CVE-2018-8779

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 6.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-04-03 · updated 2026-06-17
Weakness: CWE-20

Description

In Ruby before 2.2.10, 2.3.x before 2.3.7, 2.4.x before 2.4.4, 2.5.x before 2.5.1, and 2.6.0-preview1, the UNIXServer.open and UNIXSocket.open methods are not checked for null characters. It may be connected to an unintended socket.

Affected products

Canonical Ubuntu Linux: 14.04, 16.04, 17.10
Debian Linux: 7.0, 8.0, 9.0
Ruby: from 2.2.0 before 2.2.10; from 2.3.0 before 2.3.7; from 2.4.0 before 2.4.4; from 2.5.0 before 2.5.1; 2.6.0-preview1 — fixed in 2.2.10, 2.3.7, 2.4.4, 2.5.1

How to fix

Upgrade to a fixed version: Ruby 2.2.10, 2.3.7, 2.4.4, 2.5.1. Check the vendor advisory for mitigations.

References

http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html
http://www.securityfocus.com/bid/103767
http://www.securitytracker.com/id/1042004
https://access.redhat.com/errata/RHSA-2018:3729
https://access.redhat.com/errata/RHSA-2018:3730
https://access.redhat.com/errata/RHSA-2018:3731
https://access.redhat.com/errata/RHSA-2019:2028
https://lists.debian.org/debian-lts-announce/2018/04/msg00023.html
https://lists.debian.org/debian-lts-announce/2018/04/msg00024.html
https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html
https://usn.ubuntu.com/3626-1/
https://www.debian.org/security/2018/dsa-4259

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