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{"acknowledgement": "This issue was discovered by Paul Wallrabe (Red Hat).", "affected_release": [{"advisory": "RHSA-2021:4008", "cpe": "cpe:/a:redhat:openshift:4.6::el8", "package": "coreos-installer-0:0.6.0-4.rhaos4.6.el8", "product_name": "Red Hat OpenShift Container Platform 4.6", "release_date": "2021-11-03T00:00:00Z"}, {"advisory": "RHSA-2021:3930", "cpe": "cpe:/a:redhat:openshift:4.7::el8", "package": "coreos-installer-0:0.8.0-4.rhaos4.7.el8", "product_name": "Red Hat OpenShift Container Platform 4.7", "release_date": "2021-10-27T00:00:00Z"}, {"advisory": "RHSA-2021:3926", "cpe": "cpe:/a:redhat:openshift:4.8::el8", "package": "coreos-installer-0:0.9.0-7.rhaos4.8.el8", "product_name": "Red Hat OpenShift Container Platform 4.8", "release_date": "2021-10-27T00:00:00Z"}, {"advisory": "RHSA-2021:3934", "cpe": "cpe:/a:redhat:openshift:4.9::el8", "package": "coreos-installer-0:0.10.1-1.rhaos4.9.el8", "product_name": "Red Hat OpenShift Container Platform 4.9", "release_date": "2021-10-26T00:00:00Z"}], "bugzilla": {"description": "coreos-installer: incorrect signature verification on gzip-compressed install images", "id": "2011862", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2011862"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-347", "details": ["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.", "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."], "name": "CVE-2021-20319", "public_date": "2021-10-07T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-20319\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-20319\nhttps://github.com/coreos/coreos-installer/security/advisories/GHSA-3r3g-g73x-g593"], "statement": "This vulnerability impacts only a specific User-Provisioned Infrastructure (UPI) installation flow where coreos-installer is used and when gzip-compressed images are configured as the installation source. \nBecause this flow does not occur in default usage, Red Hat considers this case as a Moderate impact flaw.", "threat_severity": "Moderate"}