Arch Linux Security Advisory ASA-202106-14
=========================================
Severity: Medium
Date    : 2021-06-01
CVE-ID  : CVE-2020-36327
Package : ruby-bundler
Type    : insufficient validation
Remote  : Yes
Link    : https://security.archlinux.org/AVG-1891

Summary
======
The package ruby-bundler before version 2.2.18-1 is vulnerable to
insufficient validation.

Resolution
=========
Upgrade to 2.2.18-1.

# pacman -Syu "ruby-bundler>=2.2.18-1"

The problem has been fixed upstream in version 2.2.18.

Workaround
=========
None.

Description
==========
Bundler 1.16.0 through 2.2.9 and 2.2.11 through 2.2.17 sometimes
chooses a dependency source based on the highest gem version number,
which means that a rogue gem found at a public source may be chosen,
even if the intended choice was a private gem that is a dependency of
another private gem that is explicitly depended on by the application.

Impact
=====
A remote attacker could replace a private gem in a project with a
public gem under their control with a higher version number.

References
=========
https://github.com/rubygems/rubygems/issues/3982
https://github.com/rubygems/rubygems/pull/4609
https://github.com/rubygems/rubygems/commit/d68d3cdb9cc69f648f87e5d3f25881677c1179ea
https://security.archlinux.org/CVE-2020-36327