What’s Vulnerable › Vulnerabilities
CVE-2017-17790
- Severity: critical (CVSS 9.8 v3.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 5.9% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2017-12-20 · updated 2026-06-17
- Weakness: CWE-74
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.
Affected products
- Ruby: from 2.2 through 2.2.8; from 2.3 through 2.3.5; from 2.4 through 2.4.2; 2.5.0-preview1
References
- https://access.redhat.com/errata/RHSA-2018:0378
- https://access.redhat.com/errata/RHSA-2018:0583
- https://access.redhat.com/errata/RHSA-2018:0584
- https://access.redhat.com/errata/RHSA-2018:0585
- https://github.com/ruby/ruby/pull/1777
- https://lists.debian.org/debian-lts-announce/2017/12/msg00024.html
- https://lists.debian.org/debian-lts-announce/2017/12/msg00025.html
- https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html
- https://www.debian.org/security/2018/dsa-4259
- https://access.redhat.com/errata/RHSA-2018:0378
- https://access.redhat.com/errata/RHSA-2018:0583
- https://access.redhat.com/errata/RHSA-2018:0584
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