Advisory Details

August 14th, 2018

Microsoft Windows VBScript Array Use-After-Free Remote Code Execution Vulnerability

ZDI-18-953
ZDI-CAN-6776

CVE ID CVE-2018-8373
CVSS SCORE 8.8, AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Windows
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Windows VBScript. 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 arrays. By performing actions in script, an attacker can cause a pointer to be reused after it has been freed. An attacker can leverage this vulnerability to execute code in 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-2018-8373
DISCLOSURE TIMELINE
  • 2018-07-13 - Vulnerability reported to vendor
  • 2018-08-14 - Coordinated public release of advisory
CREDIT Elliot Cao of Trend Micro Security Research
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