#VU63688 Security features bypass in 3rd Gen AMD EPYC Processors - CVE-2021-26349

Vulnerability identifier: #VU63688

Vulnerability risk: Medium

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-26349

CWE-ID: CWE-254

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
3rd Gen AMD EPYC Processors
Hardware solutions / Firmware

Vendor: AMD

Description

The vulnerability allows an attacker to compromise the guest OS.

The vulnerability exists due to failure to assign a new report ID to an imported guest. This can result in an SEV-SNP guest VM being tricked into trusting a dishonest Migration Agent (MA).

Mitigation
Install updates from vendor's website.

Vulnerable software versions

3rd Gen AMD EPYC Processors: before MilanPI-SP3_1.0.0.7

---

External links
https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1028

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.