CVE-2017-17790
9.8
CRITICAL · CVSS 3.0 · EPSS 5.9% (pctl 93)
In your normal cycle
Critical by CVSS (9.8), but no sign of active exploitation.
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.
Scoring
| CVSS | 9.8 (CRITICAL, v3.0) |
|---|---|
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 5.91% — more likely to be exploited than 93% of all CVEs |
| Weakness | CWE-74 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2017-12-20 |
| Last modified | 2026-06-17 |
Affected (1)
| Vendor | Product |
|---|---|
| ruby-lang | ruby |
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
- 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
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