TippingPoint Zero Day Initiative

Microsoft Windows Icon File Integer Overflow Remote Code Execution Vulnerability

ZDI-16-645: December 15th, 2016


CVSS Score

Affected Vendors

Affected Products


Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code 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 or folder.

The specific flaw exists within the processing of icon files. The issue results from the lack of proper validation of user-supplied data which can result in an integer overflow before writing to memory. An attacker can leverage this vulnerability to execute arbitrary code 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

    2016-09-27 - Vulnerability reported to vendor
    2016-12-15 - Coordinated public release of advisory


This vulnerability was discovered by:
    Giwan Go of STEALIEN