CVE Vulnerability

CVE-2022-46175

JSON5 is an extension to the popular JSON file format that aims to be easier to write and maintain by hand (e.g. for config files). The `parse` method of the JSON5 library before and including versions 1.0.1 and 2.2.1 does not restrict parsing of keys named `__proto__`, allowing specially crafted strings to pollute the prototype of the resulting object. This vulnerability pollutes the prototype of the object returned by `JSON5.parse` and not the global Object prototype, which is the commonly understood definition of Prototype Pollution. However, polluting the prototype of a single object can have significant security impact for an application if the object is later used in trusted operations. This vulnerability could allow an attacker to set arbitrary and unexpected keys on the object returned from `JSON5.parse`. The actual impact will depend on how applications utilize the returned object and how they filter unwanted keys, but could include denial of service, cross-site scripting, elevation of privilege, and in extreme cases, remote code execution. `JSON5.parse` should restrict parsing of `__proto__` keys when parsing JSON strings to objects. As a point of reference, the `JSON.parse` method included in JavaScript ignores `__proto__` keys. Simply changing `JSON5.parse` to `JSON.parse` in the examples above mitigates this vulnerability. This vulnerability is patched in json5 versions 1.0.2, 2.2.2, and later.

8.8 /10

CVSS v3.0 : HIGH

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://github.com/json5/json5/security/advisories/GHSA-9c47-m6qq-7p4h Exploit Third Party Advisory
https://github.com/json5/json5/issues/199 Issue Tracking Patch
https://github.com/json5/json5/issues/295 Issue Tracking Third Party Advisory
https://github.com/json5/json5/pull/298 Patch Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3S26TLPLVFAJTUN3VIXFDEBEXDYO22CE/
Configurations

Configuration 1

cpe:2.3:a:json5:json5:*:*:*:*:*:node.js:*:*
cpe:2.3:a:json5:json5:*:*:*:*:*:node.js:*:*
Information

Published : 2022-12-24 04:15

Updated : 2023-01-30 03:15

NVD link : CVE-2022-46175

Mitre link : CVE-2022-46175

Products Affected
No products.
CWE
CWE-1321

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')