Advisory Details

November 10th, 2015

Microsoft Office Excel Binary Worksheet Uninitialized Pointer Remote Code Execution Vulnerability

ZDI-15-543
ZDI-CAN-3109

CVE ID CVE-2015-6038
CVSS SCORE 6.8, (AV:N/AC:M/Au:N/C:P/I:P/A:P)
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Office Excel
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 (.xlsb) Excel files. By providing a malformed .xlsb file, an attacker can cause the target location for a branch to be read from uninitialized memory. An attacker could leverage this to execute arbitrary code under the context of the Excel process.

VENDOR RESPONSE 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
  • 2015-08-03 - Vulnerability reported to vendor
  • 2015-11-10 - Coordinated public release of advisory
CREDIT Steven Seeley of Source Incite
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