{
    "CVE_data_meta": {
        "ASSIGNER": "security-advisories@github.com",
        "ID": "CVE-2020-15237",
        "STATE": "PUBLIC",
        "TITLE": "Timing attack in Shrine"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "shrine",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": "< 3.3.0"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "shrinerb"
                }
            ]
        }
    },
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In Shrine before version 3.3.0, when using the `derivation_endpoint` plugin, it's possible for the attacker to use a timing attack to guess the signature of the derivation URL. The problem has been fixed by comparing sent and calculated signature in constant time, using `Rack::Utils.secure_compare`. Users using the `derivation_endpoint` plugin are urged to upgrade to Shrine 3.3.0 or greater. A possible workaround is provided in the linked advisory."
            }
        ]
    },
    "impact": {
        "cvss": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "{\"CWE-208\":\"Observable Timing Discrepancy\"}"
                    }
                ]
            },
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "{\"CWE-203\":\"Observable Differences in Behavior to Error Inputs\"}"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "name": "https://github.com/shrinerb/shrine/security/advisories/GHSA-5jjv-x4fq-qjwp",
                "refsource": "CONFIRM",
                "url": "https://github.com/shrinerb/shrine/security/advisories/GHSA-5jjv-x4fq-qjwp"
            },
            {
                "name": "https://github.com/shrinerb/shrine/commit/1b27090ce31543bf39f186c20ea47c8250fca2f0",
                "refsource": "MISC",
                "url": "https://github.com/shrinerb/shrine/commit/1b27090ce31543bf39f186c20ea47c8250fca2f0"
            }
        ]
    },
    "source": {
        "advisory": "GHSA-5jjv-x4fq-qjwp",
        "discovery": "UNKNOWN"
    }
}