Description
The lazy_initialize function in lib/resolv.rb in Ruby through 2.4.3 uses Kernel#open, which might allow Command Injection attacks, as demonstrated by a Resolv::Hosts::new argument beginning with a '|' character, a different vulnerability than CVE-2017-17405. NOTE: situations with untrusted input may be highly unlikely.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 9 | ruby2.3 | 2.3.3-1+deb9u3 | DSA-4259-1 |
| Debian 8 | ruby2.1 | 2.1.5-2+deb8u4 | DLA-1421-1 |
| Debian 7 | ruby1.8 | 1.8.7.358-7.1+deb7u5 | DLA-1222-1 |
| Debian 7 | ruby1.9.1 | 1.9.3.194-8.1+deb7u7 | DLA-1221-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | ruby2.3 | 2.3.1-2~16.04.5 | USN-3528-1 |
| Ubuntu 14.04 LTS | ruby1.9.1 | 1.9.3.484-2ubuntu1.7 | USN-3528-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | ruby +5 | 2.0.0.648-33.el7_4 | RHSA-2018:0378 |
| RHEL 7 | rubygem-bigdecimal | 1.2.0-33.el7_4 | RHSA-2018:0378 |
| RHEL 7 | rubygem-io-console | 0.4.2-33.el7_4 | RHSA-2018:0378 |
| RHEL 7 | rubygem-json | 1.7.7-33.el7_4 | RHSA-2018:0378 |
| RHEL 7 | rubygem-minitest | 4.3.2-33.el7_4 | RHSA-2018:0378 |
| RHEL 7 | rubygem-psych | 2.0.0-33.el7_4 | RHSA-2018:0378 |
| RHEL 7 | rubygem-rake | 0.9.6-33.el7_4 | RHSA-2018:0378 |
| RHEL 7 | rubygem-rdoc | 4.0.0-33.el7_4 | RHSA-2018:0378 |
| RHEL 7 | rubygems +1 | 2.0.14.1-33.el7_4 | RHSA-2018:0378 |
| RHEL 3 | rh-ruby22-ruby +5 | 2.2.9-19.el6 | RHSA-2018:0583 |
| RHEL 3 | rh-ruby22-rubygem-bigdecimal | 1.2.6-19.el6 | RHSA-2018:0583 |
| RHEL 3 | rh-ruby22-rubygem-io-console | 0.4.3-19.el6 | RHSA-2018:0583 |
| RHEL 3 | rh-ruby22-rubygem-json | 1.8.1.1-19.el6 | RHSA-2018:0583 |
| RHEL 3 | rh-ruby22-rubygem-minitest | 5.4.3-19.el6 | RHSA-2018:0583 |
| RHEL 3 | rh-ruby22-rubygem-power_assert | 0.2.2-19.el6 | RHSA-2018:0583 |
| RHEL 3 | rh-ruby22-rubygem-psych | 2.0.8.1-19.el6 | RHSA-2018:0583 |
| RHEL 3 | rh-ruby22-rubygem-rake | 10.4.2-19.el6 | RHSA-2018:0583 |
| RHEL 3 | rh-ruby22-rubygem-rdoc | 4.2.0-19.el6 | RHSA-2018:0583 |
| RHEL 3 | rh-ruby22-rubygem-test-unit | 3.0.8-19.el6 | RHSA-2018:0583 |
| RHEL 3 | rh-ruby22-rubygems +1 | 2.4.5.4-19.el6 | RHSA-2018:0583 |
| RHEL 3 | rh-ruby23-ruby +5 | 2.3.6-67.el6 | RHSA-2018:0585 |
| RHEL 3 | rh-ruby23-rubygem-bigdecimal | 1.2.8-67.el6 | RHSA-2018:0585 |
| RHEL 3 | rh-ruby23-rubygem-did_you_mean | 1.0.0-67.el6 | RHSA-2018:0585 |
| RHEL 3 | rh-ruby23-rubygem-io-console | 0.4.5-67.el6 | RHSA-2018:0585 |
| RHEL 3 | rh-ruby23-rubygem-json | 1.8.3.1-67.el6 | RHSA-2018:0585 |
| RHEL 3 | rh-ruby23-rubygem-minitest | 5.8.5-67.el6 | RHSA-2018:0585 |
| RHEL 3 | rh-ruby23-rubygem-net-telnet | 0.1.1-67.el6 | RHSA-2018:0585 |
| RHEL 3 | rh-ruby23-rubygem-power_assert | 0.2.6-67.el6 | RHSA-2018:0585 |
| RHEL 3 | rh-ruby23-rubygem-psych | 2.1.0.1-67.el6 | RHSA-2018:0585 |
