cve/2021/CVE-2021-31727.md

CVE-2021-31727

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.

POC

Reference

• https://github.com/irql0/CVE-2021-31728/blob/master/CVE-2021-31727.md

Github

• https://github.com/irql/CVE-2021-31728
• https://github.com/irql0/CVE-2021-31728
• https://github.com/mathisvickie/KMAC