Advisory Details

August 13th, 2019

Microsoft Windows Font Subsetting Library Double Free Remote Code Execution Vulnerability

ZDI-19-707
ZDI-CAN-7790

CVE ID CVE-2019-1144
CVSS SCORE 7.8, AV:L/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 fontsub.dll. The issue results from the lack of validating the existence of an object prior to performing further free operations on the object. 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-2019-1144
DISCLOSURE TIMELINE
  • 2019-01-25 - Vulnerability reported to vendor
  • 2019-08-13 - Coordinated public release of advisory
CREDIT kdot
BACK TO ADVISORIES