RHSA-2021:3982HighCVSS 8.8

Red Hat Security Advisory: rh-ruby30-ruby security update

Published
October 25, 2021
Last Modified
August 4, 2026

🔗 CVE IDs covered (4)

CVE-2020-36327 →CVE-2021-31799 →CVE-2021-31810 →CVE-2021-32066 →

📋 Description

CVE-2020-36327 — rubygem-bundler: Dependencies of gems with explicit source may be installed from a different source CVE-2021-31799 — rubygem-rdoc: Command injection vulnerability in RDoc CVE-2021-31810 — ruby: FTP PASV command response can cause Net::FTP to connect to arbitrary host CVE-2021-32066 — ruby: StartTLS stripping vulnerability in Net::IMAP

🎯 Affected products104

  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)
  • Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)
  • Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7)
  • rh-ruby30-ruby-0:3.0.2-148.el7.ppc64le as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)
  • rh-ruby30-ruby-0:3.0.2-148.el7.ppc64le as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)
  • rh-ruby30-ruby-0:3.0.2-148.el7.s390x as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)
  • rh-ruby30-ruby-0:3.0.2-148.el7.s390x as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)
  • rh-ruby30-ruby-0:3.0.2-148.el7.src as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)
  • rh-ruby30-ruby-0:3.0.2-148.el7.src as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)
  • rh-ruby30-ruby-0:3.0.2-148.el7.src as a component of Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7)
  • rh-ruby30-ruby-0:3.0.2-148.el7.x86_64 as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)
  • rh-ruby30-ruby-0:3.0.2-148.el7.x86_64 as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)
  • rh-ruby30-ruby-0:3.0.2-148.el7.x86_64 as a component of Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7)
  • rh-ruby30-ruby-debuginfo-0:3.0.2-148.el7.ppc64le as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)
  • rh-ruby30-ruby-debuginfo-0:3.0.2-148.el7.ppc64le as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)
  • rh-ruby30-ruby-debuginfo-0:3.0.2-148.el7.s390x as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)
  • rh-ruby30-ruby-debuginfo-0:3.0.2-148.el7.s390x as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)
  • rh-ruby30-ruby-debuginfo-0:3.0.2-148.el7.x86_64 as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)
  • rh-ruby30-ruby-debuginfo-0:3.0.2-148.el7.x86_64 as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)
  • rh-ruby30-ruby-debuginfo-0:3.0.2-148.el7.x86_64 as a component of Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7)
  • rh-ruby30-ruby-default-gems-0:3.0.2-148.el7.noarch as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)
  • rh-ruby30-ruby-default-gems-0:3.0.2-148.el7.noarch as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)
  • rh-ruby30-ruby-default-gems-0:3.0.2-148.el7.noarch as a component of Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7)
  • rh-ruby30-ruby-devel-0:3.0.2-148.el7.ppc64le as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)
  • rh-ruby30-ruby-devel-0:3.0.2-148.el7.ppc64le as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)
  • rh-ruby30-ruby-devel-0:3.0.2-148.el7.s390x as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)
  • rh-ruby30-ruby-devel-0:3.0.2-148.el7.s390x as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)
  • rh-ruby30-ruby-devel-0:3.0.2-148.el7.x86_64 as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)
  • rh-ruby30-ruby-devel-0:3.0.2-148.el7.x86_64 as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)
  • rh-ruby30-ruby-devel-0:3.0.2-148.el7.x86_64 as a component of Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7)
  • +74 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Workaround: This issue only affects configurations where gem packages are installed from multiple sources and the source repositories are explicitly defined for at least some gems. Dependencies of those source-restricted gems may be installed form a different repository, even if the same repository provides those dependencies, which is inconsistent with the intended behaviour described in the Bundler documentation. There are multiple possible approaches to mitigate this issue - customers should evaluate which approaches are usable in their environments. * Explicitly define source for all dependency gems in the Gemfile configuration. When a dependency of a source-restricted gem is also to be installed form the same source, list such dependency explicitly in the Gemfile along with the specific source. * Avoid configurations with multiple source repositories. When using a private repository for non-public gems, use the same private repository to mirror any content required from any public gem repository, such as RubyGems.org. When preparing such mirror, ensure that no mirrored gems have names conflicting with names of the internal non-public gems. * Reserve internal package names in public repositories. For any internal private gem, also reserve the name in any public gem repository used, such as RubyGems.org. This will prevent attackers from registering those names and providing their malicious gems with higher versions. Additional information about affected configurations can be found in the following Red Hat Knowledgebase article: https://access.redhat.com/articles/6206172

🔗 References (7)