Headline
CVE-2022-46175: Prototype Pollution in JSON5 via Parse Method
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 version 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 version 2.2.2 and later.
The parse method of the JSON5 library before and including version 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.
Impact
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.
Mitigation
This vulnerability is patched in json v2.2.2 and later.
Details
Suppose a developer wants to allow users and admins to perform some risky operation, but they want to restrict what non-admins can do. To accomplish this, they accept a JSON blob from the user, parse it using JSON5.parse, confirm that the provided data does not set some sensitive keys, and then performs the risky operation using the validated data:
const JSON5 = require(‘json5’);
const doSomethingDangerous = (props) => { if (props.isAdmin) { console.log(‘Doing dangerous thing as admin.’); } else { console.log(‘Doing dangerous thing as user.’); } };
const secCheckKeysSet = (obj, searchKeys) => { let searchKeyFound = false; Object.keys(obj).forEach((key) => { if (searchKeys.indexOf(key) > -1) { searchKeyFound = true; } }); return searchKeyFound; };
const props = JSON5.parse(‘{"foo": "bar"}’); if (!secCheckKeysSet(props, ['isAdmin’, ‘isMod’])) { doSomethingDangerous(props); // “Doing dangerous thing as user.” } else { throw new Error(‘Forbidden…’); }
If an attacker attempts to set the isAdmin key, their request will be rejected:
const props = JSON5.parse(‘{"foo": "bar", "isAdmin": true}’); if (!secCheckKeysSet(props, ['isAdmin’, ‘isMod’])) { doSomethingDangerous(props); } else { throw new Error(‘Forbidden…’); // Error: Forbidden… }
However, attackers can instead set the proto key to {"isAdmin": true}. JSON5 will parse this key and will set the isAdmin key on the prototype of the returned object, allowing the attacker to bypass the security check and run their request as an admin:
const props = JSON5.parse(‘{"foo": "bar", "__proto__": {"isAdmin": true}}’); if (!secCheckKeysSet(props, ['isAdmin’, ‘isMod’])) { doSomethingDangerous(props); // “Doing dangerous thing as admin.” } else { throw new Error(‘Forbidden…’); }
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The `parse` method of the JSON5 library before and including version `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. ## Impact 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. ## Mitigation This vulnerability is patched in json v2.2.2 and...