Firmware memory disclosure via oversized UEFI variable
Published Jun 23, 2023 · Updated Nov 7, 2024
Improper input validation in Dell Client Platform BIOS allows local administrators to disclose firmware memory through a crafted UEFI variable. A DXE module reuses the PchSetup DataSize value returned by GetVariable when SetVariable writes a fixed 2,028-byte buffer, copying excess stack or global memory into NVRAM. Exploitation requires high-privilege local or physical access; the disclosed memory can assist a separate memory-corruption attack, while this flaw alone does not execute code.
Summary
What happened
Improper input validation in Dell Client Platform BIOS allows local administrators to disclose firmware memory through a crafted UEFI variable. A DXE module reuses the PchSetup DataSize value returned by GetVariable when SetVariable writes a fixed 2,028-byte buffer, copying excess stack or global memory into NVRAM. Exploitation requires high-privilege local or physical access; the disclosed memory can assist a separate memory-corruption attack, while this flaw alone does not execute code.
The record
- CVE
- CVE-2023-28050
- Published
- Jun 23, 2023
- Updated
- Nov 7, 2024
- Vendor
- Dell
- Product
- Dell Client Platform BIOS
- Classifications
- CWE-20, T1005
- 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
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=All Versions
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo