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{"acknowledgement": "Red Hat would like to thank the Istio Product Security Working Group for reporting this issue.", "affected_release": [{"advisory": "RHSA-2021:2085", "cpe": "cpe:/a:redhat:service_mesh:1.1::el8", "package": "servicemesh-0:1.1.15-4.el8", "product_name": "OpenShift Service Mesh 1.1", "release_date": "2021-05-20T00:00:00Z"}, {"advisory": "RHSA-2021:2061", "cpe": "cpe:/a:redhat:service_mesh:2.0::el8", "package": "servicemesh-0:2.0.5-3.el8", "product_name": "OpenShift Service Mesh 2.0", "release_date": "2021-05-20T00:00:00Z"}], "bugzilla": {"description": "istio/istio: authorization bypass when using AUTO_PASSTHROUGH", "id": "1955396", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1955396"}, "csaw": false, "cvss3": {"cvss3_base_score": "10.0", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-863", "details": ["Istio before 1.8.6 and 1.9.x before 1.9.5 contains a remotely exploitable vulnerability where an external client can access unexpected services in the cluster, bypassing authorization checks, when a gateway is configured with AUTO_PASSTHROUGH routing configuration.", "An authorization bypass vulnerability was found in istio. When the istio gateway is configured with TLS mode `AUTO_PASSTHROUGH`, it is possible for a malicious user to bypass the authorization checks and gain access to protected services. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability."], "name": "CVE-2021-31921", "public_date": "2021-05-11T19:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-31921\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-31921\nhttps://istio.io/latest/news/security/istio-security-2021-006/"], "statement": "To determine if a potential istio gateway might be affected by this vulnerability, the same command specified here: https://istio.io/latest/news/security/istio-security-2021-006/ can also be applied to OpenShift ServiceMesh using the `oc` cli instead of `kubectl`:\n$ oc get gateways.networking.istio.io -A -o \"custom-columns=NAMESPACE:.metadata.namespace,NAME:.metadata.name,TLS_MODE:.spec.servers[*].tls.mode\"\nNAMESPACE \u00a0 NAME \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 TLS_MODE\ntest \u00a0 \u00a0test-gateway \u00a0 <none>\nAs specified in the linked reference, if the `TLS_MODE` returned is `AUTO_PASSTHROUGH` then the gateway may be affected.", "threat_severity": "Important", "upstream_fix": "istio/istio 1.9.5, istio/istio 1.8.6"}