CVE-2017-17790

critical

Published 2017-12-20 · Modified 2026-05-13

CVSS v3

9.8

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2

7.5

VIR risk

9.8

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.

Predictions

Exploit likelihood

97%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2017-17790.html

OS impact

OS	Version	Status	Fixed in
sles		affected

Application impact

Vendor	Product	Versions	Fixed
ruby-lang	ruby	`{"startIncluding":"2.2","endIncluding":"2.2.8"}`
ruby-lang	ruby	`2.5.0`

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://www.suse.com/security/cve/CVE-2017-17790.html

CWEs

CWE-74

Verify integrity in audit chain (admin only). AS-IS.