Vulnerability in Malwarefox Antimalware
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.034 (88.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 88.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.034 · newest: 0.034 · change: 0.000
Affected products
- Malwarefox Antimalware — versions 2.74.0.150
Public proof-of-concept exploits
References
- github.com/irql0/CVE-2021-31728/blob/master/CVE-2021-31728.md (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-31728?
- CVE-2021-31728 is a high-severity vulnerability in Malwarefox Antimalware. CVSS score: 7.8/10. Published 2021-05-17.
- How severe is CVE-2021-31728?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2021-31728 known to be exploited?
- 14 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.