Advisory Details

September 12th, 2019

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

ZDI-19-831
ZDI-CAN-8849

CVE ID CVE-2019-1208
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 affected installations of Microsoft Windows. 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 Filter and Join functions in VBScript. By performing actions in VBScript, 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-2019-1208
DISCLOSURE TIMELINE
  • 2019-06-18 - Vulnerability reported to vendor
  • 2019-09-12 - Coordinated public release of advisory
CREDIT Elliot Cao working with Trend Micro's Zero Day Initiative
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