Created
October 2, 2019 13:24
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Prototype pollution example
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const u1 = {firstName: 'Foo'} | |
const u2 = {firstName: 'John'} | |
const body = JSON.parse('{"__proto__": {"admin": true}}') | |
function vulnerableExtend(dst, src) { | |
Object.entries(src) | |
.forEach(([k, v]) => { | |
if (k in dst) { | |
vulnerableExtend(dst[k], src[k]); | |
} else { | |
dst[k] = src[k]; | |
} | |
}) | |
} | |
console.log(u1.admin) | |
console.log(u2.admin) | |
vulnerableExtend(u1, body); | |
console.log(u1.admin) | |
console.log(u2.admin) |
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