CVE-2022-25757 Information

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\:ad\string_payload\:\good\ can be used to hide the ad\ 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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

https://lists.apache.org/thread/03vd2j81krxmpz6xo8p1dl642flpo6fv http://www.openwall.com/lists/oss-security/2022/03/28/2

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8