CVE-2021-31728

Severity Score

7.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Un control de acceso incorrecto en las bibliotecas zam64.sys, zam32.sys en MalwareFox AntiMalware versión 2.74.0.150, permite que un proceso no privilegiado abra un identificador para \.\ZemanaAntiMalware, se registre con el controlador mediante el envío de IOCTL 0x80002010, asigne memoria ejecutable usando un fallo en IOCTL 0x80002040, instale un hook con IOCTL 0x80002044 y ejecute la memoria ejecutable usando este hook con IOCTL 0x80002014 o 0x80002018, esto expone la ejecución del código del anillo 0 en el contexto del controlador, permitiendo que al proceso no privilegiado elevar privilegios

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-04-23 CVE Reserved
2021-05-10 First Exploit
2021-05-17 CVE Published
2023-03-08 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CAPEC

References (2)

URL	Tag	Source
https://github.com/irql0/CVE-2021-31728/blob/master/CVE-2021-31728.md	Third Party Advisory

URL	Date	SRC
https://github.com/irql/CVE-2021-31728	2021-05-10

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Malwarefox Search vendor "Malwarefox"		Antimalware Search vendor "Malwarefox" for product "Antimalware"				2.74.0.150 Search vendor "Malwarefox" for product "Antimalware" and version "2.74.0.150"		-		Affected