Secure Boot bypass via writable UEFI variables
Published Oct 30, 2023 · Updated Aug 3, 2024
Improper UEFI variable protection in Lenovo ThinkPad BIOS on affected models allows local users to bypass Secure Boot. The firmware leaves security-sensitive UEFI variables inadequately write-protected, permitting privileged modification of boot-trust state. Exploitation requires physical or local access plus elevated privileges; the resulting bypass removes Secure Boot validation of untrusted boot components.
Summary
What happened
Improper UEFI variable protection in Lenovo ThinkPad BIOS on affected models allows local users to bypass Secure Boot. The firmware leaves security-sensitive UEFI variables inadequately write-protected, permitting privileged modification of boot-trust state. Exploitation requires physical or local access plus elevated privileges; the resulting bypass removes Secure Boot validation of untrusted boot components.
The record
- CVE
- CVE-2022-4575
- Published
- Oct 30, 2023
- Updated
- Aug 3, 2024
- Vendor
- Lenovo
- Product
- ThinkPad BIOS
- Classifications
- CWE-276, T1542.001
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Oct 30, 2023CVE 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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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
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Technologies
Your stack
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Your stack
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