[ GLSA 202006-05 ] Nokogiri: Command injection

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Gentoo Linux Security Advisory                           GLSA 202006-05
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: Nokogiri: Command injection
     Date: June 13, 2020
     Bugs: #691974
       ID: 202006-05

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Synopsis
========

Nokogiri has a vulnerability allowing arbitrary execution of code if a
certain function is used.

Background
==========

Nokogiri is an HTML, XML, SAX, and Reader parser.

Affected packages
=================

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  dev-ruby/nokogiri            < 1.10.4                  >= 1.10.4

Description
===========

A command injection vulnerability in Nokogiri allows commands to be
executed in a subprocess by Ruby's Kernel.open method. Processes are
vulnerable only if the undocumented method
Nokogiri::CSS::Tokenizer#load_file is being passed untrusted user
input.

Impact
======

A remote attacker could possibly execute arbitrary code with the
privileges of the process.

Workaround
==========

Avoid calling the undocumented method
Nokogiri::CSS::Tokenizer#load_file with untrusted user input.

Resolution
==========

All Nokogiri users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=dev-ruby/nokogiri-1.10.4"

References
==========

[ 1 ] CVE-2019-5477
      https://nvd.nist.gov/vuln/detail/CVE-2019-5477
[ 2 ] Upstream bug
      https://github.com/sparklemotion/nokogiri/issues/1915

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

 https://security.gentoo.org/glsa/202006-05

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
[email protected] or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======

Copyright 2020 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.5

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