Local memory disclosure via compromised boot components
Published May 12, 2022 · Updated Sep 17, 2024
Information disclosure in AMD Ryzen and Athlon Series firmware allows local users to exfiltrate arbitrary ASP bootloader memory. A malicious or compromised UApp or AGESA Boot Loader exfiltrates memory from the ASP stage 2 bootloader, but AMD has not disclosed the faulty operation that permits the read. Exploitation requires control of either boot component on affected hardware, and the disclosed consequence is limited to confidentiality.
Summary
What happened
Information disclosure in AMD Ryzen and Athlon Series firmware allows local users to exfiltrate arbitrary ASP bootloader memory. A malicious or compromised UApp or AGESA Boot Loader exfiltrates memory from the ASP stage 2 bootloader, but AMD has not disclosed the faulty operation that permits the read. Exploitation requires control of either boot component on affected hardware, and the disclosed consequence is limited to confidentiality.
The record
- CVE
- CVE-2021-26361
- Published
- May 12, 2022
- Updated
- Sep 17, 2024
- Vendor
- AMD
- Product
- AMD Ryzen Series
- Classifications
- T1005
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- May 12, 2022CVE publishedPublication date reported by the CVE source.
- Sep 17, 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=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