Vulnerability in Puppet

CVE-2020-7942

Previously, Puppet operated on a model that a node with a valid certificate was entitled to all information in the system and that a compromised certificate allowed access to everything in the infrastructure. When a node's catalog falls back to the `default` node, the catalog can be retrieved for a different node by modifying facts for the Puppet run. This issue can be mitigated by setting `strict_hostname_checking = true` in `puppet.conf` on your Puppet master. Puppet 6.13.0 and 5.5.19 changes the default behavior for strict_hostname_checking from false to true. It is recommended that Puppet Open Source and Puppet Enterprise users that are not upgrading still set strict_hostname_checking to true to ensure secure behavior. Affected software versions: Puppet 6.x prior to 6.13.0 Puppet Agent 6.x prior to 6.13.0 Puppet 5.5.x prior to 5.5.19 Puppet Agent 5.5.x prior to 5.5.19 Resolved in: Puppet 6.13.0 Puppet Agent 6.13.0 Puppet 5.5.19 Puppet Agent 5.5.19

Vulnerability class: Improper Certificate Validation

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.008 (55.9th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 55.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2020-7942: held from 0.008 to 0.008.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: -0.000

Affected products

  • Puppet — versions 5.5.x prior to 5.5.19, Fixed in 5.5.19, 6.x prior to 6.13.0
  • Puppet Agent — versions 5.5.x prior to 5.5.19, Fixed in 5.5.19, 6.x prior to 6.13.0
  • Puppet Agent

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2020-7942?
CVE-2020-7942 is a medium-severity vulnerability in Puppet, classified under Improper Certificate Validation. CVSS score: 6.5/10. Published 2020-02-19.
How severe is CVE-2020-7942?
Medium severity. CVSS v3 base score is 6.5 out of 10.