| RHEL 3 | rh-ruby23-rubygem-rake | 10.4.2-67.el6 | RHSA-2018:0585 |
| RHEL 3 | rh-ruby23-rubygem-rdoc | 4.2.1-67.el6 | RHSA-2018:0585 |
| RHEL 3 | rh-ruby23-rubygem-test-unit | 3.1.5-67.el6 | RHSA-2018:0585 |
| RHEL 3 | rh-ruby23-rubygems +1 | 2.5.2.2-67.el6 | RHSA-2018:0585 |
| RHEL 3 | rh-ruby24-ruby +4 | 2.4.3-90.el6 | RHSA-2018:0584 |
| RHEL 3 | rh-ruby24-rubygem-bigdecimal | 1.3.0-90.el6 | RHSA-2018:0584 |
| RHEL 3 | rh-ruby24-rubygem-did_you_mean | 1.1.0-90.el6 | RHSA-2018:0584 |
| RHEL 3 | rh-ruby24-rubygem-io-console | 0.4.6-90.el6 | RHSA-2018:0584 |
| RHEL 3 | rh-ruby24-rubygem-json | 2.0.4-90.el6 | RHSA-2018:0584 |
| RHEL 3 | rh-ruby24-rubygem-minitest | 5.10.1-90.el6 | RHSA-2018:0584 |
| RHEL 3 | rh-ruby24-rubygem-net-telnet | 0.1.1-90.el6 | RHSA-2018:0584 |
| RHEL 3 | rh-ruby24-rubygem-openssl | 2.0.5-90.el6 | RHSA-2018:0584 |
| RHEL 3 | rh-ruby24-rubygem-power_assert | 0.4.1-90.el6 | RHSA-2018:0584 |
| RHEL 3 | rh-ruby24-rubygem-psych | 2.2.2-90.el6 | RHSA-2018:0584 |
| RHEL 3 | rh-ruby24-rubygem-rake | 12.0.0-90.el6 | RHSA-2018:0584 |
| RHEL 3 | rh-ruby24-rubygem-rdoc | 5.0.0-90.el6 | RHSA-2018:0584 |
| RHEL 3 | rh-ruby24-rubygem-test-unit | 3.2.3-90.el6 | RHSA-2018:0584 |
| RHEL 3 | rh-ruby24-rubygem-xmlrpc | 0.2.1-90.el6 | RHSA-2018:0584 |
| RHEL 3 | rh-ruby24-rubygems +1 | 2.6.14-90.el6 | RHSA-2018:0584 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | ruby2.1 | 2.1.9-19.3.2 | SUSE-SU-2020:1570-1 |
| SLES 12 SP4 | ruby2.1 | 2.1.9-19.3.2 | SUSE-SU-2020:1570-1 |
| SLES 12 SP3 | ruby2.1 | 2.1.9-19.3.2 | SUSE-SU-2020:1570-1 |
| SLES 12 SP2 | ruby2.1 | 2.1.9-19.3.2 | SUSE-SU-2020:1570-1 |
| SLES 12 SP2 | yast2-ruby-bindings | 3.1.53-9.8.1 | SUSE-SU-2020:1570-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP5 | ruby2.1 | 2.1.9-19.3.2 | SUSE-SU-2020:1570-1 |
| SLES for SAP 12 SP4 | ruby2.1 | 2.1.9-19.3.2 | SUSE-SU-2020:1570-1 |
| SLES for SAP 12 SP3 | ruby2.1 | 2.1.9-19.3.2 | SUSE-SU-2020:1570-1 |
| SLES for SAP 12 SP2 | ruby2.1 | 2.1.9-19.3.2 | SUSE-SU-2020:1570-1 |
| SLES for SAP 12 SP2 | yast2-ruby-bindings | 3.1.53-9.8.1 | SUSE-SU-2020:1570-1 |
| SUSE OpenStack Cloud Crowbar 8 | ruby2.1 | 2.1.9-19.3.2 | SUSE-SU-2020:1570-1 |
| SUSE OpenStack Cloud 8 | ruby2.1 | 2.1.9-19.3.2 | SUSE-SU-2020:1570-1 |
| SUSE OpenStack Cloud 7 | ruby2.1 | 2.1.9-19.3.2 | SUSE-SU-2020:1570-1 |
| SUSE OpenStack Cloud 7 | yast2-ruby-bindings | 3.1.53-9.8.1 | SUSE-SU-2020:1570-1 |
| SUSE HPE Helion OpenStack 8 | ruby2.1 | 2.1.9-19.3.2 | SUSE-SU-2020:1570-1 |
| SUSE Enterprise Storage 5 | ruby2.1 | 2.1.9-19.3.2 | SUSE-SU-2020:1570-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | ruby +5 | 2.0.0.648-33.amzn2.0.1 | ALAS2-2018-983 |
| Amazon Linux 2 | rubygem-bigdecimal | 1.2.0-33.amzn2.0.1 | ALAS2-2018-983 |
