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{"acknowledgement": "Red Hat would like to thank the Kubernetes Product Security Committee for reporting this issue. Upstream acknowledges John Howard (Google) as the original reporter.", "affected_release": [{"advisory": "RHSA-2021:2437", "cpe": "cpe:/a:redhat:openshift:4.8::el7", "package": "openshift-0:4.8.0-202107161820.p0.git.051ac4f.assembly.stream.el8", "product_name": "Red Hat OpenShift Container Platform 4.8", "release_date": "2021-07-27T00:00:00Z"}], "bugzilla": {"description": "kubernetes: Holes in EndpointSlice Validation Enable Host Network Hijack", "id": "1954917", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1954917"}, "csaw": false, "cvss3": {"cvss3_base_score": "2.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N", "status": "verified"}, "cwe": "CWE-20", "details": ["A security issue was discovered in Kubernetes where a user may be able to redirect pod traffic to private networks on a Node. Kubernetes already prevents creation of Endpoint IPs in the localhost or link-local range, but the same validation was not performed on EndpointSlice IPs.", "A security issue was discovered in Kubernetes where an authorized user may be able to redirect traffic to private networks on a Node. An untrusted user could exploit this by creating or modifying EndpointSlices to point to localhost or link-local addresses."], "mitigation": {"lang": "en:us", "value": "* Prevent untrusted users from creating or modifying EndpointSlices\n* Creating a validating admission webhook that prevents EndpointSlices with endpoint addresses in the 127.0.0.0/8 and 169.254.0.0/16 ranges"}, "name": "CVE-2021-25737", "package_state": [{"cpe": "cpe:/a:redhat:openshift:3.11", "fix_state": "Not affected", "package_name": "atomic-openshift", "product_name": "Red Hat OpenShift Container Platform 3.11"}], "public_date": "2021-05-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-25737\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-25737\nhttps://github.com/kubernetes/kubernetes/issues/102106\nhttps://groups.google.com/g/kubernetes-security-announce/c/xAiN3924thY"], "statement": "OpenShift Container Platform (OCP) 3.11 is not affected by this vulnerability as it does not support EndpointSlices. All current versions of OCP 4 support EndpointSlices and are therefore affected.", "threat_severity": "Low", "upstream_fix": "kubernetes 1.21.1, kubernetes 1.20.7, kubernetes 1.19.11, kubernetes 1.18.19"}