Advisory Details

September 15th, 2017

Microsoft Office Excel xlsb File Heap-based Buffer Overflow Remote Code Execution Vulnerability

ZDI-17-727
ZDI-CAN-4795

CVE ID CVE-2017-8631
CVSS SCORE 6.8, AV:N/AC:M/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 ['29599']. 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 processing of Excel Binary files. Crafted data within an xlsb file can trigger an overflow of a heap-based buffer. An attacker can leverage this vulnerability to execute arbitrary code under the context of the current 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-2017-8631
DISCLOSURE TIMELINE
  • 2017-05-05 - Vulnerability reported to vendor
  • 2017-09-15 - Coordinated public release of advisory
CREDIT Steven Seeley (mr_me) of Offensive Security
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