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TI-2021-03608 Aliases CVE-2021-20319GHSA-3r3g-g73x-g593

Improper signature verification in coreos-installer

Priority LOW 35CWE-347Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-347.

Summary

An improper signature verification vulnerability was found in coreos-installer. A specially crafted gzip installation image can bypass the image signature verification and as a consequence can lead to the installation of unsigned content. An attacker able to modify the original installation image can write arbitrary data, and achieve full access to the node being installed.

Why it matters now

EPSS 0.00519 44th percentileScored 2026-11-07
Fix Fixed coreos-installer (crates.io): 0.10.1Red Hat: 5 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
—coreos-installerAffects coreos-installer before v0.10.1, Fixed in v0.10.1.—No fix listedCNA
—coreos-installer (crates.io)before 0.10.10.10.1Patch availableGHSA-3r3g-g73x-g593
  • coreos-installer Vendor— Affected Affects coreos-installer before v0.10.1, Fixed in v0.10.1. Fixed in — No fix listed CNA
  • coreos-installer (crates.io) Vendor— Affected before 0.10.1 Fixed in 0.10.1 Patch available GHSA-3r3g-g73x-g593

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:redhat:coreos-installer:*:*:*:*:*:*:*:*before 0.10.1VulnerableRed Hat
  • cpe:2.3:a:redhat:coreos-installer:*:*:*:*:*:*:*:* Versions before 0.10.1 Vulnerable ·Red Hat

Remediation

  • Fix · GHSA-3r3g-g73x-g593 coreos-installer (crates.io) Fixed in 0.10.1 Advisory →

Red Hat 5 advisories

  • RHSA-2022:0055 Released 2022-03-10 · Red Hat rating Moderate
    OpenShift Container Platform 4.10.3 bug fix and security update
    • Red Hat OpenShift Container Platform 4.10 coreos-installer-0.12.0-1.rhaos4.10.el8, coreos-installer-bootinfra-0.12.0-1.rhaos4.10.el8, cri-o-1.23.0-92.rhaos4.10.gitdaab4d1.el7 +11
  • RHSA-2021:4008 Released 2021-11-03 · Red Hat rating Moderate
    OpenShift Container Platform 4.6.49 security update
    • Red Hat OpenShift Container Platform 4.6 coreos-installer-0.6.0-4.rhaos4.6.el8, coreos-installer-bootinfra-0.6.0-4.rhaos4.6.el8
  • RHSA-2021:3930 Released 2021-10-27 · Red Hat rating Moderate
    OpenShift Container Platform 4.7.36 security and bug fix update
    • Red Hat OpenShift Container Platform 4.7 coreos-installer-0.8.0-4.rhaos4.7.el8, coreos-installer-bootinfra-0.8.0-4.rhaos4.7.el8
Show 2 more Red Hat advisories
  • RHSA-2021:3926 Released 2021-10-27 · Red Hat rating Moderate
    OpenShift Container Platform 4.8.17 security and bug fix update
    • Red Hat OpenShift Container Platform 4.8 coreos-installer-0.9.0-7.rhaos4.8.el8, coreos-installer-bootinfra-0.9.0-7.rhaos4.8.el8
  • RHSA-2021:3934 Released 2021-10-26 · Red Hat rating Moderate
    OpenShift Container Platform 4.9.4 packages and security update
    • Red Hat OpenShift Container Platform 4.9 coreos-installer-0.10.1-1.rhaos4.9.el8, coreos-installer-bootinfra-0.10.1-1.rhaos4.9.el8

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat OpenShift Container Platform 4.10Fixed RHSA-2022:0055
Red Hat OpenShift Container Platform 4.6Fixed RHSA-2021:4008
Red Hat OpenShift Container Platform 4.7Fixed RHSA-2021:3930
Red Hat OpenShift Container Platform 4.8Fixed RHSA-2021:3926
Red Hat OpenShift Container Platform 4.9Fixed RHSA-2021:3934
Not affected: 5 products
  • Red Hat OpenShift Container Platform 4.10
  • Red Hat OpenShift Container Platform 4.6
  • Red Hat OpenShift Container Platform 4.7
  • Red Hat OpenShift Container Platform 4.8
  • Red Hat OpenShift Container Platform 4.9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-20319
  2. 2026-10-03 Alias added: GHSA-3r3g-g73x-g593

References

Patch 1

Advisory 3

Other 3

  • TI-2021-02826 Incorrect default permissions in coreos-installer CVSS 3.1MEDIUM 5.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences