{
    "CVE_data_meta": {
        "ASSIGNER": "security-advisories@github.com",
        "ID": "CVE-2021-39156",
        "STATE": "PUBLIC",
        "TITLE": "Fragments in Path May Lead to Authorization Policy Bypass"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "istio",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": "< 1.9.8"
                                        },
                                        {
                                            "version_value": ">= 1.10.0, < 1.10.4"
                                        },
                                        {
                                            "version_value": ">= 1.11.0, < 1.11.1"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "istio"
                }
            ]
        }
    },
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "Istio is an open source platform for providing a uniform way to integrate microservices, manage traffic flow across microservices, enforce policies and aggregate telemetry data. Istio 1.11.0, 1.10.3 and below, and 1.9.7 and below contain a remotely exploitable vulnerability where an HTTP request with `#fragment` in the path may bypass Istio’s URI path based authorization policies. Patches are available in Istio 1.11.1, Istio 1.10.4 and Istio 1.9.8. As a work around a Lua filter may be written to normalize the path."
            }
        ]
    },
    "impact": {
        "cvss": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
            "version": "3.1"
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-863: Incorrect Authorization"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "name": "https://github.com/istio/istio/security/advisories/GHSA-hqxw-mm44-gc4r",
                "refsource": "CONFIRM",
                "url": "https://github.com/istio/istio/security/advisories/GHSA-hqxw-mm44-gc4r"
            },
            {
                "name": "https://istio.io/latest/news/security/istio-security-2021-008",
                "refsource": "MISC",
                "url": "https://istio.io/latest/news/security/istio-security-2021-008"
            }
        ]
    },
    "source": {
        "advisory": "GHSA-hqxw-mm44-gc4r",
        "discovery": "UNKNOWN"
    }
}