SMM code execution via unchecked pointer bit write
Published Aug 8, 2023 · Updated Oct 24, 2024
Memory corruption in CpmDisplayFeatureSmm on affected AMD processors allows local users to execute arbitrary code in SMM. The SMM driver insufficiently validates an attacker-controlled pointer before overwriting an arbitrary bit at that address. Local low-privileged access is required, and successful exploitation compromises firmware-level execution beneath the operating system.
Summary
What happened
Memory corruption in CpmDisplayFeatureSmm on affected AMD processors allows local users to execute arbitrary code in SMM. The SMM driver insufficiently validates an attacker-controlled pointer before overwriting an arbitrary bit at that address. Local low-privileged access is required, and successful exploitation compromises firmware-level execution beneath the operating system.
The record
- CVE
- CVE-2023-20555
- Published
- Aug 8, 2023
- Updated
- Oct 24, 2024
- Vendor
- AMD
- Product
- Ryzen 7020 Series Mobile Processors (Mendocino)
- Classifications
- CWE-787, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 8, 2023CVE publishedPublication date reported by the CVE source.
- Oct 24, 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=various
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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Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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