What’s Vulnerable › Vulnerabilities

CVE-2018-8780

• Severity: critical (CVSS 9.1 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 10.0% 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-22

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 Dir.open, Dir.new, Dir.entries and Dir.empty? methods do not check NULL characters. When using the corresponding method, unintentional directory traversal may be performed.

Affected products

• Canonical Ubuntu Linux: 14.04, 16.04, 17.10
• Debian Linux: 7.0, 8.0, 9.0
• Ruby: 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/103739
• 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://access.redhat.com/errata/RHSA-2020:0542
• https://access.redhat.com/errata/RHSA-2020:0591
• https://access.redhat.com/errata/RHSA-2020:0663
• https://lists.debian.org/debian-lts-announce/2018/04/msg00023.html
• https://lists.debian.org/debian-lts-announce/2018/04/msg00024.html

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