Firmware memory disclosure via oversized UEFI variable
Published Jun 23, 2023 · Updated Nov 8, 2024
Information disclosure in Dell Client Platform BIOS allows physically proximate attackers to expose firmware memory through a UEFI variable. The Setup DXE module accepts an oversized SiSetup variable, lets GetVariable overwrite DataSize, and passes that length to SetVariable for SiColdReset. Administrator-level firmware access is required; successful exploitation copies stack or global memory into NVRAM for later retrieval.
Summary
What happened
Information disclosure in Dell Client Platform BIOS allows physically proximate attackers to expose firmware memory through a UEFI variable. The Setup DXE module accepts an oversized SiSetup variable, lets GetVariable overwrite DataSize, and passes that length to SetVariable for SiColdReset. Administrator-level firmware access is required; successful exploitation copies stack or global memory into NVRAM for later retrieval.
The record
- CVE
- CVE-2023-28035
- Published
- Jun 23, 2023
- Updated
- Nov 8, 2024
- Vendor
- Dell
- Product
- Dell Client Platform BIOS
- Classifications
- Unavailable
- Attack vector
- physical
- Privileges
- admin
Timeline
How it unfolded
- Jun 23, 2023CVE publishedPublication date reported by the CVE source.
- Nov 8, 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.
Weakness, pattern, technique
No sourced classifications are available.
Public exploit references
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Technologies
Your stack
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Your stack
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