Headline
CVE-2021-3918: Don't allow __proto__ property to be used for schema default/coerce, … · kriszyp/json-schema@22f1461
json-schema is vulnerable to Improperly Controlled Modification of Object Prototype Attributes (‘Prototype Pollution’)
@@ -92,4 +92,30 @@ var suite = vows.describe(‘JSON Schema’).addBatch({
'Json-Ref self-validates’: assertSelfValidates(‘json-ref’),
'Json-Ref/Hyper’: assertValidates('json-ref’, ‘hyper-schema’),
'Json-Ref/Core’: assertValidates('json-ref’, ‘schema’)*/
prototypePollution: function() {
console.log(‘testing’)
const instance = JSON.parse(`
{
"$schema":{
"type": "object",
"properties":{
"__proto__": {
"type": "object",
"properties":{
"polluted": {
"type": "string",
"default": “polluted”
}
}
}
},
"__proto__": {}
}
}`);
const a = {};
validate(instance);
assert.equal(a.polluted, undefined);
}
}).export(module);
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