CVE-2021-31728 Information

Description

Incorrect access control in zam64.sys zam32.sys in MalwareFox AntiMalware 2.74.0.150 allows a non-privileged process to open a handle to .\ZemanaAntiMalware register itself with the driver by sending IOCTL 0x80002010 allocate executable memory using a flaw in IOCTL 0x80002040 install a hook with IOCTL 0x80002044 and execute the executable memory using this hook with IOCTL 0x80002014 or 0x80002018 this exposes ring 0 code execution in the context of the driver allowing the non-privileged process to elevate privileges.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

https://github.com/irql0/CVE-2021-31728/blob/master/CVE-2021-31728.md

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8