{"id":"CVE-2022-25757","state":"PUBLISHED","title":"Apache APISIX: the body_schema check in request-validation plugin can be bypassed","description":"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.","publishedAt":"2022-03-28T07:00:16.000Z","updatedAt":"2024-08-03T04:49:43.256Z","severity":null,"assigner":"apache","products":["Apache Software Foundation Apache APISIX"],"affected":[{"vendor":"Apache Software Foundation","product":"Apache APISIX","versions":[{"version":"Apache APISIX","status":"affected","lessThanOrEqual":"2.12.1","versionType":"custom"}]}],"references":["https://lists.apache.org/thread/03vd2j81krxmpz6xo8p1dl642flpo6fv","http://www.openwall.com/lists/oss-security/2022/03/28/2"],"weaknesses":["CWE-20"],"ingestedAt":"2026-10-29T19:49:46.971Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/25xxx/CVE-2022-25757.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2022-25757","state":"PUBLISHED","datePublished":"2022-03-28T07:00:16.000Z","dateUpdated":"2024-08-03T04:49:43.256Z","assignerShortName":"apache","assignerOrgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09","dateReserved":"2022-02-22T00:00:00.000Z"},"containers":{"cna":{"title":"Apache APISIX: the body_schema check in request-validation plugin can be bypassed","descriptions":[{"lang":"en","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."}],"affected":[{"vendor":"Apache Software Foundation","product":"Apache APISIX","versions":[{"version":"Apache APISIX","status":"affected","lessThanOrEqual":"2.12.1","versionType":"custom"}]}],"references":[{"url":"https://lists.apache.org/thread/03vd2j81krxmpz6xo8p1dl642flpo6fv","tags":["x_refsource_MISC"]},{"url":"http://www.openwall.com/lists/oss-security/2022/03/28/2","name":"[oss-security] 20220328 CVE-2022-25757: Apache APISIX: the body_schema check in request-validation plugin can be bypassed","tags":["mailing-list","x_refsource_MLIST"]}],"metrics":[{"other":{"content":{"other":"low"},"type":"unknown"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-20","description":"CWE-20 Improper Input Validation","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"apache","dateUpdated":"2022-03-28T11:06:08.000Z","orgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09"},"credits":[{"lang":"en","value":"Thanks for Guangli Dong from www.huoxian.cn"}],"source":{"discovery":"UNKNOWN"},"workarounds":[{"lang":"en","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"}],"x_generator":{"engine":"Vulnogram 0.0.9"},"x_legacyV4Record":{"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__. 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