TippingPoint Zero Day Initiative

Microsoft Windows JavaScript Spread Operator Uninitialized Memory Information Disclosure Vulnerability

ZDI-17-172: March 21st, 2017


CVSS Score

Affected Vendors

Affected Products


Vulnerability Details

This vulnerability allows remote attackers to disclose sensitive information on vulnerable installations of Microsoft Windows. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the processing of the JavaScript spread operator as implemented in chakra.dll. By performing actions in JavaScript, an attacker can trigger access to memory prior to initialization. An attacker can leverage this vulnerability to disclose sensitive information under the context of the current process.

Vendor Response

Microsoft has issued an update to correct this vulnerability. More details can be found at:

Disclosure Timeline

    2017-01-10 - Vulnerability reported to vendor
    2017-03-21 - Coordinated public release of advisory


This vulnerability was discovered by:
    Simon Zuckerbraun - Trend Micro Zero Day Initiative