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.
History

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cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published: 2022-03-28T07:00:16

Updated: 2024-08-03T04:49:43.256Z

Reserved: 2022-02-22T00:00:00

Link: CVE-2022-25757

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2022-03-28T07:15:06.730

Modified: 2022-04-04T17:22:20.703

Link: CVE-2022-25757

cve-icon Redhat

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