Advisory Details

October 14th, 2014

Microsoft Internet Explorer CElement::DelMarkupPtr Out-Of-Bounds Read Remote Code Execution Vulnerability

CVE ID	CVE-2014-4145
CVSS SCORE	6.8, AV:N/AC:M/Au:N/C:P/I:P/A:P
AFFECTED VENDORS	Microsoft
AFFECTED PRODUCTS	Internet Explorer
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 issue lies in CElement::DelMarkupPtr which expects a CMarkup object at a certain offset. By calling CElement::DelMarkupPtr more than once an attacker can force type confusion that leads to an out-of-bounds read. An attacker can leverage this vulnerability to execute 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/library/security/MS14-051
DISCLOSURE TIMELINE	2014-06-30 - Vulnerability reported to vendor 2014-10-14 - Coordinated public release of advisory
CREDIT	Omair

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