CVE-2020-28446 (Other, published 2022-07-25T14:15Z)
Description: value: The package ntesseract before 0.2.9 are vulnerable to Command Injection via lib/tesseract.js.
Severity: nan (CVSS v3 base score: 9.8)
Weakness: CWE-77 \u2014 Improper Neutralization of Special Elements used in a Command ('Command Injection')
The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.
Repository: https://github.com/taoyuan/ntesseract
Files changed:
.editorconfig
.gitignore
LICENSE
README.md
index.js
lib/tesseract.js
package-lock.json
package.json
test/tesseract.test.js
wercker.yml
Commit message: fix: vulnerable to command injection


Vulnerable code:

Fixed code:
root = true

[*]
indent_style = space
indent_size = 2
charset = utf-8
trim_trailing_whitespace = true
insert_final_newline = true

[*.md]
trim_trailing_whitespace = false
node_modules
.idea
ntesseract: Copyright (c) 2013 Desmond Morris

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
# Tesseract for node.js

[![NPM](https://nodei.co/npm/ntesseract.png)](https://nodei.co/npm/ntesseract/)

A simple wrapper for the Tesseract OCR package for node.js

## Requirements

* Tesseract 3.01 or higher is needed for this to work

## Installation

There is a hard dependency on the [Tesseract project](https://code.google.com/p/tesseract-ocr/).  You can find installation instructions for various platforms on the project site. For Homebrew users, the installation is quick and easy.

```sh
brew install tesseract --with-all-languages
```

The above will install all of the language packages available, if you don't need them all you can remove the `--with-all-languages` flag and install them manually, by downloading them to your local machine and then exposing the `TESSDATA_PREFIX` variable into your path:

```sh
export TESSDATA_PREFIX=~/Downloads/
```

You can then go about installing the node-module to expose the JavaScript API:

```sh
npm install ntesseract
```

## Usage

```JavaScript
var tesseract = require('ntesseract');

// Recognize text of any language in any format
tesseract.process(__dirname + '/path/to/image.jpg',function(err, text) {
	if(err) {
		console.error(err);
	} else {
		console.log(text);
	}
});

// Recognize German text in a single uniform block of text and set the binary path

var options = {
	l: 'deu',
	psm: 6,
	binary: '/usr/local/bin/tesseract'
};

tesseract.process(__dirname + '/path/to/image.jpg', options, function(err, text) {
	if(err) {
		console.error(err);
	} else {
		console.log(text);
	}
});
```

## Changelog
* **0.2.8**: Adds custom output option and extra custom options through starting with '-' in `options` object. 
* **0.2.7**: Adds output file extension detection
* **0.2.6**: Catches exception when deleting tmp files that do not exist
* **0.2.5**: Preserves whitespace and replaces tmp module
* **0.2.4**: Removes console logging for messaging
* **0.2.3**: The ability to set the binary path via the config object.  Better installation documentation.
* **0.2.2**: Adds test converage to utils module
* **0.2.1**: Strips leading & trailing whitespace from output by default
* **0.2.0**: Adds ability to pass options via a configuration object.
* **0.1.1**: Updates tmp module.
* **0.1.0**: Removes preprocessing functionatlity.  See #3.
* **0.0.3**: Adds basic test coverage for process method
* **0.0.2**: Pulls in changes by [joscha](https://github.com/joscha) including: refactored to support tesseract 3.01, added language parameter, config parameter, documentation, Added support for custom preprocessors, OTB Preprocessor using ImageMagick 'convert'
* **0.0.1**: Initial version
'use strict';

module.exports = require('./lib/tesseract');
'use strict';

/**
 * Module dependencies.
 */
const assign = require('lodash.assign');
const exec = require('child_process').exec;
const child_process = require('child_process');
const fs = require('fs');
const tmpdir = require('os').tmpdir(); // let the os take care of removing zombie tmp files
const uuid = require('node-uuid');
const path = require('path');
const glob = require("glob");

const Tesseract = {

  tmpFiles: [],

  timeout: 10000,

  /**
   * options default options passed to Tesseract binary
   * @type {Object}
   */
  options: {
    'l': 'eng',
    'psm': 3,
    'config': null,
    'binary': 'tesseract'
  },

  /**
   * outputEncoding
   * @type {String}
   */
  outputEncoding: 'UTF-8',

  command: function (image, options) {
    if (image.startsWith('"')) {
      image = '"' + image + '"';
    }

    // assemble tesseract command
    const command = [options.binary, image, options.output];

    if (options.l !== null) {
      command.push('-l ' + options.l);
    }

    if (options.psm !== null) {
      command.push('--psm ' + options.psm);
    }

    if (options.config !== null) {
      command.push(options.config);
    }

    const names = Object.keys(options);
    names.forEach(function (name) {
      if (name.indexOf('-') === 0) {
        command.push(name + ' ' + options[name]);
      }
    });

    return command.join(' ');
  },

  /**
   * Runs Tesseract binary with options
   *
   * @param {String} image
   * @param {Object|Function} [options] to pass to Tesseract binary
   * @param {String} [options.binary]
   * @param {String} [options.l] Specify language(s) used for OCR.
   * @param {String} [options.psm] Specify page segmentation mode
   * @param {String} [options.config] Config for OCR
   * @param {String} [options.output] Output base dir for process
   * @param {Function} callback
   */
  process: function(image, options, callback) {
    if (typeof options === 'function') {
      callback = options;
      options = null;
    }

    options = assign({}, Tesseract.options, options);

