Driver-signature bypass via arbitrary zero write
Published Dec 16, 2024 · Updated Dec 16, 2024
Out-of-bounds write in Velocidex WinPmem 4.1 and earlier allows local users with administrator rights to overwrite kernel memory via an IOCTL. The IOCTL_REVERSE_SEARCH_QUERY handler uses METHOD_NEITHER and copies a zero result through a caller-supplied output pointer without rejecting kernel addresses. Administrator access to the pmem device and the driver's memory disclosure are required to locate and clear g_CiOptions, disabling driver-signature enforcement and permitting unsigned driver loading.
Summary
What happened
Out-of-bounds write in Velocidex WinPmem 4.1 and earlier allows local users with administrator rights to overwrite kernel memory via an IOCTL. The IOCTL_REVERSE_SEARCH_QUERY handler uses METHOD_NEITHER and copies a zero result through a caller-supplied output pointer without rejecting kernel addresses. Administrator access to the pmem device and the driver's memory disclosure are required to locate and clear g_CiOptions, disabling driver-signature enforcement and permitting unsigned driver loading.
The record
- CVE
- CVE-2024-12668
- Published
- Dec 16, 2024
- Updated
- Dec 16, 2024
- Vendor
- Velocidex
- Product
- WinPmem
- Classifications
- CWE-787, T1562.004
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Dec 16, 2024CVE publishedPublication date reported by the CVE source.
- Dec 16, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=<= 4.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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