TippingPoint Zero Day Initiative
 

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

ZDI-17-327: May 10th, 2017

CVE ID

CVSS Score

Affected Vendors

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.

Vendor Response

Microsoft has issued an update to correct this vulnerability. More details can be found at:

Disclosure Timeline

    2017-03-17 - Vulnerability reported to vendor
    2017-05-10 - Coordinated public release of advisory

Credit

This vulnerability was discovered by:
    Yuki Chen of Qihoo 360 Vulcan Team