Local kernel code execution via driver IOCTLs
Published May 17, 2021 · Updated Aug 3, 2024
Incorrect access control in MalwareFox AntiMalware 2.74.0.150 allows local users to elevate privileges via malicious driver IOCTL requests. The zam64.sys and zam32.sys drivers accept unprivileged handle opens and IOCTLs that register a process, allocate executable memory, install a hook, and execute that memory in ring 0. Local users need only a non-privileged process with access to the driver device; successful exploitation yields kernel-level code execution and privilege elevation.
Summary
What happened
Incorrect access control in MalwareFox AntiMalware 2.74.0.150 allows local users to elevate privileges via malicious driver IOCTL requests. The zam64.sys and zam32.sys drivers accept unprivileged handle opens and IOCTLs that register a process, allocate executable memory, install a hook, and execute that memory in ring 0. Local users need only a non-privileged process with access to the driver device; successful exploitation yields kernel-level code execution and privilege elevation.
The record
- CVE
- CVE-2021-31728
- Published
- May 17, 2021
- Updated
- Aug 3, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- May 17, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- CVE-2021-31728 proof-of-conceptproof of concept · unverified
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Reported exploitation
- Terminator tool exploitation of Zemana driver flawreported exploitation
Technologies
Your stack
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Your stack
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