Advisory Details

November 20th, 2017

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

ZDI-17-915
ZDI-CAN-5105

CVE ID CVE-2017-11878
CVSS SCORE 5.1, (AV:N/AC:H/Au:N/C:P/I:P/A:P)
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Office Excel
TREND MICRO CUSTOMER PROTECTION Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 29784. For further product information on the TippingPoint IPS: http://www.tippingpoint.com
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.

ADDITIONAL DETAILS Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11878
DISCLOSURE TIMELINE
  • 2017-08-22 - Vulnerability reported to vendor
  • 2017-11-20 - Coordinated public release of advisory
CREDIT Jaanus Kp
Clarified Security
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