TippingPoint Zero Day Initiative
 

Microsoft Office Excel Workbook Use-After-Free Remote Code Execution Vulnerability

ZDI-17-915: November 20th, 2017

CVE ID

CVSS Score

Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 29784. For further product information on the TippingPoint IPS:

Vulnerability Details


This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Office Excel. 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 Excel workbooks. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code under the context of the process.

Vendor Response

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

Disclosure Timeline

    2017-08-22 - Vulnerability reported to vendor
    2017-11-20 - Coordinated public release of advisory

Credit

This vulnerability was discovered by:
    Jaanus Kp
    Clarified Security