njsscan

njsscan

njsscan is a static application testing (SAST) tool that can find insecure code patterns in your node.js applications using simple pattern matcher from libsast and syntax-aware semantic code pattern search tool semgrep.

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OpSecX Node.js Security: Pentesting and Exploitation - NJS

Installation

pip install njsscan

Requires Python 3.7+ and supports only Mac and Linux

Command Line Options

$ njsscan
usage: njsscan [-h] [--json] [--sarif] [--sonarqube] [--html] [-o OUTPUT] [-c CONFIG] [--missing-controls] [-w] [-v] [path ...]

positional arguments:
  path                  Path can be file(s) or directories with source code

optional arguments:
  -h, --help            show this help message and exit
  --json                set output format as JSON
  --sarif               set output format as SARIF 2.1.0
  --sonarqube           set output format compatible with SonarQube
  --html                set output format as HTML
  -o OUTPUT, --output OUTPUT
                        output filename to save the result
  -c CONFIG, --config CONFIG
                        Location to .njsscan config file
  --missing-controls    enable missing security controls check
  -w, --exit-warning    non zero exit code on warning
  -v, --version         show njsscan version

Example Usage

$ njsscan test.js
- Pattern Match ████████████████████████████████████████████████████████████ 1
- Semantic Grep ███████████████████████████ 160

njsscan: v0.1.9 | Ajin Abraham | opensecurity.in
╒═════════════╤═══════════════════════════════════════════════════════════════════════════════════════════════╕
│ RULE ID     │ express_xss                                                                                   │
├─────────────┼───────────────────────────────────────────────────────────────────────────────────────────────┤
│ OWASP       │ A1: Injection                                                                                 │
├─────────────┼───────────────────────────────────────────────────────────────────────────────────────────────┤
│ CWE         │ CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')  │
├─────────────┼───────────────────────────────────────────────────────────────────────────────────────────────┤
│ DESCRIPTION │ Untrusted User Input in Response will result in Reflected Cross Site Scripting Vulnerability. │
├─────────────┼───────────────────────────────────────────────────────────────────────────────────────────────┤
│ SEVERITY    │ ERROR                                                                                         │
├─────────────┼───────────────────────────────────────────────────────────────────────────────────────────────┤
│ FILES       │ ╒════════════════╤═══════════════════════════════════════════════╕                            │
│             │ │ File           │ test.js                                       │                            │
│             │ ├────────────────┼───────────────────────────────────────────────┤                            │
│             │ │ Match Position │ 5 - 46                                        │                            │
│             │ ├────────────────┼───────────────────────────────────────────────┤                            │
│             │ │ Line Number(s) │ 7: 8                                          │                            │
│             │ ├────────────────┼───────────────────────────────────────────────┤                            │
│             │ │ Match String   │ const { name } = req.query;                   │                            │
│             │ │                │     res.send('<h1> Hello :' + name + "</h1>") │                            │
│             │ ╘════════════════╧═══════════════════════════════════════════════╛                            │
╘═════════════╧═══════════════════════════════════════════════════════════════════════════════════════════════╛

nodejsscan SAST

nodejsscan, built on top of njsscan provides a full fledged vulnerability management user interface along with other nifty integrations.

See nodejsscan

Python API

>>> from njsscan.njsscan import NJSScan
>>> node_source = '/node_source/true_positives/sqli_node.js'
>>> scanner = NJSScan([node_source], json=True, check_controls=False)
>>> scanner.scan()
{
    'templates': {},
    'nodejs': {
        'node_sqli_injection': {
            'files': [{
                'file_path': '/node_source/true_positives/sqli_node.js',
                'match_position': (1, 24),
                'match_lines': (4, 11),
                'match_string': 'var employeeId = req.foo;\n\nvar sql = "SELECT * FROM trn_employee WHERE employee_id = " + employeeId;\n\n\n\nconnection.query(sql, function (error, results, fields) {\n\n    if (error) {\n\n        throw error;\n\n    }\n\n    console.log(results);'
            }],
            'metadata': {
                'owasp': 'A1: Injection',
                'cwe': "CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')",
                'description': 'Untrusted input concatinated with raw SQL query can result in SQL Injection.',
                'severity': 'ERROR'
            }
        }
    },
    'errors': []
}

Configure njsscan

A .njsscan file in the root of the source code directory allows you to configure njsscan. You can also use a custom .njsscan file using --config argument.

---
- nodejs-extensions:
  - .js

  template-extensions:
  - .new
  - .hbs
  - ''

  ignore-filenames:
  - skip.js

  ignore-paths:
  - __MACOSX
  - skip_dir
  - node_modules

  ignore-extensions:
  - .jsx

  ignore-rules:
  - regex_injection_dos
  - pug_jade_template

  severity-filter:
  - WARNING
  - ERROR

Suppress Findings

You can suppress findings from javascript source files by adding the comment // njsscan-ignore: rule_id1, rule_id2 to the line that trigger the findings.

Example:

app.get('/some/redirect', function (req, res) {
    var target = req.param("target");
    res.redirect(target); // njsscan-ignore: express_open_redirect
});

CI/CD Integrations

You can enable njsscan in your CI/CD or DevSecOps pipelines.

Github Action

Add the following to the file .github/workflows/njsscan.yml.

name: njsscan
on:
  push:
    branches: [ master, main ]
  pull_request:
    branches: [ master, main ]
jobs:
  njsscan:
    runs-on: ubuntu-latest
    name: njsscan check
    steps:
    - name: Checkout the code
      uses: actions/checkout@v4.2.2
    - uses: actions/setup-python@v5.3.0
      with:
        python-version: '3.12'
    - name: nodejsscan scan
      id: njsscan
      uses: ajinabraham/njsscan-action@master
      with:
        args: '.'

Example: dvna with njsscan github action

Github Code Scanning Integration

Add the following to the file .github/workflows/njsscan_sarif.yml.

name: njsscan sarif
on:
  push:
    branches: [ master, main ]
  pull_request:
    branches: [ master, main ]
jobs:
  njsscan:
    runs-on: ubuntu-latest
    name: njsscan code scanning
    steps:
    - name: Checkout the code
      uses: actions/checkout@v4.2.2
    - uses: actions/setup-python@v5.3.0
      with:
        python-version: '3.12'
    - name: nodejsscan scan
      id: njsscan
      uses: ajinabraham/njsscan-action@master
      with:
        args: '. --sarif --output results.sarif || true'
    - name: Upload njsscan report
      uses: github/codeql-action/upload-sarif@v3
      with:
        sarif_file: results.sarif

Gitlab CI/CD

Add the following to the file .gitlab-ci.yml.

stages:
    - test
njsscan:
    image: python
    before_script:
        - pip3 install --upgrade njsscan
    script:
        - njsscan .

Example: dvna with njsscan gitlab

Travis CI

Add the following to the file .travis.yml.

language: python
install:
    - pip3 install --upgrade njsscan
script:
    - njsscan .

Circle CI

Add the following to the file .circleci/config.yaml

version: 2.1
jobs:
  njsscan:
    docker:
      - image: cimg/python:3.9.6
    steps:
      - checkout
      - run:
          name: Install njsscan
          command: pip install --upgrade njsscan
      - run:
           name: njsscan check
           command: njsscan .

Docker

Prebuilt image from DockerHub

docker pull opensecurity/njsscan
docker run -v /path-to-source-dir:/src opensecurity/njsscan /src

Build Locally

docker build -t njsscan .
docker run -v /path-to-source-dir:/src njsscan /src