Advisory Details

November 13th, 2019

Microsoft Windows Kernel Type 1 Font Processing Stack-based Buffer Overflow Remote Code Execution Vulnerability

ZDI-19-986
ZDI-CAN-9373

CVE ID CVE-2019-1456
CVSS SCORE 8.6, (AV:L/AC:L/PR:N/UI:R/S:C/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 Type 1 fonts in the Windows kernel. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of SYSTEM.

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-2019-1456
DISCLOSURE TIMELINE
  • 2019-09-05 - Vulnerability reported to vendor
  • 2019-11-13 - Coordinated public release of advisory
CREDIT Hossein Lotfi of Trend Micro Zero Day Initiative
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