| Amazon Linux 2 | rubygem-io-console | 0.4.2-33.amzn2.0.1 | ALAS2-2018-983 |
| Amazon Linux 2 | rubygem-json | 1.7.7-33.amzn2.0.1 | ALAS2-2018-983 |
| Amazon Linux 2 | rubygem-minitest | 4.3.2-33.amzn2.0.1 | ALAS2-2018-983 |
| Amazon Linux 2 | rubygem-psych | 2.0.0-33.amzn2.0.1 | ALAS2-2018-983 |
| Amazon Linux 2 | rubygem-rake | 0.9.6-33.amzn2.0.1 | ALAS2-2018-983 |
| Amazon Linux 2 | rubygem-rdoc | 4.0.0-33.amzn2.0.1 | ALAS2-2018-983 |
| Amazon Linux 2 | rubygems +1 | 2.0.14.1-33.amzn2.0.1 | ALAS2-2018-983 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | ruby +5 | 2.0.0.648-33.el7_4 | ELSA-2018-0378 |
| Oracle Linux 7 | rubygem-bigdecimal | 1.2.0-33.el7_4 | ELSA-2018-0378 |
| Oracle Linux 7 | rubygem-io-console | 0.4.2-33.el7_4 | ELSA-2018-0378 |
| Oracle Linux 7 | rubygem-json | 1.7.7-33.el7_4 | ELSA-2018-0378 |
| Oracle Linux 7 | rubygem-minitest | 4.3.2-33.el7_4 | ELSA-2018-0378 |
| Oracle Linux 7 | rubygem-psych | 2.0.0-33.el7_4 | ELSA-2018-0378 |
| Oracle Linux 7 | rubygem-rake | 0.9.6-33.el7_4 | ELSA-2018-0378 |
| Oracle Linux 7 | rubygem-rdoc | 4.0.0-33.el7_4 | ELSA-2018-0378 |
| Oracle Linux 7 | rubygems +1 | 2.0.14.1-33.el7_4 | ELSA-2018-0378 |
Advisories 12
- RHSA-2018:0585 Red Hat Security Advisory: rh-ruby23-ruby security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2018:0584 Red Hat Security Advisory: rh-ruby24-ruby security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2018:0583 Red Hat Security Advisory: rh-ruby22-ruby security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2018:0378 Red Hat Security Advisory: ruby security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- USN-3528-1 ruby1.9.1, ruby2.3 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4259-1 ruby2.3 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1222-1 ruby1.8 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1221-1 ruby1.9.1 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1421-1 ruby2.1 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2020:1570-1 Security update for ruby2.1 SUSE / openSUSE Security Updates · Feb 4, 2026
- ALAS2-2018-983 Low: ruby security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Sep 23, 2025
- ELSA-2018-0378 Important: ruby security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Feb 28, 2018
References
- RHSA-2018:0585 vendor-advisory
- [debian-lts-announce] 20171225 [SECURITY] [DLA 1222-1] ruby1.8 security update mailing-list
- RHSA-2018:0378 vendor-advisory
- https://github.com/ruby/ruby/pull/1777
- RHSA-2018:0584 vendor-advisory
- [debian-lts-announce] 20180714 [SECURITY] [DLA 1421-1] ruby2.1 security update mailing-list
- RHSA-2018:0583 vendor-advisory
- [debian-lts-announce] 20171225 [SECURITY] [DLA 1221-1] ruby1.9.1 security update mailing-list
- DSA-4259 vendor-advisory