disabled.nestjs-header-xss-disabled

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X-XSS-Protection header is set to 0. This will disable the browser's XSS Filter.

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Defintion

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rules:
  - id: nestjs-header-xss-disabled
    message: X-XSS-Protection header is set to 0. This will disable the browser's
      XSS Filter.
    metadata:
      cwe:
        - "CWE-79: Improper Neutralization of Input During Web Page Generation
          ('Cross-site Scripting')"
      category: security
      technology:
        - nestjs
      owasp:
        - A07:2017 - Cross-Site Scripting (XSS)
        - A03:2021 - Injection
      references:
        - https://owasp.org/Top10/A03_2021-Injection
      cwe2022-top25: true
      cwe2021-top25: true
      subcategory:
        - audit
      likelihood: LOW
      impact: LOW
      confidence: LOW
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]
      vulnerability_class:
        - Cross-Site-Scripting (XSS)
    languages:
      - typescript
    severity: WARNING
    pattern: >
      class $CN {
          ...
          @Header("=~/[Xx]-[Xx][Ss][Ss]-[Pp][Rr][Oo][Tt][Ee][Cc][Tt][Ii][Oo][Nn]/", '0')
          $FN(...) {
              ...
          }
          ...
      }

Examples

nestjs-header-xss-disabled.ts

import { Controller, Get, Header, Redirect, Query } from '@nestjs/common';
import { AppService } from './app.service';

// ruleid:nestjs-header-xss-disabled
@Controller()
export class AppController1 {
  constructor(private readonly appService: AppService) {}

  @Get('test1')
  @Header('X-XSS-Protection', '0')
  getHello1(): string {
    return this.appService.getHello();
  }

}

@Controller()
export class AppController2 {
  constructor(private readonly appService: AppService) {}

  @Get('test1')
  @Header('X-XSS-Protection', '1')
  getHello2(): string {
    return this.appService.getHello();
  }

}