Advisory Details

November 20th, 2017

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

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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