{
    "CVE_data_meta": {
        "ASSIGNER": "security@apache.org",
        "ID": "CVE-2022-25757",
        "STATE": "PUBLIC",
        "TITLE": "Apache APISIX: the body_schema check in request-validation plugin can be bypassed"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Apache APISIX",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<=",
                                            "version_name": "Apache APISIX",
                                            "version_value": "2.12.1"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "Apache Software Foundation"
                }
            ]
        }
    },
    "credit": [
        {
            "lang": "eng",
            "value": "Thanks for Guangli Dong from www.huoxian.cn"
        }
    ],
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In Apache APISIX before 2.13.0, when decoding JSON with duplicate keys, lua-cjson will choose the last occurred value as the result. By passing a JSON with a duplicate key, the attacker can bypass the body_schema validation in the request-validation plugin. For example, `{\"string_payload\":\"bad\",\"string_payload\":\"good\"}` can be used to hide the \"bad\" input. Systems satisfy three conditions below are affected by this attack: 1. use body_schema validation in the request-validation plugin 2. upstream application uses a special JSON library that chooses the first occurred value, like jsoniter or gojay 3. upstream application does not validate the input anymore. The fix in APISIX is to re-encode the validated JSON input back into the request body at the side of APISIX. Improper Input Validation vulnerability in __COMPONENT__ of Apache APISIX allows an attacker to __IMPACT__. This issue affects Apache APISIX Apache APISIX version 2.12.1 and prior versions."
            }
        ]
    },
    "generator": {
        "engine": "Vulnogram 0.0.9"
    },
    "impact": [
        {
            "other": "low"
        }
    ],
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-20 Improper Input Validation"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "refsource": "MISC",
                "url": "https://lists.apache.org/thread/03vd2j81krxmpz6xo8p1dl642flpo6fv",
                "name": "https://lists.apache.org/thread/03vd2j81krxmpz6xo8p1dl642flpo6fv"
            },
            {
                "refsource": "MLIST",
                "name": "[oss-security] 20220328 CVE-2022-25757: Apache APISIX: the body_schema check in request-validation plugin can be bypassed",
                "url": "http://www.openwall.com/lists/oss-security/2022/03/28/2"
            }
        ]
    },
    "source": {
        "discovery": "UNKNOWN"
    },
    "work_around": [
        {
            "lang": "eng",
            "value": "1. upgrade APISIX to 2.13.0 if you need to use the body_schema validation in the request-validation plugin\n2. add additional validation in the application code, embrace defensive programming"
        }
    ]
}