Code execution via unvalidated DMA copy syscalls
Published May 9, 2023 · Updated Jan 28, 2025
Insufficient input validation in the ASP Bootloader on 2nd and 3rd Gen AMD EPYC processors allows attackers to execute code. The bootloader accepts syscall inputs without sufficient validation and uses them to direct arbitrary DMA copies. Exploitation requires privileged access to invoke the affected syscall and can place attacker-controlled code into executable memory.
Summary
What happened
Insufficient input validation in the ASP Bootloader on 2nd and 3rd Gen AMD EPYC processors allows attackers to execute code. The bootloader accepts syscall inputs without sufficient validation and uses them to direct arbitrary DMA copies. Exploitation requires privileged access to invoke the affected syscall and can place attacker-controlled code into executable memory.
The record
- CVE
- CVE-2021-46769
- Published
- May 9, 2023
- Updated
- Jan 28, 2025
- Vendor
- Advanced Micro Devices, Inc.
- Product
- 3rd Gen AMD EPYC Processors
- Classifications
- CWE-20
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 9, 2023CVE publishedPublication date reported by the CVE source.
- Jan 28, 2025Record 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=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
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Technologies
Your stack
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Your stack
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