Advisory Details

May 10th, 2017

(Pwn2Own) Microsoft Chakra Array unshift Heap-based Buffer Overflow Remote Code Execution Vulnerability

CVE ID	CVE-2017-0238
CVSS SCORE	6.8, AV:N/AC:M/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 the Array.unshift method. The issue results from the lack of proper validation of an error condition, which can result in an an Array's length not matching the size of the underlying buffer. 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-2017-0238
DISCLOSURE TIMELINE	2017-03-17 - Vulnerability reported to vendor 2017-05-10 - Coordinated public release of advisory
CREDIT	Yuki Chen of Qihoo 360 Vulcan Team

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