Advisory Details

November 10th, 2015

Microsoft Office Excel Binary Worksheet Use-After-Free Remote Code Execution Vulnerability

ZDI-15-546
ZDI-CAN-3270

CVE ID CVE-2015-6094
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 20833. 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 binary Excel files (.xlsb). By providing a malformed file, an attacker can cause a pointer to be re-used after it has been freed. An attacker could leverage this to execute arbitrary code under the context of the current user.

ADDITIONAL DETAILS Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://technet.microsoft.com/library/security/MS15-116
DISCLOSURE TIMELINE
  • 2015-09-08 - Vulnerability reported to vendor
  • 2015-11-10 - Coordinated public release of advisory
CREDIT Steven Seeley of Source Incite
BACK TO ADVISORIES