Apache APISIX: the body_schema check in request-validation plugin can be bypassed

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.

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输入验证不恰当

Apache Apisix 输入验证错误漏洞

Apache Apisix是美国阿帕奇（Apache）基金会的一个云原生的微服务API网关服务。该软件基于 OpenResty 和 etcd 来实现，具备动态路由和插件热加载，适合微服务体系下的 API 管理。 Apache Apisix 2.13.0 之前存在输入验证错误漏洞，攻击者可以绕过 request-validation 插件中的 body_schema 验证。

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