Advisory Details

July 10th, 2019

Microsoft Windows gdiplus Font Parsing Integer Underflow Remote Code Execution Vulnerability

ZDI-19-646
ZDI-CAN-8050

CVE ID CVE-2019-1098
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 the parsing of font files in the gdiplus library. The issue results from the lack of proper validation of user-supplied data, which can result in an integer underflow before writing to memory. 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-2019-1098
DISCLOSURE TIMELINE
  • 2019-03-29 - Vulnerability reported to vendor
  • 2019-07-10 - Coordinated public release of advisory
CREDIT kdot
BACK TO ADVISORIES