CVE-2021-31728

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 v3.1

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

CVSS v2.0

7.2 HIGHAV:L/AC:L/Au:N/C:C/I:C/A:C

EPSS

3.40% chance of exploitation in the next 30 days, 88th percentile

Published

2021-05-17

Updated

2024-08-03

Proof-of-concept exploits (2)

• irql/CVE-2021-3172889★ · 2021-05-10
• irql0/CVE-2021-3172889★ · 2021-05-10

References

• CVE Record
• NVD entry

Related

• CVE-2021-31727
• CVE-2021-31737
• CVE-2021-31721
• CVE-2021-31738
• CVE-2021-31703
• CVE-2021-31755