Advisory Details

August 8th, 2017

Microsoft Chakra eval Integer Overflow Remote Code Execution Vulnerability

ZDI-17-641
ZDI-CAN-4826

CVE ID CVE-2017-8641
CVSS SCORE 6.8, (AV:N/AC:M/Au:N/C:P/I:P/A:P)
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Chakra
TIPPINGPOINT™ IPS CUSTOMER PROTECTION TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 28729. 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 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 JavaScript eval function. The issue results from the lack of proper validation of user-supplied data, which can result in an integer overflow before allocating a 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:
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8641
DISCLOSURE TIMELINE
  • 2017-05-30 - Vulnerability reported to vendor
  • 2017-08-08 - Coordinated public release of advisory
CREDIT wh1ant
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