Advisory Details

May 15th, 2019

Microsoft Windows Font Subsetting Library Integer Overflow Remote Code Execution Vulnerability

ZDI-19-461
ZDI-CAN-7788

CVE ID CVE-2019-0903
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 vulnerable 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 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 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-2019-0903
DISCLOSURE TIMELINE
  • 2019-01-23 - Vulnerability reported to vendor
  • 2019-05-15 - Coordinated public release of advisory
CREDIT kdot
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