Advisory Details

November 10th, 2015

Microsoft Office Word TTF Size Miscalculation Remote Code Execution Vulnerability

ZDI-15-539
ZDI-CAN-3102

CVE ID CVE-2015-6093
CVSS SCORE 6.8, (AV:N/AC:M/Au:N/C:P/I:P/A:P)
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Office Word
TREND MICRO CUSTOMER PROTECTION Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 20732. 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 Word. 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 name tables in an embedded TTF file. Incorrect processing of a size value can cause Word to copy too much data and corrupt memory. An attacker could leverage this vulnerability to execute arbitrary code in the context of the process.

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
  • 2015-07-28 - Vulnerability reported to vendor
  • 2015-11-10 - Coordinated public release of advisory
CREDIT SignalSEC Research
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