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CVE-2021-31727.md

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Public Reference for CVE-2021-31727

Affected Product: MalwareFox AntiMalware 2.74.0.150
Affected Component: zam64.sys, zam32.sys
Vulnerability Type: Local, incorrect access control
Impact: High, arbitrary ring 0 code execution

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.

A proof of concept for disk read/writing is available at disk_rw/main.c.