Advisory Details

July 16th, 2020

Microsoft Windows PFB Font File Out-Of-Bounds Write Privilege Escalation Vulnerability

ZDI-20-877
ZDI-CAN-10903

CVE ID CVE-2020-1436
CVSS SCORE 7.8, (AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H)
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Windows
VULNERABILITY DETAILS

This vulnerability allows local attackers to escalate privileges on affected installations of Microsoft Windows. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the parsing of fonts. Crafted data in a font can trigger a write past the end of a heap-based buffer. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of the kernel.

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-2020-1436
DISCLOSURE TIMELINE
  • 2020-05-07 - Vulnerability reported to vendor
  • 2020-07-16 - Coordinated public release of advisory
CREDIT Anonymous
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