TippingPoint Zero Day Initiative

(Pwn2Own) Microsoft Edge AudioBuffer Use-After-Free Information Disclosure Vulnerability

ZDI-17-328: May 10th, 2017


CVSS Score

Affected Vendors

Affected Products


Vulnerability Details

This vulnerability allows remote attackers to disclose sensitive information on vulnerable installations of Microsoft Edge. 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 handling of AudioBuffer objects. By performing actions in JavaScript an attacker can cause a pointer to be reused after it has been freed. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in 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

    2017-03-15 - Vulnerability reported to vendor
    2017-05-10 - Coordinated public release of advisory


This vulnerability was discovered by:
    Richard Zhu (fluorescence)