Advisory Details

August 12th, 2014

Microsoft Internet Explorer CSegment Object Use-After-Free Remote Code Execution Vulnerability

CVE ID	CVE-2014-4063
CVSS SCORE	6.8, AV:N/AC:M/Au:N/C:P/I:P/A:P
AFFECTED VENDORS	Microsoft
AFFECTED PRODUCTS	Internet Explorer
TREND MICRO CUSTOMER PROTECTION	Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID ['13753']. 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 Internet Explorer. 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 usage of execCommand("selectAll") and styles which can cause a CSegment object to be freed. The process can be later forced to reuse this pointer resulting in a use-after-free condition. An attacker can leverage this situation to execute code under the context of the user running the browser.
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/MS14-051
DISCLOSURE TIMELINE	2014-03-07 - Vulnerability reported to vendor 2014-08-12 - Coordinated public release of advisory
CREDIT	Anonymous

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