Advisory Details

October 14th, 2014

Microsoft Word Style Tag Use-After-Free Remote Code Execution Vulnerability

CVE ID	CVE-2014-4117
CVSS SCORE	6.8, AV:N/AC:M/Au:N/C:P/I:P/A:P
AFFECTED VENDORS	Microsoft
AFFECTED PRODUCTS	Office Word
VULNERABILITY DETAILS	This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft 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 parsing of style tags. By nesting a specific style tag within another, an attacker is able to cause a pointer to be used after the underlying object has been freed. This could be used to execute arbitrary code in 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/en-us/library/security/MS14-061
DISCLOSURE TIMELINE	2014-08-04 - Vulnerability reported to vendor 2014-10-14 - Coordinated public release of advisory
CREDIT	3S Labs

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