Advisory Details

October 13th, 2015

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

ZDI-15-516
ZDI-CAN-3038

CVE ID CVE-2015-2558
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 20297. 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 parsing of the fileVersion element in the workbook. By providing an overly long value, an attacker can force an object to be used after it has been freed. This could allow the attacker 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://technet.microsoft.com/en-us/library/security/MS15-110
DISCLOSURE TIMELINE
  • 2015-07-02 - Vulnerability reported to vendor
  • 2015-10-13 - Coordinated public release of advisory
CREDIT 3S Labs
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