Advisory Details

October 11th, 2017

Microsoft Chakra asm.js ArrayBuffer Use-After-Free Remote Code Execution Vulnerability

CVE ID	CVE-2017-11812
CVSS SCORE	7.5, AV:N/AC:L/Au:N/C:P/I:P/A:P
AFFECTED VENDORS	Microsoft
AFFECTED PRODUCTS	Chakra
VULNERABILITY DETAILS	This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Chakra. 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 handling of ArrayBuffer objects in asm.js. By performing actions in JavaScript an attacker can cause a pointer to be reused after it has been freed. 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://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11812
DISCLOSURE TIMELINE	2017-09-01 - Vulnerability reported to vendor 2017-10-11 - Coordinated public release of advisory
CREDIT	Simon Zuckerbraun - Trend Micro Zero Day Initiative

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