Firmware memory disclosure via unchecked NVRAM write
Published Jun 23, 2023 · Updated Nov 7, 2024
Improper input validation in Dell Client Platform BIOS allows local users with administrator privileges to expose memory through a UEFI variable. A DXE driver passes a DataSize value overwritten by GetVariable to SetVariable without resetting it, copying stack or global memory into NVRAM. Administrator-level access to an affected device is required; the disclosure can assist a separate firmware exploit, but direct code execution is not established.
Summary
What happened
Improper input validation in Dell Client Platform BIOS allows local users with administrator privileges to expose memory through a UEFI variable. A DXE driver passes a DataSize value overwritten by GetVariable to SetVariable without resetting it, copying stack or global memory into NVRAM. Administrator-level access to an affected device is required; the disclosure can assist a separate firmware exploit, but direct code execution is not established.
The record
- CVE
- CVE-2023-28058
- Published
- Jun 23, 2023
- Updated
- Nov 7, 2024
- Vendor
- Dell
- Product
- Dell Client Platform BIOS
- Classifications
- CWE-20, T1542.001
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Jun 23, 2023CVE publishedPublication date reported by the CVE source.
- Nov 7, 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=All Versions
What conditions does exploitation require?
What is affected?
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.
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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