Privilege escalation via SMM handler tampering
Published Mar 23, 2023 · Updated Feb 20, 2025
Privilege escalation in AMD Ryzen and Threadripper firmware allows remote authenticated users to tamper with an AmdCpmOemSmm SMM handler. AMD identifies insufficient control-flow management in AmdCpmOemSmm but has not published the specific flawed operation or input path. Existing privileged access is required, and successful exploitation crosses into SMM to elevate privileges and compromise firmware-protected execution.
Summary
What happened
Privilege escalation in AMD Ryzen and Threadripper firmware allows remote authenticated users to tamper with an AmdCpmOemSmm SMM handler. AMD identifies insufficient control-flow management in AmdCpmOemSmm but has not published the specific flawed operation or input path. Existing privileged access is required, and successful exploitation crosses into SMM to elevate privileges and compromise firmware-protected execution.
The record
- CVE
- CVE-2023-20558
- Published
- Mar 23, 2023
- Updated
- Feb 20, 2025
- Vendor
- AMD
- Product
- 2nd Gen AMD Ryzen Threadripper Processors
- Classifications
- CWE-670, T1068
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 23, 2023CVE publishedPublication date reported by the CVE source.
- Feb 20, 2025Record 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=Various
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
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