TippingPoint Zero Day Initiative
 

Microsoft Windows OTL Font Parsing Out-Of-Bounds Read Information Disclosure Vulnerability

ZDI-17-409: June 13th, 2017

CVE ID

CVSS Score

Affected Vendors

Affected Products

    Windows

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 OpenType Layout (OTL) data in font files. The issue results from the lack of proper validation of user-supplied data, which can result in a read outside an allocated object. 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

    2017-05-04 - Vulnerability reported to vendor
    2017-06-13 - Coordinated public release of advisory

Credit

This vulnerability was discovered by:
    Ke Liu of Tencent's Xuanwu LAB