Advisory Details

October 14th, 2014

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

ZDI-14-350
ZDI-CAN-2484

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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