TippingPoint Zero Day Initiative

Microsoft Edge XAML File Improper Access Control Privilege Escalation Vulnerability

ZDI-17-637: August 8th, 2017


CVSS Score

Affected Vendors

Affected Products


Vulnerability Details

This vulnerability allows remote attackers to escalate privileges on vulnerable installations of Microsoft Edge. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the handling of XAML files. When an XAML file is downloaded, Microsoft Edge does not set appropriate file permissions. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the current user at medium integrity.

Vendor Response

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

Disclosure Timeline

    2017-02-01 - Vulnerability reported to vendor
    2017-08-08 - Coordinated public release of advisory


This vulnerability was discovered by:
    Thomas Vanhoutte