Security Fix for Command Injection - huntr.dev

https://huntr.dev/app/users/toufik-airane has fixed the Command Injection vulnerability 🔨. toufik-airane has been awarded $25 for fixing the vulnerability through the huntr bug bounty program 💵. Think you could fix a vulnerability like this?

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📊 Metadata

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Bounty URL: https://www.huntr.dev/bounties/1-npm-jison

⚙️ Description

Describe your fix clearly and concisely - imagine you are describing it to a non-technical friend.

This patch fixes a command injection in Jison package. A command injection is a cybersecurity vulnerability that could lead to execute arbitrary commands on the host operating system over a vulnerable application. (OWASP)

💻 Technical Description

Describe in-depth, the technical implementation of the proposed security fix. Imagine you are describing it to a NASA engineer.

The package handled untrusted user input inside an exec() function. exec() is used to execute operating system command with the privilege of the application. I've simply removed exec function for a more trusted one: execFile().

🐛 Proof of Concept (PoC)

Provide the vulnerability exploit to show the security issue you're fixing.

>  Jison [master] ⚡  node csharp.js ";touch HACKED"
Executing: jison ;touch HACKED

>  Jison [master] ⚡  ls
HACKED

🔥 Proof of Fix (PoF)

Replay the vulnerability exploit to show the successful fix and mitigation of the vulnerability.

>  Jison [master] ⚡  node csharp.js ";touch HACKED"
Executing: jison ;touch HACKED
Error: Command failed: jison ;touch HACKED

Error: ENOENT: no such file or directory, open ';touch HACKED'
    ...
  errno: -2,
  syscall: 'open',
  code: 'ENOENT',
  path: ';touch HACKED'
}

    ...
  killed: false,
  code: 1,
  signal: null,
  cmd: 'jison ;touch HACKED'
}

👍 User Acceptance Testing (UAT)

Run a unit test or a legitimate use case to prove that your fix does not introduce breaking changes.

 Jison [master] ⚡  yarn test
yarn run v1.22.4
$ node tests/all-tests.js
Running all tests: ...
Passed:91 Failed:0 Errors:2

The errors aren't coming from the change.

zaach / jison