CVE-2021-31727 Information

Description

Incorrect access control in zam64.sys zam32.sys in MalwareFox AntiMalware 2.74.0.150 where IOCTL’s 0x80002014 0x80002018 expose unrestricted disk read/write capabilities respectively. A non-privileged process can open a handle to .\ZemanaAntiMalware register with the driver using IOCTL 0x80002010 and send these IOCTL’s to escalate privileges by overwriting the boot sector or overwriting critical code in the pagefile.

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-2021-31727.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