PT-2023-1484 · Amd · Amd Secure Encrypted Virtualization

Published 2023-01-10 · Updated 2025-04-08 · CVE-2021-26403

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Name of the Vulnerable Software and Affected Versions AMD Secure Encrypted Virtualization (SEV) (affected versions not specified)

Description The issue is related to insufficient input validation in the implementation of AMD Secure Encrypted Virtualization (SEV) microcode in AMD processors. This could allow an attacker to gain unauthorized access to protected information. Specifically, insufficient checks in SEV may lead to a malicious hypervisor disclosing the launch secret, potentially resulting in the compromise of VM confidentiality.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Insufficient Verification of Data Authenticity

RCE

Weakness Enumeration

CWE-345

CWE-20

Related Identifiers

BDU:2023-00894

CVE-2021-26403

Affected Products

Amd Secure Encrypted Virtualization

References · 7

• https://amd.com/en/corporate/product-security/bulletin/AMD-SB-1032 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-26403 · Security Note
• https://bdu.fstec.ru/vul/2023-00894 · Security Note
• https://osv.dev/vulnerability/CVE-2021-26403 · Vendor Advisory
• https://support.lenovo.com/us/en/product_security/LEN-87730 · Note
• https://amd.com/en/corporate/product-security/bulletin/amd-sb-1032 · Note
• https://t.me/cvenotify/118377 · Telegram Post