    // generate output file name
    const output = options.output = path.resolve(options.output || tmpdir, 'ntesseract-' + uuid.v4());

    // add the tmp file to the list
    Tesseract.tmpFiles.push(output);

    const command = Tesseract.command(image, options);

    const opts = options.env || {};

    let timer = setTimeout(function(){}, 100000);

    // Run the tesseract command
    const child = child_process.exec(command, opts, function(err) {
      if (err) {
        // Something went wrong executing the assembled command
        callback(err, null);
        clearTimeout(timer);
        return;
      }

      // Find one of the three possible extension
      glob(output + '.+(html|hocr|txt)', function(err, files){
        if (err) {
          callback(err, null);
          clearTimeout(timer);
          return;
        }
        fs.readFile(files[0], Tesseract.outputEncoding, function(err, data) {
          if (err) {
            callback(err, null);
            clearTimeout(timer);
            return;
          }

          const index = Tesseract.tmpFiles.indexOf(output);
          if (~index) Tesseract.tmpFiles.splice(index, 1);

          fs.unlink(files[0], function () {
            // no-op
          });

          callback(null, data)
          clearTimeout(timer);
        });
      })
    }); // end exec

    timer = setTimeout(function() {
      exec('kill ' + child.pid, function(err, stdout, stderr) {
        callback("This process was terminated for timing out", null);
      });
    }, Tesseract.timeout);

  }

};

function gc() {
  for (let i = Tesseract.tmpFiles.length - 1; i >= 0; i--) {
    try {
      fs.unlinkSync(Tesseract.tmpFiles[i] + '.txt');
    } catch (err) {}

    const index = Tesseract.tmpFiles.indexOf(Tesseract.tmpFiles[i]);
    if (~index) Tesseract.tmpFiles.splice(index, 1);
  }
}

const version = process.versions.node.split('.').map(function(value) {
  return parseInt(value, 10);
});

if (version[0] === 0 && (version[1] < 9 || version[1] === 9 && version[2] < 5)) {
  process.addListener('uncaughtException', function _uncaughtExceptionThrown(err) {
    gc();
    throw err;
  });
}

// clean up the tmp files
process.addListener('exit', function _exit(code) {
  gc();
});

/**
 * Module exports.
 */
module.exports = {
  // expose for testing
  command: Tesseract.command,
  process: Tesseract.process
};
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{
  "name": "ntesseract",
  "version": "0.2.8",
  "authors": [
    "Tao Yuan <towyuan@outlook.com>",
    "Desmond Morris <hi@desmondmorris.com>"
  ],
  "description": "A simple wrapper for the Tesseract OCR package",
  "main": "index.js",
  "repository": {
    "type": "git",
    "url": "https://github.com/taoyuan/ntesseract/"
  },
  "keywords": [
    "tesseract",
    "ocr",
    "text recognition"
  ],
  "dependencies": {
    "glob": "^7.1.6",
    "lodash.assign": "^4.2.0",
    "node-uuid": "^1.4.7"
  },
  "devDependencies": {
    "chai": "^4.2.0",
    "mocha": "~8.2.1"
  },
  "scripts": {
    "test": "mocha"
  },
  "license": "MIT",
  "engine": {
    "node": ">=8.0"
  }
}
'use strict';

const assert = require('chai').assert;
const path = require('path');
const tesseract = require('../lib/tesseract');


describe('process', function () {

  it('should parse options to command', function () {
    const options = {
      binary: 'tesseract-ocr',
      l: 'chs',
      psm: '9',
      output: '/tmp/tesseract',
      '--tessdata-dir': './tessdata',
      '--user-words': './userwords',
      '--user-patterns': './userpatterns'
    };
    const command = 'tesseract-ocr test.png /tmp/tesseract -l chs --psm 9  --tessdata-dir ./tessdata --user-words ./userwords --user-patterns ./userpatterns';
    assert.equal(tesseract.command('test.png', options), command);
  });

  it('should return the string "node-tesseract"', function (done) {
    const image = path.join(__dirname, 'fixtures', 'test.png');
    tesseract.process(image, function (err, text) {
      assert.notOk(err);
      assert.equal(text.trim(), 'node-tesseract');
      done();
    });

  })
});

box: wercker/nodejs
# Build definition
build:

  steps:
    - script:
        name: install tesseract
        code: |
          sudo apt-get update -qq
          sudo apt-get install -qq tesseract-ocr
    - npm-install
    - npm-test