Advisory Details

October 13th, 2015

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

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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