Command Injection Affecting libvcs package, versions [,0.11.1)


0.0
high

Snyk CVSS

    Attack Complexity High
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    Exploit Maturity Proof of concept
    EPSS 0.38% (73rd percentile)
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NVD
9.8 critical

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  • Snyk ID SNYK-PYTHON-LIBVCS-2421204
  • published 14 Mar 2022
  • disclosed 11 Mar 2022
  • credit Alessio Della Libera of Snyk Research Team

How to fix?

Upgrade libvcs to version 0.11.1 or higher.

Overview

libvcs is a vcs abstraction layer.

Affected versions of this package are vulnerable to Command Injection via argument injection. When calling the update_repo function (when using hg), the url parameter is passed to the hg clone command. By injecting some hg options it was possible to get arbitrary command execution.

PoC

from libvcs.shortcuts import create_repo

r = create_repo(url='--config=alias.clone=!touch ./HELLO', vcs='hg', repo_dir='./')

r.update_repo()